{"title":"Trailer Parts","description":"\u003cp\u003eShop replacement parts for semi-trailers, including parts for Great Dane, Utility, Wabash, and more. Check individual product details for fitment and compatibility.\u003c\/p\u003e","products":[{"product_id":"hendrickson-s-28929-heavy-duty-air-spring","title":"Hendrickson S-28929 | Heavy-Duty Air Spring","description":"\u003ch2\u003eHendrickson S-28929 Heavy-Duty Air Spring for Commercial Trailer Air Suspensions\u003c\/h2\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eHendrickson S-28929 Heavy-Duty Air Spring\u003c\/strong\u003e is a genuine OEM replacement air suspension spring engineered specifically for Hendrickson trailer suspension systems. Designed to restore proper ride height, suspension performance, and load support, the S-28929 delivers exceptional durability and ride quality for commercial trailers operating in demanding highway and vocational applications.\n\u003c\/p\u003e\n\n\u003cp\u003e\nManufactured and validated by Hendrickson, this premium air spring utilizes a low-frequency design that improves ride quality while helping reduce vibration, suspension wear, and maintenance costs. Built with premium rubber compounds and engineered piston technology, the S-28929 provides long-lasting performance for fleets, owner-operators, and trailer repair facilities.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe Hendrickson S-28929 is commonly used on \u003cstrong\u003eVANTRAAX® HKANT 40K trailer suspension systems manufactured after January 2008.\u003c\/strong\u003e Always verify your suspension model before ordering.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eGenuine Hendrickson OEM air spring\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for Hendrickson trailer suspensions\u003c\/li\u003e\n\u003cli\u003eRestores proper ride height and suspension performance\u003c\/li\u003e\n\u003cli\u003ePremium heavy-duty rubber construction\u003c\/li\u003e\n\u003cli\u003eLow-frequency design improves ride quality\u003c\/li\u003e\n\u003cli\u003eExcellent resistance to harsh road conditions\u003c\/li\u003e\n\u003cli\u003eOEM fit, function, and reliability\u003c\/li\u003e\n\u003cli\u003eIdeal for commercial fleets and owner-operators\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Hendrickson\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e S-28929\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Heavy-Duty Air Spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuspension Type:\u003c\/strong\u003e Trailer Air Suspension\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eVerified Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eHendrickson VANTRAAX® HKANT 40K Trailer Suspension (January 2008 and newer)\u003c\/li\u003e\n\u003cli\u003eCommercial Dry Van Trailers\u003c\/li\u003e\n\u003cli\u003eRefrigerated Trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed Trailers\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Air Ride Trailer Suspensions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Hendrickson advises that the newer S-28929 air spring should \u003cstrong\u003enot\u003c\/strong\u003e be mixed with the earlier S-22948 design on the same suspension. Replace both air springs together when converting from the older design. This helps maintain proper suspension performance and prevents premature wear.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eVerified Cross Reference Part Numbers\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eHendrickson C-28929\u003c\/li\u003e\n\u003cli\u003eHendrickson S-28929-48\u003c\/li\u003e\n\u003cli\u003eFirestone W01-358-9978\u003c\/li\u003e\n\u003cli\u003eFirestone 1T15M-4\u003c\/li\u003e\n\u003cli\u003eContiTech AS9978\u003c\/li\u003e\n\u003cli\u003eContiTech 67588\u003c\/li\u003e\n\u003cli\u003eGoodyear 1R12-668\u003c\/li\u003e\n\u003cli\u003eGoodyear 1R12-1179\u003c\/li\u003e\n\u003cli\u003eMeritor FS9978\u003c\/li\u003e\n\u003cli\u003eWorld American WA01-9978C\u003c\/li\u003e\n\u003cli\u003eAutomann MHSK485\u003c\/li\u003e\n\u003cli\u003eTriangle AS8959\u003c\/li\u003e\n\u003cli\u003eTorque TR9978\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eAlways verify your VIN, suspension model, or existing air spring before ordering to ensure proper fitment.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Restores factory ride quality\u003c\/li\u003e\n\u003cli\u003e✔ Reduces vibration and road shock\u003c\/li\u003e\n\u003cli\u003e✔ Supports proper trailer ride height\u003c\/li\u003e\n\u003cli\u003e✔ Improves suspension stability\u003c\/li\u003e\n\u003cli\u003e✔ Helps extend suspension component life\u003c\/li\u003e\n\u003cli\u003e✔ OEM-engineered for maximum durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Choose Genuine Hendrickson Air Springs?\u003c\/h3\u003e\n\n\u003cp\u003e\nHendrickson engineers its air springs as part of a complete suspension system—not as universal replacements. Genuine Hendrickson air springs are designed, tested, and validated to deliver the correct spring rate, ride height, and durability for your specific suspension, helping maximize uptime and reduce long-term maintenance costs.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#f8f8f8;padding:25px;border-left:4px solid #ff6a00;margin:25px 0;\"\u003e\n\u003ch3\u003e🔧 Complete Your Suspension Service\u003c\/h3\u003e\n\n\u003cp\u003eRestore your trailer suspension with premium replacement components for maximum reliability and ride quality.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003e✔ Shock Absorbers\u003c\/li\u003e\n\u003cli\u003e✔ Height Control Valves\u003c\/li\u003e\n\u003cli\u003e✔ Suspension Bushings\u003c\/li\u003e\n\u003cli\u003e✔ Torque Rods\u003c\/li\u003e\n\u003cli\u003e✔ Air Brake Components\u003c\/li\u003e\n\u003cli\u003e✔ Wheel Bearings \u0026amp; Seals\u003c\/li\u003e\n\u003cli\u003e✔ Preventive Maintenance Supplies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#fff7ef;padding:20px;border:1px solid #ffb366;border-radius:8px;\"\u003e\n\u003ch3\u003e🚛 Frequently Purchased Together\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ ATRO Suspension Bushings\u003c\/li\u003e\n\u003cli\u003e✔ ContiTech Air Springs\u003c\/li\u003e\n\u003cli\u003e✔ Shock Absorbers\u003c\/li\u003e\n\u003cli\u003e✔ Air Brake Parts\u003c\/li\u003e\n\u003cli\u003e✔ Wheel Seals\u003c\/li\u003e\n\u003cli\u003e✔ Hub Components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKeep your trailer operating at peak performance with premium suspension and wheel-end components trusted by commercial fleets and professional technicians.\u003c\/strong\u003e\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Hendrickson","offers":[{"title":"Default Title","offer_id":44890961248301,"sku":"S-28929","price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/hendrickson-s-28929-air-spring-heavy-duty-suspension-bagair-springshendricksonperformance-diesel-groups-28929-8895702.jpg?v=1782860889"},{"product_id":"rev-hd-r1-t03-trailer-wheel-seal","title":"REV HD R1-T03 Trailer Wheel Seal | TN Spindle","description":"\u003ch2\u003eREV HD R1-T03 REV-1 Trailer Wheel Seal | TN Spindle | Severe Duty Wheel End Seal\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eREV HD R1-T03 REV-1 Trailer Wheel Seal\u003c\/strong\u003e is a premium severe-duty wheel seal engineered for commercial trailer axles with TN (Tapered Narrow) spindles. Designed to protect trailer wheel bearings from dirt, water, road debris, and lubricant loss, the R1-T03 delivers exceptional sealing performance for dry vans, refrigerated trailers, flatbeds, tank trailers, and vocational equipment.\u003c\/p\u003e\n\u003cp\u003eBuilt with REV HD's innovative \u003cstrong\u003eFlex Seal™ Technology\u003c\/strong\u003e, the R1-T03 helps reduce installation errors by allowing the seal to flex during hub installation, significantly reducing the chance of cocked seals—the leading cause of premature wheel seal failure. The heavy-duty steel construction, wider sealing surfaces, and multiple internal sealing lips provide superior durability in even the harshest operating environments. :contentReference[oaicite:0]{index=0}\u003c\/p\u003e\n\u003cp\u003eWhether you're servicing a fleet trailer or performing preventive wheel-end maintenance, the REV HD R1-T03 provides OEM-quality performance that helps maximize bearing life, reduce downtime, and lower maintenance costs.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePremium REV HD REV-1 severe-duty trailer wheel seal\u003c\/li\u003e\n\u003cli\u003eDesigned for TN (Tapered Narrow) trailer spindles\u003c\/li\u003e\n\u003cli\u003eCompatible with both oil and grease lubricated hubs\u003c\/li\u003e\n\u003cli\u003eExclusive Flex Seal™ design helps prevent cocked installation\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel top plate protects against installation damage and brake heat\u003c\/li\u003e\n\u003cli\u003eWider inside and outside sealing surfaces for improved coverage\u003c\/li\u003e\n\u003cli\u003eMultiple internal sealing lips for maximum contamination protection\u003c\/li\u003e\n\u003cli\u003eIncludes complimentary Seal Extend installation compound\u003c\/li\u003e\n\u003cli\u003eBuilt for on-highway, off-road, and severe-duty applications\u003c\/li\u003e\n\u003cli\u003e1-Year REV HD warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e REV HD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e R1-T03\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Line:\u003c\/strong\u003e REV-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Trailer Wheel Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle Type:\u003c\/strong\u003e TN (Tapered Narrow)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 6.000\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter:\u003c\/strong\u003e 4.625\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication:\u003c\/strong\u003e Oil or Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Material:\u003c\/strong\u003e Premium NBR Elastomer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 Year\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eMajor Cross Reference Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSKF \/ CR 46300\u003c\/li\u003e\n\u003cli\u003eSKF \/ CR 46304\u003c\/li\u003e\n\u003cli\u003eSKF \/ CR 46305\u003c\/li\u003e\n\u003cli\u003eSKF \/ CR 46306\u003c\/li\u003e\n\u003cli\u003eSKF \/ CR 46308\u003c\/li\u003e\n\u003cli\u003eNational 370025A\u003c\/li\u003e\n\u003cli\u003eNational 380025A\u003c\/li\u003e\n\u003cli\u003eNational 455211\u003c\/li\u003e\n\u003cli\u003eStemco 373-0143\u003c\/li\u003e\n\u003cli\u003eStemco 373-0243\u003c\/li\u003e\n\u003cli\u003eStemco 372-7097\u003c\/li\u003e\n\u003cli\u003eStemco 307-0743\u003c\/li\u003e\n\u003cli\u003eConMet 10005436\u003c\/li\u003e\n\u003cli\u003eConMet 10045888\u003c\/li\u003e\n\u003cli\u003eMeritor A1205G2191\u003c\/li\u003e\n\u003cli\u003eMeritor A1205R2566\u003c\/li\u003e\n\u003cli\u003eMeritor A1205X1662\u003c\/li\u003e\n\u003cli\u003eMeritor A1205C2343\u003c\/li\u003e\n\u003cli\u003eDexter 1005503\u003c\/li\u003e\n\u003cli\u003eGreat Dane 42478\u003c\/li\u003e\n\u003cli\u003eHendrickson A-11571\u003c\/li\u003e\n\u003cli\u003eHendrickson A-25540\u003c\/li\u003e\n\u003cli\u003eREV HD R1-T03\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDry Van Trailers\u003c\/li\u003e\n\u003cli\u003eRefrigerated (Reefer) Trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed Trailers\u003c\/li\u003e\n\u003cli\u003eTank Trailers\u003c\/li\u003e\n\u003cli\u003eUtility Trailers\u003c\/li\u003e\n\u003cli\u003eGreat Dane Trailers\u003c\/li\u003e\n\u003cli\u003eWabash Trailers\u003c\/li\u003e\n\u003cli\u003eHyundai Translead Trailers\u003c\/li\u003e\n\u003cli\u003eVanguard Trailers\u003c\/li\u003e\n\u003cli\u003eWilson Trailers\u003c\/li\u003e\n\u003cli\u003eTimpte Trailers\u003c\/li\u003e\n\u003cli\u003eTrailmobile Trailers\u003c\/li\u003e\n\u003cli\u003eFontaine Trailers\u003c\/li\u003e\n\u003cli\u003eMost North American TN-Spindle Trailer Hubs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eWhy Replace Your Trailer Wheel Seal?\u003c\/h3\u003e\n\u003cp\u003eA leaking wheel seal can contaminate brake linings, damage wheel bearings, and allow moisture and debris into the hub assembly. Replacing worn seals during wheel bearing service helps maintain proper lubrication, extend bearing life, improve braking performance, and reduce costly roadside breakdowns.\u003c\/p\u003e\n\u003chr\u003e\n\u003cdiv style=\"background: #f8f8f8; padding: 25px; border-left: 4px solid #ff6a00; margin: 25px 0;\"\u003e\n\u003ch3\u003e🔥Complete Your Trailer Wheel End Service\u003c\/h3\u003e\n\u003cp\u003eProtect your trailer investment by replacing wheel seals, bearings, hub caps, hub oil, and spindle hardware together. A complete wheel-end service minimizes downtime, reduces maintenance costs, and helps keep your trailers safely on the road.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e✔ Severe-Duty Construction\u003c\/li\u003e\n\u003cli\u003e✔ TN Spindle Design\u003c\/li\u003e\n\u003cli\u003e✔ Oil \u0026amp; Grease Compatible\u003c\/li\u003e\n\u003cli\u003e✔ Flex Seal™ Technology\u003c\/li\u003e\n\u003cli\u003e✔ Premium Wheel Bearing Protection\u003c\/li\u003e\n\u003cli\u003e✔ Fleet-Proven Reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003cdiv style=\"background: #fff7ef; padding: 20px; border: 1px solid #ffb366; border-radius: 8px; margin-top: 20px;\"\u003e\n\u003ch3\u003e🚛 Frequently Purchased Together\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✔ Trailer Wheel Bearing Kits\u003c\/li\u003e\n\u003cli\u003e✔ Hub Oil\u003c\/li\u003e\n\u003cli\u003e✔ Trailer Hub Caps\u003c\/li\u003e\n\u003cli\u003e✔ Spindle Nut Kits\u003c\/li\u003e\n\u003cli\u003e✔ Brake Drums \u0026amp; Brake Shoes\u003c\/li\u003e\n\u003cli\u003e✔ Complete Trailer Wheel End Service Kits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eComplete your trailer wheel-end service with premium bearings, hub oil, seals, and brake components for maximum reliability and reduced downtime.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"RevHD","offers":[{"title":"Default Title","offer_id":67044791648301,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/RNG_R1-T04_Front_Asset_1.jpg?v=1789965736"},{"product_id":"rev-hd-rm-t03-trailer-wheel-seal","title":"REV HD RM-T03 | Rev Max Trailer Wheel Seal – TN Spindle","description":"\n\u003ch2\u003eREV HD RM-T03 Rev Max Trailer Wheel Seal – TN Spindle\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eREV HD RM-T03 Rev Max Trailer Wheel Seal\u003c\/strong\u003e is a premium, severe-duty wheel-end seal designed for heavy-duty semi trailers equipped with compatible \u003cstrong\u003eTN (tapered) axle spindles\u003c\/strong\u003e. Engineered to help prevent wheel hub lubricant leaks and protect trailer wheel bearings from dirt, water, and road contaminants, the RM-T03 provides dependable sealing performance for demanding commercial trailer applications.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing REV HD's innovative \u003cstrong\u003eFlex Seal technology\u003c\/strong\u003e, HNBR sealing material, wider sealing contact areas, and multiple internal sealing points, the RM-T03 offers a premium replacement solution for compatible SKF, Stemco, National, ConMet, and Meritor trailer wheel seal applications.\u003c\/p\u003e\n\n\u003ch2\u003eREV HD RM-T03 Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRev Max Premium Series:\u003c\/strong\u003e Severe-duty wheel seal designed for demanding commercial trailer wheel ends.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTN Spindle Compatibility:\u003c\/strong\u003e Designed for compatible tapered trailer axle spindle configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlex Seal Technology:\u003c\/strong\u003e Helps reduce the risk of cocked or misaligned seals during hub installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHNBR Sealing Material:\u003c\/strong\u003e Premium sealing material used in REV HD's Rev Max product line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Sealing Contact Areas:\u003c\/strong\u003e Increased contact coverage at the hub bore and spindle shoulder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple Internal Sealing Points:\u003c\/strong\u003e Help retain wheel-end lubricant and reduce contaminant entry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective Top Plate:\u003c\/strong\u003e Helps protect the seal against installation impacts and brake heat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; Grease Compatibility:\u003c\/strong\u003e Designed for compatible oil, grease, and semi-fluid grease wheel-end lubrication systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSevere-Duty Construction:\u003c\/strong\u003e Suitable for demanding highway, vocational, and off-road trailer applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConvenient Installation:\u003c\/strong\u003e Designed for installation using a suitable flat installation surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Extend Included:\u003c\/strong\u003e Includes REV HD's proprietary sealing compound for use according to manufacturer instructions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Year Manufacturer Warranty:\u003c\/strong\u003e Subject to REV HD warranty terms and conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHeavy-Duty Trailer Wheel Seal for TN Spindles\u003c\/h2\u003e\n\n\u003cp\u003eTrailer axle wheel seals are essential components of the wheel-end lubrication system. They help retain oil or grease inside the hub assembly while protecting wheel bearings from contamination.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eREV HD RM-T03 trailer hub seal\u003c\/strong\u003e is designed for compatible TN spindle trailer axle configurations commonly used in commercial semi trailers. Its severe-duty construction makes it an excellent option for fleet maintenance, trailer repair shops, and owner-operators seeking reliable wheel-end sealing components.\u003c\/p\u003e\n\n\u003cp\u003eApplications may include compatible dry van, refrigerated, flatbed, tanker, and other commercial trailers equipped with the correct TN spindle and hub configuration.\u003c\/p\u003e\n\n\u003ch2\u003eREV HD Flex Seal Technology\u003c\/h2\u003e\n\n\u003cp\u003eImproper wheel seal alignment during hub installation can contribute to premature leakage and wheel-end failures.\u003c\/p\u003e\n\n\u003cp\u003eREV HD's unique \u003cstrong\u003eFlex Seal design\u003c\/strong\u003e allows controlled movement at the seal's inner diameter as the hub is positioned onto the spindle, helping reduce the risk of seal cocking during installation.\u003c\/p\u003e\n\n\u003cp\u003eCombined with wider inner and outer sealing surfaces, multiple internal sealing points, and a protective top plate, the design helps provide dependable lubricant retention and contaminant protection in demanding trailer service.\u003c\/p\u003e\n\n\u003ch2\u003ePremium HNBR Sealing Technology\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eREV HD Rev Max series\u003c\/strong\u003e incorporates HNBR sealing material for demanding wheel-end applications. Its premium construction is designed to provide durable sealing performance in commercial trucking environments involving vibration, temperature changes, and extended highway operation.\u003c\/p\u003e\n\n\u003cp\u003eThe RM-T03 also features sealing lips that operate against a polished sealing surface to support consistent sealing performance.\u003c\/p\u003e\n\n\u003ch2\u003eREV HD RM-T03 Wheel Seal Cross References\u003c\/h2\u003e\n\n\u003cp\u003eThe REV HD RM-T03 is commonly cross-referenced with the following heavy-duty trailer wheel seal part numbers:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKF \/ Chicago Rawhide:\u003c\/strong\u003e 46300, 46304, 46305, 46308\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNational:\u003c\/strong\u003e 370025A, 380025A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStemco:\u003c\/strong\u003e 373-0143, 373-0243, 372-7097, 307-0743\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConMet:\u003c\/strong\u003e 10045888\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeritor:\u003c\/strong\u003e MER0243\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eREV HD Rev 1:\u003c\/strong\u003e R1-T03\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Note:\u003c\/strong\u003e These numbers are provided for parts identification and interchange research. Seal designs and installation requirements may differ by manufacturer. Always confirm the spindle configuration, hub bore, and original seal dimensions before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Trailer Axle Applications\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eREV HD RM-T03 TN spindle wheel seal\u003c\/strong\u003e may be used in compatible trailer wheel-end assemblies from axle manufacturers such as Hendrickson, Meritor, and Dana\/Spicer when the required seal specifications match.\u003c\/p\u003e\n\n\u003cp\u003ePotential commercial trailer applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eDry van trailers\u003c\/li\u003e\n\u003cli\u003eRefrigerated trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed trailers\u003c\/li\u003e\n\u003cli\u003eTank trailers\u003c\/li\u003e\n\u003cli\u003eHeavy-duty commercial trailers\u003c\/li\u003e\n\u003cli\u003eRegional delivery trailers\u003c\/li\u003e\n\u003cli\u003eOver-the-road semi trailers\u003c\/li\u003e\n\u003cli\u003eVocational and severe-duty trailer applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCompatible TN spindle wheel ends may be found on trailers manufactured by Great Dane, Utility, Wabash, Vanguard, Hyundai Translead, Stoughton, and other commercial trailer manufacturers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Trailer brand alone does not guarantee compatibility. Confirm the actual spindle type, wheel hub configuration, and original seal specifications.\u003c\/p\u003e\n\n\u003ch2\u003eOil \u0026amp; Grease Wheel Hub Compatibility\u003c\/h2\u003e\n\n\u003cp\u003eThe REV HD RM-T03 is designed for use with compatible oil-bath, grease, and semi-fluid grease wheel-end lubrication systems. This versatility makes it a practical replacement option for many commercial trailer maintenance applications.\u003c\/p\u003e\n\n\u003cp\u003eAlways follow the axle and hub manufacturer's requirements for approved lubricants, lubricant quantity, bearing adjustment, and wheel-end service procedures.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Trailer Wheel Seal\u003c\/h2\u003e\n\n\u003cp\u003eA leaking trailer wheel seal can cause lubricant loss, wheel bearing damage, and contamination of nearby brake components.\u003c\/p\u003e\n\n\u003cp\u003eCommon warning signs include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eOil or grease leaking from the trailer wheel hub\u003c\/li\u003e\n\u003cli\u003eLubricant accumulation on the inside of the trailer wheel\u003c\/li\u003e\n\u003cli\u003eGrease or oil contamination around brake components\u003c\/li\u003e\n\u003cli\u003eLow hub lubricant levels\u003c\/li\u003e\n\u003cli\u003eVisible damage to the existing wheel seal\u003c\/li\u003e\n\u003cli\u003eAbnormal wheel bearing wear\u003c\/li\u003e\n\u003cli\u003eWheel-end overheating associated with lubrication problems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhen replacing a failed wheel seal, inspect the hub bore, spindle sealing surfaces, bearings, and related wheel-end components for wear or damage.\u003c\/p\u003e\n\n\u003ch2\u003eREV HD RM-T03 Product Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e REV HD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Series:\u003c\/strong\u003e Rev Max\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e RM-T03\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Trailer Axle Wheel Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAxle Position:\u003c\/strong\u003e Trailer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle Type:\u003c\/strong\u003e TN (Tapered)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Inner Diameter:\u003c\/strong\u003e 4.625 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Outer Diameter:\u003c\/strong\u003e 6.000 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealing Material:\u003c\/strong\u003e HNBR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication Compatibility:\u003c\/strong\u003e Oil, Grease, and Compatible Semi-Fluid Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Design:\u003c\/strong\u003e Rev Max Severe-Duty Flex Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 3 Years, Subject to Warranty Terms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 603016607128\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Wheel Seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation \u0026amp; Fitment Verification\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eREV HD RM-T03\u003c\/strong\u003e is designed for specific TN spindle trailer wheel-end configurations. It should not be assumed to fit every commercial trailer axle.\u003c\/p\u003e\n\n\u003cp\u003eBefore installation, verify the original seal part number, spindle dimensions, hub bore, and wheel-end configuration. Inspect sealing surfaces for scoring, corrosion, excessive wear, or damage that may affect sealing performance.\u003c\/p\u003e\n\n\u003cp\u003eFollow REV HD installation instructions and the axle manufacturer's recommended wheel-end service procedures. Use the included Seal Extend compound only as directed by REV HD.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Recommended:\u003c\/strong\u003e Wheel-end seals are critical to trailer bearing lubrication and commercial vehicle safety. Always verify correct bearing adjustment, approved lubricant levels, and wheel-end condition before returning the trailer to service.\u003c\/p\u003e\n","brand":"RevHD","offers":[{"title":"Default Title","offer_id":67052024070189,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/RNG_RM-T04_Front_Asset_1.jpg?v=1789965724"},{"product_id":"skf-46305-trailer-wheel-seal-tn-225k","title":"SKF 46305 Trailer Wheel Seal | TN 22.5K Axle","description":"\u003ch2\u003eSKF 46305 Trailer Wheel Seal – TN 22,500 lb Trailer Axle\u003c\/h2\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eSKF 46305 Trailer Wheel Seal\u003c\/strong\u003e is a heavy-duty Scotseal Classic wheel seal designed for \u003cstrong\u003eTN trailer axle applications rated up to 22,500 lb\u003c\/strong\u003e. Engineered to help retain wheel-end lubricant and protect bearings from dirt, moisture, and other contaminants, this seal is an excellent choice for commercial trailer wheel-end service and fleet maintenance.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe SKF 46305 features a \u003cstrong\u003eunitized, one-piece design with three spring-loaded sealing lips\u003c\/strong\u003e and a nitrile rubber sealing material. Its durable construction provides dependable sealing performance in demanding trailer applications while helping reduce lubricant loss and contamination. citeturn0search3turn0search4\n\u003c\/p\u003e\n\n\u003cp\u003e\nThis seal is commonly used with \u003cstrong\u003eDana Spicer, Rockwell, Eaton, and Standard Forge\u003c\/strong\u003e trailer axle applications. Always verify the axle model, seal dimensions, and application before installation. citeturn0search0\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eSKF Scotseal Classic trailer wheel seal\u003c\/li\u003e\n\u003cli\u003ePart number 46305\u003c\/li\u003e\n\u003cli\u003eDesigned for TN trailer axle applications\u003c\/li\u003e\n\u003cli\u003eRated for 22,500 lb trailer axles\u003c\/li\u003e\n\u003cli\u003eUnitized one-piece seal design\u003c\/li\u003e\n\u003cli\u003eThree spring-loaded sealing lips\u003c\/li\u003e\n\u003cli\u003eNitrile rubber sealing material\u003c\/li\u003e\n\u003cli\u003eBore coated with Bore-Tite\u003c\/li\u003e\n\u003cli\u003eHelps retain wheel-end lubricant\u003c\/li\u003e\n\u003cli\u003eHelps protect bearings from dirt and contaminants\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e SKF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Scotseal Classic Trailer Wheel Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Trailer Axle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAxle Type:\u003c\/strong\u003e TN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAxle Rating:\u003c\/strong\u003e 22,500 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft \/ Seal Inner Diameter:\u003c\/strong\u003e 4.625 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Outer Diameter:\u003c\/strong\u003e 6.006 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHousing Bore:\u003c\/strong\u003e 6.001 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Width:\u003c\/strong\u003e 1.063 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLip Material:\u003c\/strong\u003e Nitrile Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Type:\u003c\/strong\u003e Triple Lip with Spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eTN 22.5K trailer axles\u003c\/li\u003e\n\u003cli\u003eCommercial trailer wheel ends\u003c\/li\u003e\n\u003cli\u003eHeavy-duty trailer maintenance\u003c\/li\u003e\n\u003cli\u003eTrailer wheel bearing service\u003c\/li\u003e\n\u003cli\u003eFleet maintenance\u003c\/li\u003e\n\u003cli\u003eTrailer axle repairs\u003c\/li\u003e\n\u003cli\u003eWheel-end seal replacement\u003c\/li\u003e\n\u003cli\u003ePreventive wheel-end maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Helps prevent wheel-end lubricant leakage\u003c\/li\u003e\n\u003cli\u003e✔ Helps protect bearings from contamination\u003c\/li\u003e\n\u003cli\u003e✔ Durable unitized seal construction\u003c\/li\u003e\n\u003cli\u003e✔ Spring-loaded sealing lips provide dependable sealing\u003c\/li\u003e\n\u003cli\u003e✔ Bore-Tite coating helps support proper installation\u003c\/li\u003e\n\u003cli\u003e✔ Designed for demanding commercial trailer applications\u003c\/li\u003e\n\u003cli\u003e✔ Helps protect expensive wheel-end components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Choose SKF 46305?\u003c\/h3\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eSKF 46305 Scotseal Classic\u003c\/strong\u003e is designed specifically for demanding trailer wheel-end applications. Its unitized construction, triple-lip sealing design, and nitrile rubber sealing material provide dependable protection against lubricant loss and contamination.\n\u003c\/p\u003e\n\n\u003cp\u003e\nFor fleet operators and professional trailer technicians, replacing a worn or leaking wheel seal during wheel-end service can help protect bearings, reduce lubricant loss, and minimize the risk of premature wheel-end component failure.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWheel Seal Replacement\u003c\/h3\u003e\n\n\u003cp\u003e\nInspect the wheel seal whenever trailer hubs or wheel-end bearings are serviced. Signs of a damaged or worn seal can include \u003cstrong\u003elubricant around the hub, low lubricant levels, contaminated bearings, or recurring wheel-end leaks\u003c\/strong\u003e. Proper seal replacement helps maintain wheel-end lubrication and protect critical components.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCross Reference Part Numbers\u003c\/h3\u003e\n\n\u003cp\u003e\nThe SKF 46305 has numerous published cross-reference numbers, including \u003cstrong\u003eNational 370025A, National 380025A, Meritor MER0143, PAI BOS-7262, STEMCO 372-7097, Cummins 3070743, and REVHD R1-T03 \/ RM-T03\u003c\/strong\u003e. Cross-reference numbers should be used for identification only; always verify the exact axle and seal dimensions before ordering. citeturn0search2turn0search4\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#f8f8f8;padding:25px;border-left:4px solid #ff6a00;margin:25px 0;\"\u003e\n\u003ch3\u003e🔧 Complete Your Wheel-End Service\u003c\/h3\u003e\n\n\u003cp\u003eStock the components and shop supplies needed for professional heavy-duty trailer maintenance.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Trailer Wheel Seals\u003c\/li\u003e\n\u003cli\u003e✔ Drive Axle Wheel Seals\u003c\/li\u003e\n\u003cli\u003e✔ Steer Axle Wheel Seals\u003c\/li\u003e\n\u003cli\u003e✔ Wheel Bearings\u003c\/li\u003e\n\u003cli\u003e✔ Heavy-Duty Grease\u003c\/li\u003e\n\u003cli\u003e✔ Shop Towels \u0026amp; Cleaning Cloths\u003c\/li\u003e\n\u003cli\u003e✔ Work Gloves\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#fff7ef;padding:20px;border:1px solid #ffb366;border-radius:8px;\"\u003e\n\u003ch3\u003e🚛 Frequently Purchased Together\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ REV HD R1-T03 Trailer Wheel Seal\u003c\/li\u003e\n\u003cli\u003e✔ REV HD RM-T03 Trailer Axle Seal\u003c\/li\u003e\n\u003cli\u003e✔ Heavy-Duty Wheel Bearings\u003c\/li\u003e\n\u003cli\u003e✔ Super Lube Grease\u003c\/li\u003e\n\u003cli\u003e✔ Lubriplate No. 105 Grease\u003c\/li\u003e\n\u003cli\u003e✔ Scott® Blue Shop Towels\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eComplete your trailer wheel-end service with quality seals, bearings, lubricants, cleaning products, and heavy-duty maintenance supplies.\u003c\/strong\u003e\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SKF","offers":[{"title":"Default Title","offer_id":67352113152045,"sku":null,"price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/SKF_Seal.jpg?v=1790129072"},{"product_id":"power-products-3030sb-gold-sealed-spring-brake-chamber","title":"Power Products 3030SB | Gold Sealed 30\/30 Spring Brake Chamber","description":"\n\u003ch2\u003ePower Products 3030SB Gold Sealed 30\/30 Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003ePower Products 3030SB Gold Sealed Spring Brake Chamber\u003c\/strong\u003e is a heavy-duty Type 30\/30 combination air brake chamber designed for compatible commercial trucks and trailers. Built with a corrosion-resistant gold epoxy-coated steel housing, reinforced mounting studs, and protective dust shielding, this standard-stroke brake chamber is engineered for demanding highway and vocational applications.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a \u003cstrong\u003e2.5-inch standard stroke\u003c\/strong\u003e, Type 30 service chamber, and Type 30 spring parking brake chamber, the Power Products 3030SB combines service braking and spring-applied parking\/emergency braking functions in one assembly.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're replacing a leaking air brake chamber, servicing a commercial truck's braking system, or maintaining a fleet of heavy-duty vehicles, the \u003cstrong\u003e3030SB spring brake chamber\u003c\/strong\u003e provides a durable replacement option when its specifications match the original equipment.\u003c\/p\u003e\n\n\u003ch2\u003ePower Products 3030SB Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 30\/30 Combination Chamber:\u003c\/strong\u003e Combines service brake and spring parking brake functions in one assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2.5-Inch Stroke:\u003c\/strong\u003e Designed for compatible standard-stroke air brake applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold Epoxy-Coated Housing:\u003c\/strong\u003e Helps protect the steel chamber housing against rust and corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEpoxy-Coated Springs:\u003c\/strong\u003e Coated return and power springs provide additional corrosion protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced Mounting Studs:\u003c\/strong\u003e Provide mounting rigidity and help resist damage during demanding service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective Dust Shield:\u003c\/strong\u003e Helps keep dirt, sand, moisture, and other contaminants away from vulnerable components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Steel Construction:\u003c\/strong\u003e Built for demanding commercial vehicle operating environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE-Standard Fasteners:\u003c\/strong\u003e Fasteners are specified to meet applicable SAE tensile-strength requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealed Spring Brake Design:\u003c\/strong\u003e Designed for durable operation in compatible heavy-duty air brake systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial Truck \u0026amp; Trailer Applications:\u003c\/strong\u003e Suitable for properly matched Type 30\/30 brake assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHeavy-Duty 30\/30 Spring Brake Chamber for Semi Trucks\u003c\/h2\u003e\n\n\u003cp\u003eA spring brake chamber is an essential part of a commercial vehicle's air braking system. Combination spring brake chambers perform two important functions:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Braking:\u003c\/strong\u003e Compressed air acts on the service diaphragm to apply the foundation brakes during normal braking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParking and Emergency Braking:\u003c\/strong\u003e A powerful internal spring applies the brakes when parking-brake release pressure is removed or insufficient.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe \u003cstrong\u003ePower Products 3030SB\u003c\/strong\u003e is intended for compatible heavy-duty trucks and trailers equipped with Type 30\/30 standard-stroke spring brake chambers.\u003c\/p\u003e\n\n\u003cp\u003ePotential applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eClass 7 and Class 8 semi trucks\u003c\/li\u003e\n\u003cli\u003eCommercial truck tractors\u003c\/li\u003e\n\u003cli\u003eHeavy-duty trailers\u003c\/li\u003e\n\u003cli\u003eVocational trucks\u003c\/li\u003e\n\u003cli\u003eDump trucks\u003c\/li\u003e\n\u003cli\u003eFleet maintenance vehicles\u003c\/li\u003e\n\u003cli\u003eOther compatible air-brake-equipped commercial vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Fitment must be confirmed by the original brake chamber specifications, mounting configuration, pushrod requirements, and stroke designation. Vehicle make and model alone do not guarantee compatibility.\u003c\/p\u003e\n\n\u003ch2\u003eGold Epoxy Coating for Corrosion Protection\u003c\/h2\u003e\n\n\u003cp\u003eThe Power Products 3030SB features a gold epoxy-coated steel housing designed to help protect against corrosion caused by road moisture, dirt, and harsh operating environments.\u003c\/p\u003e\n\n\u003cp\u003eIts return and power springs are also epoxy coated, providing additional protection for internal spring components. This construction makes the chamber a practical choice for commercial vehicles exposed to demanding road conditions.\u003c\/p\u003e\n\n\u003ch2\u003eReinforced Mounting Studs \u0026amp; Protective Dust Shield\u003c\/h2\u003e\n\n\u003cp\u003eSecure mounting and contamination protection are important to long-term brake chamber performance.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e3030SB brake chamber\u003c\/strong\u003e incorporates reinforced mounting studs to improve rigidity and help prevent mounting-related damage. Its protective dust shield helps reduce the entry of road dirt, sand, and moisture.\u003c\/p\u003e\n\n\u003ch2\u003eStandard Stroke vs. Long Stroke Brake Chambers\u003c\/h2\u003e\n\n\u003cp\u003eThe Power Products 3030SB is a \u003cstrong\u003estandard-stroke Type 30\/30 brake chamber with a nominal 2.5-inch maximum stroke\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eStandard-stroke and long-stroke chambers are not automatically interchangeable. Long-stroke Type 30\/30 chambers may have different travel capabilities, identification markings, and application requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not substitute a standard-stroke chamber for a long-stroke chamber.\u003c\/strong\u003e Always verify the required stroke type before ordering.\u003c\/p\u003e\n\n\u003ch2\u003ePower Products 3030SB Cross References\u003c\/h2\u003e\n\n\u003cp\u003eCommon commercial truck parts catalog references associated with the Power Products 3030SB include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Products:\u003c\/strong\u003e 3030SB, 3030SB-PDC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomann:\u003c\/strong\u003e 179.SB3030S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHaldex:\u003c\/strong\u003e 12500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMGM Brakes:\u003c\/strong\u003e 3430051, 3431051, 3531051\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEuclid:\u003c\/strong\u003e EGC3030\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrote:\u003c\/strong\u003e 53132\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e OTR3030SB, OTR3030SB2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional Catalog Reference:\u003c\/strong\u003e 3030C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Note:\u003c\/strong\u003e These numbers are provided for parts identification. Brake chamber specifications may vary between manufacturers and individual configurations. Verify stroke, mounting dimensions, pushrod length, clevis requirements, and original equipment specifications before purchasing.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eBrake chamber problems should be inspected promptly because they can affect commercial vehicle braking performance.\u003c\/p\u003e\n\n\u003cp\u003eCommon signs that a brake chamber requires inspection or replacement include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eAir leakage around the brake chamber\u003c\/li\u003e\n\u003cli\u003eFailure to release the parking brakes correctly\u003c\/li\u003e\n\u003cli\u003eAbnormal brake chamber pushrod movement\u003c\/li\u003e\n\u003cli\u003eCorrosion or visible damage to the chamber housing\u003c\/li\u003e\n\u003cli\u003eDamaged mounting studs or mounting hardware\u003c\/li\u003e\n\u003cli\u003eBrake application or release problems\u003c\/li\u003e\n\u003cli\u003eFailed air brake system inspections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eInspect the complete braking system to determine whether the issue is caused by the chamber, air lines, valves, slack adjuster, foundation brake components, or another related part.\u003c\/p\u003e\n\n\u003ch2\u003ePower Products 3030SB Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Power Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Gold Sealed Spring Brake Chamber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 3030SB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog MPN:\u003c\/strong\u003e 3030SB-PDC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Combination Spring Brake Chamber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamber Size:\u003c\/strong\u003e Type 30\/30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Chamber Size:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Chamber Size:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Type:\u003c\/strong\u003e Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Stroke:\u003c\/strong\u003e 2.50 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePushrod Length:\u003c\/strong\u003e 8.00 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Spacing:\u003c\/strong\u003e 4.75 Inches, Center to Center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Threads:\u003c\/strong\u003e 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Housing Outer Diameter:\u003c\/strong\u003e 8.21 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHousing Construction:\u003c\/strong\u003e Heavy-Duty Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Gold Epoxy Coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Springs:\u003c\/strong\u003e Epoxy-Coated Return and Power Springs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Compatible Heavy-Duty Truck and Trailer Air Brake Systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Brake Chamber\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation \u0026amp; Fitment Verification\u003c\/h2\u003e\n\n\u003cp\u003eBefore installing the \u003cstrong\u003ePower Products 3030SB\u003c\/strong\u003e, verify the original brake chamber size, stroke designation, mounting stud spacing, pushrod length, clevis configuration, and all applicable vehicle brake system requirements.\u003c\/p\u003e\n\n\u003cp\u003eBrake chamber pushrod length and adjustment must be determined according to the manufacturer's service procedure. Do not assume the replacement chamber can be installed without checking the complete brake linkage geometry.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCritical Safety Warning:\u003c\/strong\u003e Spring brake chambers contain a powerful compressed spring that can cause severe injury or death if improperly handled. Never cut, open, or attempt to disassemble the sealed spring brake housing. Follow the manufacturer's approved caging, removal, installation, and testing procedures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Required:\u003c\/strong\u003e Commercial vehicle air brake systems are safety-critical. Installation, inspection, and adjustment should be performed by qualified technicians following the vehicle and brake manufacturer's instructions.\u003c\/p\u003e\n","brand":"Power Products","offers":[{"title":"Default Title","offer_id":67678500159533,"sku":null,"price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/3030SB_P04_ANG.jpg?v=1792046098"},{"product_id":"otr-otr3030sb2-3030-standard-stroke-spring-brake-chamber","title":"OTR OTR3030SB2 | Type 30\/30 Standard Stroke Spring Brake Chamber","description":"\n\u003ch2\u003eOTR OTR3030SB2 Type 30\/30 Standard Stroke Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eMaintain dependable air brake system performance with the \u003cstrong\u003eOTR OTR3030SB2 Type 30\/30 Standard Stroke Spring Brake Chamber\u003c\/strong\u003e. Designed for compatible heavy-duty trucks and trailers, this combination spring brake chamber provides service braking and spring-applied parking brake functionality in a durable, corrosion-resistant assembly.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a \u003cstrong\u003e2.5-inch standard stroke, 8-inch pushrod, reinforced mounting studs, and epoxy-coated steel housing\u003c\/strong\u003e, the OTR3030SB2 is engineered for demanding commercial vehicle applications. Its heavy-duty construction makes it a practical replacement for worn, damaged, or leaking Type 30\/30 brake chambers when all installation specifications match.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This is a standard-stroke brake chamber, not a long-stroke model. Verify the original chamber configuration before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eOTR OTR3030SB2 Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 30\/30 Combination Chamber:\u003c\/strong\u003e Combines normal service braking and spring-applied parking brake functions in one assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5-Inch Standard Stroke:\u003c\/strong\u003e Designed for compatible standard-stroke air brake systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8-Inch Pushrod:\u003c\/strong\u003e Provides the specified pushrod configuration for properly matched brake applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEpoxy-Coated Steel Housing:\u003c\/strong\u003e Non-pressure epoxy coating helps resist corrosion and rust in demanding road environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty 10-Gauge Housing:\u003c\/strong\u003e Durable construction for commercial truck and trailer service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced Mounting Studs:\u003c\/strong\u003e Designed to provide mounting strength and rigidity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZinc-Coated Clamp Bands:\u003c\/strong\u003e Matched-stamping construction helps maintain secure sealing and long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-Welded Pushrod Plate:\u003c\/strong\u003e Thick steel pushrod plate engineered for strength and durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective Dust Shield:\u003c\/strong\u003e Helps keep dirt, sand, and moisture away from vulnerable brake chamber components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaging Bolt Included:\u003c\/strong\u003e Supplied with the manufacturer's specified caging bolt for approved service procedures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-Year Limited Warranty:\u003c\/strong\u003e Listed manufacturer\/distributor warranty, subject to applicable terms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHeavy-Duty Type 30\/30 Air Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOTR3030SB2 spring brake chamber\u003c\/strong\u003e is a combination air brake actuator used in compatible commercial vehicle braking systems.\u003c\/p\u003e\n\n\u003cp\u003eIt performs two important functions:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Braking:\u003c\/strong\u003e Compressed air enters the service chamber and moves the diaphragm and pushrod to actuate the foundation brake system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParking and Emergency Braking:\u003c\/strong\u003e The internal power spring applies the parking brakes when release air pressure is removed or becomes insufficient.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCorrect brake chamber sizing and installation are essential for maintaining proper brake operation and vehicle safety.\u003c\/p\u003e\n\n\u003ch2\u003eCommercial Truck \u0026amp; Trailer Applications\u003c\/h2\u003e\n\n\u003cp\u003eOTR Type 30\/30 spring brake chambers are used in various commercial vehicles equipped with compatible air-operated foundation brakes.\u003c\/p\u003e\n\n\u003cp\u003ePotential applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eClass 7 and Class 8 semi trucks\u003c\/li\u003e\n\u003cli\u003eCommercial truck tractors\u003c\/li\u003e\n\u003cli\u003eHeavy-duty trailers\u003c\/li\u003e\n\u003cli\u003eDry van and flatbed trailers\u003c\/li\u003e\n\u003cli\u003eVocational trucks\u003c\/li\u003e\n\u003cli\u003eDump trucks\u003c\/li\u003e\n\u003cli\u003eCommercial fleet vehicles\u003c\/li\u003e\n\u003cli\u003eOther vehicles using compatible Type 30\/30 standard-stroke spring brake assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Vehicle make, model, and axle position do not establish compatibility by themselves. Verify the original brake chamber size, stroke, pushrod length, mounting dimensions, and brake linkage requirements.\u003c\/p\u003e\n\n\u003ch2\u003eCorrosion-Resistant Epoxy-Coated Housing\u003c\/h2\u003e\n\n\u003cp\u003eCommercial truck brake components are routinely exposed to moisture, road salt, dirt, and debris. The OTR3030SB2 features a non-pressure epoxy-coated steel housing designed to help protect against long-term corrosion.\u003c\/p\u003e\n\n\u003cp\u003eThe zinc-coated clamp bands and protective dust shield provide additional protection against environmental contamination and support durable operation in heavy-duty service conditions.\u003c\/p\u003e\n\n\u003ch2\u003eReinforced Mounting Studs \u0026amp; Heavy-Duty Pushrod Plate\u003c\/h2\u003e\n\n\u003cp\u003eThe OTR3030SB2 incorporates reinforced mounting studs to help resist mounting damage and maintain structural rigidity.\u003c\/p\u003e\n\n\u003cp\u003eIts thick steel pushrod plate features CNC-welded construction designed for demanding commercial braking applications. Proper installation and brake linkage alignment are essential to achieving the intended service performance.\u003c\/p\u003e\n\n\u003ch2\u003eStandard Stroke vs. Long Stroke Brake Chambers\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOTR3030SB2 is a Type 30\/30 standard-stroke brake chamber with a 2.5-inch maximum rated stroke\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eStandard-stroke and long-stroke chambers have different stroke capabilities and may have different identification markings, adjustment limits, and service requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not substitute this standard-stroke brake chamber for a long-stroke unit.\u003c\/strong\u003e Always confirm the correct stroke designation using the original chamber and vehicle manufacturer's specifications.\u003c\/p\u003e\n\n\u003ch2\u003eOTR OTR3030SB2 Cross References\u003c\/h2\u003e\n\n\u003cp\u003eCommercial truck parts catalogs associate OTR3030SB2 with several standard-stroke Type 30\/30 brake chamber references, including:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e OTR3030SB2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR Manufacturer Number:\u003c\/strong\u003e OTR3030SB-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Products:\u003c\/strong\u003e 3030SB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomann:\u003c\/strong\u003e 179.SB3030S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBendix:\u003c\/strong\u003e K129605\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBendix:\u003c\/strong\u003e NT3030STD78TC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDayton:\u003c\/strong\u003e 3030C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeritor:\u003c\/strong\u003e 3030TN2C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMGM Brakes:\u003c\/strong\u003e 3430051\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMGM Brakes:\u003c\/strong\u003e 3630051\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e OTR3030SB\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Warning:\u003c\/strong\u003e These numbers are catalog interchange references, not a guarantee of identical configurations. Pushrod lengths, clevis arrangements, stroke specifications, and other installation requirements may differ. Confirm all critical dimensions and the approved application before replacing a brake chamber.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eA defective brake chamber can affect parking brake release, service brake operation, and air system performance. Brake problems should be diagnosed promptly by a qualified technician.\u003c\/p\u003e\n\n\u003cp\u003eCommon symptoms include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eAudible air leaks near the brake chamber\u003c\/li\u003e\n\u003cli\u003eDifficulty releasing the parking brakes\u003c\/li\u003e\n\u003cli\u003eAbnormal pushrod travel\u003c\/li\u003e\n\u003cli\u003eVisible corrosion or damage to the chamber housing\u003c\/li\u003e\n\u003cli\u003eDamaged mounting studs or brackets\u003c\/li\u003e\n\u003cli\u003eInconsistent brake application or release\u003c\/li\u003e\n\u003cli\u003eFailed commercial vehicle brake inspections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eOther brake system components can produce similar symptoms. Inspect the air supply system, control valves, slack adjusters, foundation brakes, and related components before determining the necessary repair.\u003c\/p\u003e\n\n\u003ch2\u003eOTR OTR3030SB2 Product Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OTR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e OTR3030SB2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e OTR3030SB-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Combination Spring Brake Chamber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamber Size:\u003c\/strong\u003e Type 30\/30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Chamber Type:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Chamber Type:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Type:\u003c\/strong\u003e Standard Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Length:\u003c\/strong\u003e 2.50 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePushrod Length:\u003c\/strong\u003e 8.00 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Spacing:\u003c\/strong\u003e 4.75 Inches, Center to Center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Threads:\u003c\/strong\u003e 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHousing:\u003c\/strong\u003e Heavy-Duty Epoxy-Coated Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamber Configuration:\u003c\/strong\u003e Double Diaphragm, Spring Combination\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaging Bolt:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2 Years, Subject to Warranty Terms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVMRS:\u003c\/strong\u003e 013-010-034\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Spring Brake Chamber\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBrake Chamber Installation \u0026amp; Safety Information\u003c\/h2\u003e\n\n\u003cp\u003eBefore ordering or installing the OTR3030SB2, verify the original brake chamber's size, stroke, pushrod length, mounting stud spacing, clevis requirements, and applicable brake system specifications.\u003c\/p\u003e\n\n\u003cp\u003eBrake chamber installation must follow the vehicle and brake manufacturer's approved procedures. Inspect brake linkage geometry, pushrod travel, mounting hardware, and related foundation brake components before returning the vehicle to service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCritical Safety Warning:\u003c\/strong\u003e Spring brake chambers contain a powerful compressed spring that can cause severe injury or death if improperly handled. Never cut, open, or disassemble the spring brake housing. Follow the manufacturer's approved procedures for caging, removal, installation, and testing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Recommended:\u003c\/strong\u003e Air brake systems are safety-critical. All brake chamber replacement and adjustment work should be performed by qualified personnel.\u003c\/p\u003e\n","brand":"OTR","offers":[{"title":"Default Title","offer_id":67678543380525,"sku":null,"price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/OTR3030SB2_-2_20_1.jpg?v=1792047355"},{"product_id":"otr-otr3030sb-3030-standard-stroke-spring-brake-chamber","title":"OTR OTR3030SB | 30\/30 Standard Stroke Spring Brake Chamber","description":"\n\u003ch2\u003eOTR OTR3030SB Type 30\/30 Standard Stroke Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eMaintain reliable commercial vehicle braking performance with the \u003cstrong\u003eOTR OTR3030SB Type 30\/30 Standard Stroke Spring Brake Chamber\u003c\/strong\u003e. Designed for compatible heavy-duty trucks and trailers, this combination spring brake chamber provides both service braking and spring-applied parking brake functionality in one durable assembly.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a \u003cstrong\u003e2.5-inch standard stroke, 9.75-inch pushrod, reinforced mounting studs, and heavy-duty construction\u003c\/strong\u003e, the OTR3030SB is engineered to withstand demanding commercial vehicle operating conditions.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're replacing a leaking brake chamber, repairing a trailer air brake system, or maintaining a commercial truck fleet, the OTR3030SB provides a replacement option for properly matched Type 30\/30 brake applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This product is a standard-stroke brake chamber with a 9.75-inch pushrod. Verify your existing brake chamber specifications before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eOTR OTR3030SB Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 30\/30 Combination Brake Chamber:\u003c\/strong\u003e Combines service braking and spring-applied parking brake functions in one assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5-Inch Standard Stroke:\u003c\/strong\u003e Designed for compatible standard-stroke air brake systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9.75-Inch Pushrod:\u003c\/strong\u003e Provides the specified pushrod length for properly matched brake linkage configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced Mounting Studs:\u003c\/strong\u003e Designed to provide additional rigidity and resist mounting-related damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Steel Pushrod Plate:\u003c\/strong\u003e Thick steel construction with precision welding for strength and durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective Dust Shield:\u003c\/strong\u003e Helps keep dirt, sand, moisture, and road contaminants away from vulnerable components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant Construction:\u003c\/strong\u003e Designed for demanding commercial truck and trailer environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaging Bolt Included:\u003c\/strong\u003e Supplied for use during approved brake chamber service procedures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE Standards:\u003c\/strong\u003e Manufacturer identifies the chamber as meeting or exceeding applicable SAE requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Year Limited Warranty:\u003c\/strong\u003e Listed warranty coverage, subject to applicable supplier terms and conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHeavy-Duty Type 30\/30 Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOTR3030SB spring brake chamber\u003c\/strong\u003e is a combination air brake actuator used in commercial vehicle drum brake systems.\u003c\/p\u003e\n\n\u003cp\u003eIt performs two essential braking functions:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Braking:\u003c\/strong\u003e Compressed air acts on the service chamber diaphragm, moving the pushrod to operate the foundation brake mechanism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParking and Emergency Braking:\u003c\/strong\u003e A powerful internal spring applies the parking brakes when spring-brake release pressure is removed or becomes insufficient.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe Type 30\/30 designation identifies the service and spring brake chamber sizes. Proper chamber selection is essential for maintaining the braking system's intended performance.\u003c\/p\u003e\n\n\u003ch2\u003eCommercial Truck \u0026amp; Trailer Applications\u003c\/h2\u003e\n\n\u003cp\u003eThe OTR3030SB is designed for compatible heavy-duty commercial vehicle air brake systems requiring a Type 30\/30 standard-stroke combination chamber.\u003c\/p\u003e\n\n\u003cp\u003ePotential applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHeavy-duty semi trucks\u003c\/li\u003e\n\u003cli\u003eClass 7 and Class 8 commercial trucks\u003c\/li\u003e\n\u003cli\u003eTruck tractors\u003c\/li\u003e\n\u003cli\u003eCommercial trailers\u003c\/li\u003e\n\u003cli\u003eDry van and flatbed trailers\u003c\/li\u003e\n\u003cli\u003eVocational trucks\u003c\/li\u003e\n\u003cli\u003eDump trucks\u003c\/li\u003e\n\u003cli\u003eCommercial fleet vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Compatibility depends on the installed brake system, chamber configuration, pushrod length, mounting dimensions, and brake linkage requirements. Vehicle make and model alone do not establish fitment.\u003c\/p\u003e\n\n\u003ch2\u003e9.75-Inch Pushrod for Standard-Stroke Applications\u003c\/h2\u003e\n\n\u003cp\u003eOne of the most important specifications of the OTR3030SB is its \u003cstrong\u003e9.75-inch pushrod length\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eDifferent Type 30\/30 spring brake chambers may have similar external appearances but different pushrod lengths and installation requirements.\u003c\/p\u003e\n\n\u003cp\u003eFor example, the OTR3030SB uses a 9.75-inch pushrod, while the OTR3030SB2 is listed with an 8-inch pushrod.\u003c\/p\u003e\n\n\u003cp\u003eAlways verify the required pushrod configuration, clevis arrangement, and brake linkage geometry before selecting a replacement chamber.\u003c\/p\u003e\n\n\u003ch2\u003eStandard Stroke vs. Long Stroke Brake Chambers\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOTR3030SB features a nominal 2.5-inch standard stroke\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eStandard-stroke and long-stroke chambers have different operating travel capabilities and may have different adjustment limits and identification markings.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not substitute this standard-stroke brake chamber for a long-stroke chamber.\u003c\/strong\u003e Confirm the original equipment stroke designation before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eHeavy-Duty Construction \u0026amp; Corrosion Protection\u003c\/h2\u003e\n\n\u003cp\u003eCommercial truck and trailer brake components are regularly exposed to road moisture, dirt, salt, vibration, and demanding operating conditions.\u003c\/p\u003e\n\n\u003cp\u003eThe OTR3030SB incorporates reinforced mounting studs, a durable steel pushrod plate, and a protective dust shield to help maintain structural integrity and reduce exposure to contaminants.\u003c\/p\u003e\n\n\u003cp\u003eThe chamber is designed and tested for demanding commercial braking applications.\u003c\/p\u003e\n\n\u003ch2\u003eOTR OTR3030SB Cross References\u003c\/h2\u003e\n\n\u003cp\u003eThe OTR3030SB appears in commercial truck parts interchange catalogs alongside other Type 30\/30 standard-stroke spring brake chamber products.\u003c\/p\u003e\n\n\u003cp\u003eRelevant catalog references include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e OTR3030SB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMGM Brakes:\u003c\/strong\u003e 3430551\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeritor:\u003c\/strong\u003e 3030TN2ULP-C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHaldex:\u003c\/strong\u003e LCP3030R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHaldex:\u003c\/strong\u003e GC3030R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry Interchange Reference:\u003c\/strong\u003e BTS-3030\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Warning:\u003c\/strong\u003e Catalog interchange numbers are intended for parts identification only. Confirm stroke, pushrod length, mounting dimensions, clevis configuration, and applicable brake system specifications before treating any listed part as a direct replacement.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eBrake chamber problems should be diagnosed promptly because they can affect commercial vehicle braking performance and safety.\u003c\/p\u003e\n\n\u003cp\u003eCommon symptoms include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eAir leaking from the brake chamber\u003c\/li\u003e\n\u003cli\u003eDifficulty releasing the parking brakes\u003c\/li\u003e\n\u003cli\u003eAbnormal or excessive pushrod travel\u003c\/li\u003e\n\u003cli\u003eVisible corrosion or physical damage\u003c\/li\u003e\n\u003cli\u003eDamaged mounting studs or brackets\u003c\/li\u003e\n\u003cli\u003eInconsistent brake application or release\u003c\/li\u003e\n\u003cli\u003eFailed commercial vehicle brake inspections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eOther brake system problems may produce similar symptoms. Inspect the air supply system, control valves, slack adjusters, foundation brakes, and related components before replacing the chamber.\u003c\/p\u003e\n\n\u003ch2\u003eOTR OTR3030SB Product Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OTR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e OTR3030SB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Combination Spring Brake Chamber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamber Size:\u003c\/strong\u003e Type 30\/30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Chamber Type:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Chamber Type:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Type:\u003c\/strong\u003e Standard Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Length:\u003c\/strong\u003e 2.50 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePushrod Length:\u003c\/strong\u003e 9.75 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Spacing:\u003c\/strong\u003e 4.75 Inches, Center to Center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Threads:\u003c\/strong\u003e 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Length:\u003c\/strong\u003e 1.54 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamber Configuration:\u003c\/strong\u003e Combination Spring Brake\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrake Application:\u003c\/strong\u003e Compatible Heavy-Duty Drum Brake Systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaging Bolt:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 4-Year Limited Warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVMRS:\u003c\/strong\u003e 013-010-034\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Brake Chamber\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBrake Chamber Installation \u0026amp; Safety Information\u003c\/h2\u003e\n\n\u003cp\u003eBefore purchasing or installing the OTR3030SB, verify the original brake chamber size, stroke designation, pushrod length, mounting stud spacing, clevis requirements, and applicable brake system specifications.\u003c\/p\u003e\n\n\u003cp\u003eFollow the vehicle and brake manufacturer's approved installation and inspection procedures. Confirm correct brake linkage geometry, pushrod travel, chamber mounting, and foundation brake operation before returning the vehicle to service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCritical Safety Warning:\u003c\/strong\u003e Spring brake chambers contain powerful compressed springs that can cause severe injury or death if improperly handled. Never cut, open, or disassemble the spring brake housing. Follow the manufacturer's approved procedures for caging, removal, installation, and testing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Recommended:\u003c\/strong\u003e Commercial vehicle braking systems are safety-critical. Brake chamber replacement, adjustment, and inspection should be performed by qualified technicians.\u003c\/p\u003e\n","brand":"OTR","offers":[{"title":"Default Title","offer_id":67678567170093,"sku":null,"price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/OTR-OTR3030SB_1.jpg?v=1792047784"},{"product_id":"otr-ws305-wheel-seal-22500-lb-trailer-axle","title":"OTR WS305 Wheel Seal | 22,500 lb Trailer Axles","description":"\n\u003ch2\u003eOTR WS305 Wheel Seal for 22,500 lb Trailer Axles\u003c\/h2\u003e\n\n\u003cp\u003eProtect your commercial trailer's wheel bearings and hub assemblies with the \u003cstrong\u003eOTR WS305 Wheel Seal for 22,500 lb Trailer Axles\u003c\/strong\u003e. Designed for compatible heavy-duty trailer wheel ends, this replacement oil-bath wheel seal helps retain critical wheel bearing lubricant while protecting internal hub components from dirt, moisture, and road contaminants.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing durable \u003cstrong\u003enitrile rubber sealing material\u003c\/strong\u003e, the OTR WS305 is designed for demanding commercial trailer applications. Its sealing construction helps prevent lubricant leakage and supports reliable wheel-end operation during long-distance hauling, regional transportation, and everyday fleet service.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're repairing a leaking trailer wheel seal, replacing wheel bearings, or performing preventive maintenance on a commercial trailer, the \u003cstrong\u003eOTR WS305\u003c\/strong\u003e provides an aftermarket replacement option for properly matched 46305-family wheel-end applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number: WS305 | Manufacturer Reference: GS-WS-46305\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eOTR WS305 Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e22,500 lb Trailer Axle Application:\u003c\/strong\u003e Designed for compatible heavy-duty commercial trailer axles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil-Bath Wheel Seal:\u003c\/strong\u003e Helps retain wheel-end lubricant inside the hub assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrile Rubber Sealing Material:\u003c\/strong\u003e Designed for demanding commercial vehicle wheel-end conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContamination Protection:\u003c\/strong\u003e Helps reduce the entry of dirt, dust, road debris, and moisture into the hub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubricant Retention:\u003c\/strong\u003e Helps prevent oil leakage when correctly installed in a compatible wheel-end assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel Bearing Protection:\u003c\/strong\u003e Supports proper lubrication of trailer wheel bearings and related components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Replacement:\u003c\/strong\u003e Suitable for qualifying commercial trailer maintenance and repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService-Friendly Installation:\u003c\/strong\u003e Designed for installation using appropriate seal-driving tools and manufacturer-approved procedures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFleet Maintenance Applications:\u003c\/strong\u003e Practical for trailer repair shops, commercial fleets, and owner-operators.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHeavy-Duty Trailer Wheel Seal for Commercial Trucks\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOTR WS305 trailer axle wheel seal\u003c\/strong\u003e helps maintain proper lubrication inside compatible commercial trailer wheel-end assemblies.\u003c\/p\u003e\n\n\u003cp\u003eWheel seals are essential components of the hub system because they help retain lubricant around the wheel bearings while preventing contaminants from entering the assembly.\u003c\/p\u003e\n\n\u003cp\u003eA correctly installed wheel seal helps:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eRetain wheel bearing lubricant inside the trailer hub\u003c\/li\u003e\n\u003cli\u003eReduce oil leaks around the wheel-end assembly\u003c\/li\u003e\n\u003cli\u003eProtect wheel bearings from dirt and moisture\u003c\/li\u003e\n\u003cli\u003eSupport consistent wheel-end lubrication\u003c\/li\u003e\n\u003cli\u003eHelp prevent lubricant-related bearing damage\u003c\/li\u003e\n\u003cli\u003eMaintain dependable commercial trailer operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDesigned for Compatible 22,500 lb Trailer Axles\u003c\/h2\u003e\n\n\u003cp\u003eThe OTR WS305 is intended for compatible \u003cstrong\u003e22,500 lb rated trailer axles\u003c\/strong\u003e using the required 46305-family wheel seal configuration.\u003c\/p\u003e\n\n\u003cp\u003ePotential applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHeavy-duty semi-trailers\u003c\/li\u003e\n\u003cli\u003eDry van trailers\u003c\/li\u003e\n\u003cli\u003eRefrigerated trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed trailers\u003c\/li\u003e\n\u003cli\u003eCommercial freight trailers\u003c\/li\u003e\n\u003cli\u003eVocational trailers\u003c\/li\u003e\n\u003cli\u003eFleet trailers with compatible wheel-end assemblies\u003c\/li\u003e\n\u003cli\u003eOther commercial trailer axles requiring the specified wheel seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Trailer type and axle weight rating alone do not determine wheel seal fitment. Verify the original wheel seal part number, spindle dimensions, hub bore, and wheel-end configuration before purchasing.\u003c\/p\u003e\n\n\u003ch2\u003eOil-Bath Wheel Seal for Trailer Hub Assemblies\u003c\/h2\u003e\n\n\u003cp\u003eThe OTR WS305 is designed for compatible oil-lubricated trailer wheel ends. Proper lubricant retention is essential for protecting wheel bearings and reducing the risk of premature wheel-end component failure.\u003c\/p\u003e\n\n\u003cp\u003eThe seal helps maintain a protective barrier between the lubricated wheel-end assembly and the external road environment.\u003c\/p\u003e\n\n\u003cp\u003eFor dependable performance, always use the correct wheel-end lubricant and follow the axle or hub manufacturer's service instructions.\u003c\/p\u003e\n\n\u003ch2\u003eNitrile Rubber Sealing Material\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOTR WS305\u003c\/strong\u003e features nitrile rubber sealing material designed to provide durable sealing performance in approved commercial vehicle applications.\u003c\/p\u003e\n\n\u003cp\u003eThe sealing material helps resist normal exposure to wheel-end lubricants while supporting a barrier against dirt and environmental contaminants.\u003c\/p\u003e\n\n\u003cp\u003eCorrect seal installation, bearing adjustment, and hub condition are critical to the performance of the complete wheel-end assembly.\u003c\/p\u003e\n\n\u003ch2\u003eOTR WS305 Wheel Seal Cross References\u003c\/h2\u003e\n\n\u003cp\u003eThe OTR WS305 is associated with the \u003cstrong\u003e46305 wheel seal family\u003c\/strong\u003e. Common commercial truck parts catalog interchange references include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e WS305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR Manufacturer Reference:\u003c\/strong\u003e GS-WS-46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKF:\u003c\/strong\u003e 46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKF:\u003c\/strong\u003e CR46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNational:\u003c\/strong\u003e 370025A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNational:\u003c\/strong\u003e 380025A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStemco:\u003c\/strong\u003e 372-7097\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStemco:\u003c\/strong\u003e 373-0143\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStemco:\u003c\/strong\u003e 373-0243\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Products:\u003c\/strong\u003e P46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeritor:\u003c\/strong\u003e MER0143\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e WS3725A\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Notice:\u003c\/strong\u003e These part numbers are provided for identification and interchange research. Seal dimensions, construction, installation methods, and wheel-end compatibility may vary by manufacturer. Confirm the correct replacement using the original seal number and the wheel-end manufacturer's specifications before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Trailer Wheel Seal\u003c\/h2\u003e\n\n\u003cp\u003eA worn or damaged trailer wheel seal can allow lubricant to leak from the hub assembly or permit contaminants to enter the wheel-end components.\u003c\/p\u003e\n\n\u003cp\u003eCommon warning signs include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eOil leaking around the trailer wheel hub\u003c\/li\u003e\n\u003cli\u003eLubricant collecting on the inside of the wheel or rim\u003c\/li\u003e\n\u003cli\u003eOil contamination around the brake assembly\u003c\/li\u003e\n\u003cli\u003eLow wheel-end lubricant levels\u003c\/li\u003e\n\u003cli\u003eVisible damage to the wheel seal\u003c\/li\u003e\n\u003cli\u003eContaminated wheel bearing lubricant\u003c\/li\u003e\n\u003cli\u003eAbnormal wheel-end heat associated with lubrication problems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eTrailer wheel seal leaks should be inspected promptly. Loss of wheel-end lubricant can contribute to bearing damage, brake contamination, overheating, and potentially serious wheel-end failures.\u003c\/p\u003e\n\n\u003ch2\u003eOTR WS305 Product Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OTR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e WS305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e GS-WS-46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Heavy-Duty Wheel Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Trailer Axle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAxle Rating:\u003c\/strong\u003e 22,500 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Inner Diameter \/ Shaft Diameter:\u003c\/strong\u003e 4.625 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Width:\u003c\/strong\u003e 0.875 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Lip Material:\u003c\/strong\u003e Nitrile Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication Application:\u003c\/strong\u003e Oil Bath\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Family:\u003c\/strong\u003e 46305\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Wheel Seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTrailer Wheel Seal Installation \u0026amp; Maintenance\u003c\/h2\u003e\n\n\u003cp\u003eBefore installing the OTR WS305, inspect the trailer wheel hub, spindle sealing surface, wheel bearings, and related components for damage or excessive wear.\u003c\/p\u003e\n\n\u003cp\u003eUse the correct seal installation tool and follow the trailer axle, hub, and seal manufacturer's procedures. Improper installation can damage the seal and lead to premature lubricant leakage.\u003c\/p\u003e\n\n\u003cp\u003eDuring wheel-end maintenance:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify the original wheel seal part number and dimensions.\u003c\/li\u003e\n\u003cli\u003eInspect the spindle sealing surface for scoring or damage.\u003c\/li\u003e\n\u003cli\u003eCheck hub bore condition and cleanliness.\u003c\/li\u003e\n\u003cli\u003eInspect wheel bearings, races, and related components.\u003c\/li\u003e\n\u003cli\u003eUse the manufacturer-approved wheel-end lubricant.\u003c\/li\u003e\n\u003cli\u003eFollow the proper wheel bearing adjustment procedure.\u003c\/li\u003e\n\u003cli\u003eInspect for lubricant leakage after installation.\u003c\/li\u003e\n\u003cli\u003eCheck brake components for contamination or damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Recommended:\u003c\/strong\u003e Commercial trailer wheel-end assemblies are safety-critical. Improper seal installation, bearing adjustment, or lubrication can lead to serious component damage or failure. Wheel-end service should be performed by qualified technicians using the manufacturer's procedures.\u003c\/p\u003e\n","brand":"OTR","offers":[{"title":"Default Title","offer_id":67683104391213,"sku":null,"price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/WS066_P01_TOP.jpg?v=1792084187"},{"product_id":"hd-value-hdvstd30uc-3030-standard-stroke-brake-chamber","title":"HD Value HDVSTD30UC | 30\/30 Spring Brake Chamber – 13\" Rod","description":"\n\u003ch2\u003eHD Value HDVSTD30UC Type 30\/30 Standard Stroke Spring Brake Chamber – 13-Inch Uncut Pushrod\u003c\/h2\u003e\n\n\u003cp\u003eKeep your commercial truck or trailer braking system operating reliably with the \u003cstrong\u003eHD Value HDVSTD30UC Type 30\/30 Standard Stroke Combination Spring Brake Chamber\u003c\/strong\u003e. Designed for compatible heavy-duty air brake systems, this replacement chamber combines normal service braking and spring-applied parking brake functions in a single assembly.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a \u003cstrong\u003e2.5-inch standard stroke and 13-inch uncut pushrod\u003c\/strong\u003e, the HDVSTD30UC offers a practical replacement solution for commercial truck repair shops, fleet maintenance operations, and owner-operators servicing properly matched Type 30\/30 brake systems.\u003c\/p\u003e\n\n\u003cp\u003eHD Value spring brake chambers are built with heavy-duty components, including a steel pushrod plate, and are designed to meet applicable commercial vehicle braking performance requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number: HDVSTD30UC | Chamber Type: 30\/30 | Standard Stroke: 2.5 Inches | Uncut Pushrod: 13 Inches\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eHD Value HDVSTD30UC Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 30\/30 Combination Chamber:\u003c\/strong\u003e Combines service braking and spring-applied parking brake functions in one assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5-Inch Standard Stroke:\u003c\/strong\u003e Designed for compatible standard-stroke commercial air brake applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13-Inch Uncut Pushrod:\u003c\/strong\u003e Supplied for preparation according to the approved vehicle and brake chamber installation requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction:\u003c\/strong\u003e Built for demanding commercial vehicle operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel Pushrod Plate:\u003c\/strong\u003e Heavy-duty construction designed to support dependable brake actuation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial Braking Standards:\u003c\/strong\u003e Manufacturer literature identifies compliance with applicable FMVSS 121 and SAE brake force test requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValue-Priced Replacement:\u003c\/strong\u003e An economical option for qualifying truck and trailer air brake repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial Fleet Applications:\u003c\/strong\u003e Suitable for maintaining compatible highway and vocational vehicles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-Year Limited Warranty:\u003c\/strong\u003e Manufacturer-listed warranty, subject to applicable terms and conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHeavy-Duty Type 30\/30 Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHD Value HDVSTD30UC spring brake chamber\u003c\/strong\u003e is a combination air brake actuator designed for compatible heavy-duty drum brake systems.\u003c\/p\u003e\n\n\u003cp\u003eA combination spring brake chamber performs two essential functions:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Braking:\u003c\/strong\u003e Compressed air acts on the service diaphragm, moving the pushrod and operating the foundation brake linkage during normal braking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParking and Emergency Braking:\u003c\/strong\u003e An internal power spring applies the parking brake when spring-brake release pressure is removed or becomes insufficient.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCorrect brake chamber sizing, pushrod preparation, and mounting are essential to maintaining the vehicle's intended braking performance.\u003c\/p\u003e\n\n\u003ch2\u003e13-Inch Uncut Pushrod for Brake System Service\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHDVSTD30UC features a manufacturer-advertised 13-inch uncut pushrod\u003c\/strong\u003e for compatible brake chamber replacement applications.\u003c\/p\u003e\n\n\u003cp\u003eUncut pushrods allow qualified technicians to prepare the replacement chamber according to the original brake linkage geometry and applicable service instructions.\u003c\/p\u003e\n\n\u003cp\u003ePushrod length must not be selected or modified by guesswork. Proper preparation requires verification of the mounting configuration, slack adjuster geometry, clevis requirements, and brake manufacturer's installation procedure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e A 13-inch uncut pushrod does not mean that the final installed pushrod length should be 13 inches. The correct configuration must be established for the specific vehicle.\u003c\/p\u003e\n\n\u003ch2\u003eStandard Stroke vs. Long Stroke Brake Chambers\u003c\/h2\u003e\n\n\u003cp\u003eThe HD Value HDVSTD30UC is a \u003cstrong\u003estandard-stroke Type 30\/30 combination brake chamber\u003c\/strong\u003e with a listed 2.5-inch stroke.\u003c\/p\u003e\n\n\u003cp\u003eStandard-stroke and long-stroke brake chambers have different operating travel capabilities, service limits, and application requirements.\u003c\/p\u003e\n\n\u003cp\u003eHD Value also offers the \u003cstrong\u003eHDVLS30UC\u003c\/strong\u003e long-stroke brake chamber, which is a separate product.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not replace a required long-stroke chamber with this standard-stroke model.\u003c\/strong\u003e Verify the original chamber designation before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Heavy-Duty Truck \u0026amp; Trailer Applications\u003c\/h2\u003e\n\n\u003cp\u003eThe HDVSTD30UC is intended for commercial vehicles using compatible Type 30\/30 standard-stroke combination spring brake chambers.\u003c\/p\u003e\n\n\u003cp\u003ePotential applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eClass 7 and Class 8 semi trucks\u003c\/li\u003e\n\u003cli\u003eCommercial truck tractors\u003c\/li\u003e\n\u003cli\u003eHeavy-duty commercial trailers\u003c\/li\u003e\n\u003cli\u003eDry van trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed trailers\u003c\/li\u003e\n\u003cli\u003eVocational trucks\u003c\/li\u003e\n\u003cli\u003eDump trucks\u003c\/li\u003e\n\u003cli\u003eFleet maintenance vehicles\u003c\/li\u003e\n\u003cli\u003eOther compatible commercial vehicles equipped with air-operated drum brakes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Vehicle make, model, and axle rating alone do not establish compatibility. Verify chamber type, stroke, mounting dimensions, air connections, and brake linkage configuration before purchasing.\u003c\/p\u003e\n\n\u003ch2\u003eHD Value HDVSTD30UC Cross References\u003c\/h2\u003e\n\n\u003cp\u003eCommercial truck parts catalogs associate HDVSTD30UC with the following spring brake chamber references:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHD Value:\u003c\/strong\u003e HDVSTD30UC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBendix:\u003c\/strong\u003e K129605\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBendix:\u003c\/strong\u003e NT3030STD78\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEuclid:\u003c\/strong\u003e EGC3030\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHaldex:\u003c\/strong\u003e GC3030\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMGM Brakes:\u003c\/strong\u003e 3430051\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e OTR3030SB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTR:\u003c\/strong\u003e OTR3030SB2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Parts:\u003c\/strong\u003e 3030C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomann:\u003c\/strong\u003e 179.SB3030SHD\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Warning:\u003c\/strong\u003e These are catalog interchange and identification references. Spring brake chambers may differ in pushrod length, clevis arrangement, mounting details, and other installation requirements. Do not assume that every referenced part can be installed without modification. Always verify the complete replacement configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Spring Brake Chamber\u003c\/h2\u003e\n\n\u003cp\u003eAir brake chamber problems should be inspected promptly because they can affect service braking, parking brake operation, and overall commercial vehicle safety.\u003c\/p\u003e\n\n\u003cp\u003eCommon warning signs include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eAudible air leakage near the brake chamber\u003c\/li\u003e\n\u003cli\u003eDifficulty releasing the parking brakes\u003c\/li\u003e\n\u003cli\u003eAbnormal brake application or release\u003c\/li\u003e\n\u003cli\u003eDamaged or corroded brake chamber housing\u003c\/li\u003e\n\u003cli\u003eLoose or damaged mounting components\u003c\/li\u003e\n\u003cli\u003eImproper pushrod travel\u003c\/li\u003e\n\u003cli\u003eFailed brake system inspection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eOther air brake components can produce similar symptoms. Inspect the air supply system, valves, slack adjusters, foundation brakes, and related components before determining the required repair.\u003c\/p\u003e\n\n\u003ch2\u003eHD Value HDVSTD30UC Product Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e HD Value\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HDVSTD30UC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Combination Spring Brake Chamber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamber Size:\u003c\/strong\u003e Type 30\/30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Chamber Size:\u003c\/strong\u003e Type 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Type:\u003c\/strong\u003e Standard Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke Length:\u003c\/strong\u003e 2.50 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvertised Uncut Pushrod Length:\u003c\/strong\u003e 13 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Spacing:\u003c\/strong\u003e 4.75 Inches, Center to Center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Threads:\u003c\/strong\u003e 5\/8-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Stud Length:\u003c\/strong\u003e 1.50 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrake System:\u003c\/strong\u003e Air-Operated Drum Brakes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Heavy-Duty Steel Components\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-Year Limited Warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Brake Chamber\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBrake Chamber Installation \u0026amp; Safety Information\u003c\/h2\u003e\n\n\u003cp\u003eBefore installing the HDVSTD30UC, verify the original chamber's Type 30\/30 designation, standard-stroke requirement, mounting stud spacing, air port arrangement, pushrod configuration, and brake linkage dimensions.\u003c\/p\u003e\n\n\u003cp\u003eThe uncut pushrod must be prepared in accordance with the vehicle and brake manufacturer's approved procedures. Always confirm proper pushrod travel, slack adjuster geometry, and foundation brake operation before returning the vehicle to service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCritical Safety Warning:\u003c\/strong\u003e Spring brake chambers contain powerful compressed springs that can cause severe injury or death if improperly handled. Never cut, open, or disassemble the spring brake housing. Follow the manufacturer's approved caging, removal, installation, and testing procedures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Recommended:\u003c\/strong\u003e Commercial vehicle braking systems are safety-critical. Brake chamber replacement and adjustment should be performed by qualified personnel following approved service instructions.\u003c\/p\u003e\n","brand":"HD Value","offers":[{"title":"Default Title","offer_id":67718644269101,"sku":null,"price":58.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/HDV-HDVSTD30UC_-2.jpg?v=1792693320"},{"product_id":"hd-value-hdv9978-air-spring-hendrickson-s-28929","title":"HD Value HDV9978 Air Spring | Replaces Hendrickson S-28929","description":"\n\u003ch2\u003eHD Value HDV9978 Air Spring – Hendrickson S-28929 Replacement\u003c\/h2\u003e\n\n\u003cp\u003eRestore dependable air suspension performance with the \u003cstrong\u003eHD Value HDV9978 Single Convoluted Air Spring\u003c\/strong\u003e, a heavy-duty replacement air bag designed for compatible commercial truck and trailer air-ride suspension systems.\u003c\/p\u003e\n\n\u003cp\u003eEngineered as a replacement for \u003cstrong\u003eHendrickson S-28929\u003c\/strong\u003e and \u003cstrong\u003eFirestone W01-358-9978\u003c\/strong\u003e applications, this air spring helps support vehicle loads, maintain proper suspension ride height, and absorb road vibration during demanding commercial transportation operations.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a \u003cstrong\u003e12.60-inch maximum diameter and a listed height range of 7.88 to 19.61 inches\u003c\/strong\u003e, the HDV9978 combines heavy-duty rubber construction with corrosion-resistant components for dependable performance in properly matched air suspension assemblies.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're replacing a leaking trailer air bag, repairing a Hendrickson air-ride suspension, or performing preventive fleet maintenance, the HD Value HDV9978 offers a cost-conscious aftermarket replacement option.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number: HDV9978 | Replaces Hendrickson S-28929 | Firestone W01-358-9978\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eHD Value HDV9978 Features \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHendrickson S-28929 Replacement:\u003c\/strong\u003e Designed for compatible Hendrickson trailer suspension applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirestone W01-358-9978 Cross Reference:\u003c\/strong\u003e Associated with the widely used 9978 air spring family.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-Convoluted Design:\u003c\/strong\u003e Heavy-duty air spring construction for compatible commercial vehicle suspension systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Rubber Bellows:\u003c\/strong\u003e Formulated to withstand demanding suspension movement and load fluctuations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOzone and Temperature Resistance:\u003c\/strong\u003e Specialized rubber compound helps resist environmental deterioration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant Components:\u003c\/strong\u003e Electroplated components help protect against corrosion in demanding road environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Suspension Support:\u003c\/strong\u003e Helps maintain proper ride height when installed in a functioning air suspension system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Vibration:\u003c\/strong\u003e Helps isolate road shock and vibration from the vehicle and cargo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial Trailer Applications:\u003c\/strong\u003e Suitable for qualifying dry van, refrigerated, flatbed, and other air-ride trailer suspensions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAftermarket Replacement:\u003c\/strong\u003e Engineered for compatible OEM dimensional and functional requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eReplacement for Hendrickson S-28929 Trailer Air Springs\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHD Value HDV9978\u003c\/strong\u003e is a replacement option for compatible air suspension systems using \u003cstrong\u003eHendrickson S-28929\u003c\/strong\u003e air springs.\u003c\/p\u003e\n\n\u003cp\u003eHendrickson air-ride suspension systems are commonly found on commercial trailers where air springs provide load support while helping reduce road vibration and maintain suspension ride height.\u003c\/p\u003e\n\n\u003cp\u003eReplacing damaged or leaking air springs helps restore the suspension's ability to maintain the proper air pressure and vehicle position.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Hendrickson uses multiple air spring configurations. Verify the original part number, suspension model, mounting arrangement, and air connection locations before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eFirestone W01-358-9978 Cross Reference\u003c\/h2\u003e\n\n\u003cp\u003eThe HDV9978 belongs to the same commonly referenced replacement family as the \u003cstrong\u003eFirestone W01-358-9978\u003c\/strong\u003e air spring.\u003c\/p\u003e\n\n\u003cp\u003eThis makes HDV9978 a useful aftermarket option when repairing compatible commercial trailer air suspension assemblies originally equipped with the specified Firestone or Hendrickson air spring.\u003c\/p\u003e\n\n\u003cp\u003eAlways confirm component dimensions and mounting configuration before treating cross-referenced products as interchangeable.\u003c\/p\u003e\n\n\u003ch2\u003eHeavy-Duty Trailer Air Suspension Applications\u003c\/h2\u003e\n\n\u003cp\u003eThe HD Value HDV9978 is intended for compatible trailer air-ride suspension systems using the S-28929 or W01-358-9978 air spring configuration.\u003c\/p\u003e\n\n\u003cp\u003ePotential applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHendrickson trailer air-ride suspensions\u003c\/li\u003e\n\u003cli\u003eDry van trailers\u003c\/li\u003e\n\u003cli\u003eRefrigerated trailers\u003c\/li\u003e\n\u003cli\u003eFlatbed trailers\u003c\/li\u003e\n\u003cli\u003eCommercial freight trailers\u003c\/li\u003e\n\u003cli\u003eHeavy-duty semi-trailers\u003c\/li\u003e\n\u003cli\u003eFleet trailers with matching suspension assemblies\u003c\/li\u003e\n\u003cli\u003eOther properly matched heavy-duty air suspension applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Trailer brand alone does not guarantee compatibility. Different suspension models may use air springs that appear similar but have different mounting plates, piston designs, air connections, and operating heights.\u003c\/p\u003e\n\n\u003ch2\u003eHeavy-Duty Rubber Bellows \u0026amp; Corrosion Protection\u003c\/h2\u003e\n\n\u003cp\u003eThe HDV9978 features heavy-duty rubber bellows designed to handle repeated suspension movement and load changes.\u003c\/p\u003e\n\n\u003cp\u003eThe manufacturer's listed construction features include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eRubber bellows with a manufacturer-advertised burst pressure exceeding 300 psi\u003c\/li\u003e\n\u003cli\u003eSpecially formulated rubber compound for ozone and temperature resistance\u003c\/li\u003e\n\u003cli\u003eElectroplated components for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eConstruction engineered around compatible OEM fit and function requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Burst pressure is a material performance characteristic and must not be used as the air spring's recommended operating pressure. Always follow the suspension manufacturer's approved operating pressure and load specifications.\u003c\/p\u003e\n\n\u003ch2\u003eHD Value HDV9978 Air Spring Cross References\u003c\/h2\u003e\n\n\u003cp\u003eThe following part numbers are associated with the HDV9978 replacement family in commercial truck and trailer parts catalogs:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHD Value:\u003c\/strong\u003e HDV9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHendrickson:\u003c\/strong\u003e S-28929\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHendrickson:\u003c\/strong\u003e C-28929\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHendrickson:\u003c\/strong\u003e S-29928\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirestone:\u003c\/strong\u003e W01-358-9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirestone:\u003c\/strong\u003e W013589978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinental \/ ContiTech:\u003c\/strong\u003e AS9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinental \/ ContiTech:\u003c\/strong\u003e 67588\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeritor:\u003c\/strong\u003e FS9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomann:\u003c\/strong\u003e 566.ER9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomann:\u003c\/strong\u003e AB1DK23I-A959\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDayton Parts:\u003c\/strong\u003e 352-9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriangle:\u003c\/strong\u003e AS-8959\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorld American:\u003c\/strong\u003e WA01-9978C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference Warning:\u003c\/strong\u003e These numbers are provided for part identification and interchange research. Product configurations can differ across manufacturers and revisions. Confirm mounting dimensions, piston construction, air port location, ride height, and suspension application before purchasing.\u003c\/p\u003e\n\n\u003ch2\u003eSigns of a Failing Trailer Air Spring\u003c\/h2\u003e\n\n\u003cp\u003eAir springs are exposed to repeated suspension movement, road contaminants, changing loads, and environmental conditions. Over time, rubber bellows and mounting components may deteriorate.\u003c\/p\u003e\n\n\u003cp\u003eCommon symptoms of an air spring requiring inspection include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eVisible cracks or dry rot in the rubber bellows\u003c\/li\u003e\n\u003cli\u003eAir leaks around the air spring assembly\u003c\/li\u003e\n\u003cli\u003eTrailer sagging or leaning to one side\u003c\/li\u003e\n\u003cli\u003eSuspension losing ride height while parked\u003c\/li\u003e\n\u003cli\u003eDamaged or corroded mounting components\u003c\/li\u003e\n\u003cli\u003eExcessive vibration or abnormal trailer ride quality\u003c\/li\u003e\n\u003cli\u003eAir suspension system repeatedly cycling to maintain ride height\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eOther suspension components, including air lines, fittings, height control valves, and shock absorbers, may produce similar symptoms. Inspect the complete suspension system before determining the required repair.\u003c\/p\u003e\n\n\u003ch2\u003eHD Value HDV9978 Product Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e HD Value\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HDV9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListed Manufacturer Reference:\u003c\/strong\u003e SP 559978-KP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Suspension Air Spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Single Convoluted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e Compatible Hendrickson Trailer Air-Ride Suspensions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Diameter:\u003c\/strong\u003e 12.60 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListed Height Range:\u003c\/strong\u003e 7.88 to 19.61 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Plate Diameter:\u003c\/strong\u003e 9.00 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Mounting Locations:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Mounting Spacing:\u003c\/strong\u003e 5.50 Inches, Center to Center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Connection Configuration:\u003c\/strong\u003e Top, Dual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRubber Construction:\u003c\/strong\u003e Heavy-Duty Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-Reference:\u003c\/strong\u003e Hendrickson S-28929 \/ Firestone W01-358-9978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Air Spring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAir Spring Installation \u0026amp; Fitment Verification\u003c\/h2\u003e\n\n\u003cp\u003eBefore installing the HD Value HDV9978, verify the original air spring part number, suspension model, mounting plate dimensions, air connection configuration, and required operating height.\u003c\/p\u003e\n\n\u003cp\u003eInspect the air suspension system for worn mounts, damaged hardware, leaking air lines, faulty height control valves, and related components.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCritical Safety Warning:\u003c\/strong\u003e Air suspension systems contain pressurized components and may move unexpectedly when pressure is released or restored. Properly support the vehicle, follow the suspension manufacturer's depressurization procedures, and never work beneath a vehicle supported only by its air suspension.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProfessional Installation Recommended:\u003c\/strong\u003e Commercial trailer suspension systems are safety-critical. Air spring replacement should be performed by qualified technicians following the manufacturer's approved procedures.\u003c\/p\u003e\n","brand":"HD Value","offers":[{"title":"Default Title","offer_id":67718651740205,"sku":null,"price":155.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/HDV9978_-2_20_1.jpg?v=1792695025"}],"url":"https:\/\/performancedieselgroup.com\/collections\/trailer-parts.oembed","provider":"Performance Diesel Group","version":"1.0","type":"link"}