OTR WS305 Wheel Seal | 22,500 lb Trailer Axles

OTR WS305 Wheel Seal for 22,500 lb Trailer Axles

Protect your commercial trailer's wheel bearings and hub assemblies with the OTR WS305 Wheel Seal for 22,500 lb Trailer Axles. 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.

Featuring durable nitrile rubber sealing material, 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.

Whether you're repairing a leaking trailer wheel seal, replacing wheel bearings, or performing preventive maintenance on a commercial trailer, the OTR WS305 provides an aftermarket replacement option for properly matched 46305-family wheel-end applications.

Part Number: WS305 | Manufacturer Reference: GS-WS-46305

OTR WS305 Features & Benefits

• 22,500 lb Trailer Axle Application: Designed for compatible heavy-duty commercial trailer axles.
• Oil-Bath Wheel Seal: Helps retain wheel-end lubricant inside the hub assembly.
• Nitrile Rubber Sealing Material: Designed for demanding commercial vehicle wheel-end conditions.
• Contamination Protection: Helps reduce the entry of dirt, dust, road debris, and moisture into the hub.
• Lubricant Retention: Helps prevent oil leakage when correctly installed in a compatible wheel-end assembly.
• Wheel Bearing Protection: Supports proper lubrication of trailer wheel bearings and related components.
• Heavy-Duty Replacement: Suitable for qualifying commercial trailer maintenance and repairs.
• Service-Friendly Installation: Designed for installation using appropriate seal-driving tools and manufacturer-approved procedures.
• Fleet Maintenance Applications: Practical for trailer repair shops, commercial fleets, and owner-operators.

Heavy-Duty Trailer Wheel Seal for Commercial Trucks

The OTR WS305 trailer axle wheel seal helps maintain proper lubrication inside compatible commercial trailer wheel-end assemblies.

Wheel seals are essential components of the hub system because they help retain lubricant around the wheel bearings while preventing contaminants from entering the assembly.

A correctly installed wheel seal helps:

• Retain wheel bearing lubricant inside the trailer hub
• Reduce oil leaks around the wheel-end assembly
• Protect wheel bearings from dirt and moisture
• Support consistent wheel-end lubrication
• Help prevent lubricant-related bearing damage
• Maintain dependable commercial trailer operation

Designed for Compatible 22,500 lb Trailer Axles

The OTR WS305 is intended for compatible 22,500 lb rated trailer axles using the required 46305-family wheel seal configuration.

Potential applications include:

• Heavy-duty semi-trailers
• Dry van trailers
• Refrigerated trailers
• Flatbed trailers
• Commercial freight trailers
• Vocational trailers
• Fleet trailers with compatible wheel-end assemblies
• Other commercial trailer axles requiring the specified wheel seal

Important: 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.

Oil-Bath Wheel Seal for Trailer Hub Assemblies

The 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.

The seal helps maintain a protective barrier between the lubricated wheel-end assembly and the external road environment.

For dependable performance, always use the correct wheel-end lubricant and follow the axle or hub manufacturer's service instructions.

Nitrile Rubber Sealing Material

The OTR WS305 features nitrile rubber sealing material designed to provide durable sealing performance in approved commercial vehicle applications.

The sealing material helps resist normal exposure to wheel-end lubricants while supporting a barrier against dirt and environmental contaminants.

Correct seal installation, bearing adjustment, and hub condition are critical to the performance of the complete wheel-end assembly.

OTR WS305 Wheel Seal Cross References

The OTR WS305 is associated with the 46305 wheel seal family. Common commercial truck parts catalog interchange references include:

• OTR: WS305
• OTR Manufacturer Reference: GS-WS-46305
• SKF: 46305
• SKF: CR46305
• National: 370025A
• National: 380025A
• Stemco: 372-7097
• Stemco: 373-0143
• Stemco: 373-0243
• Power Products: P46305
• Meritor: MER0143
• OTR: WS3725A

Cross-Reference Notice: 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.

Signs of a Failing Trailer Wheel Seal

A worn or damaged trailer wheel seal can allow lubricant to leak from the hub assembly or permit contaminants to enter the wheel-end components.

Common warning signs include:

• Oil leaking around the trailer wheel hub
• Lubricant collecting on the inside of the wheel or rim
• Oil contamination around the brake assembly
• Low wheel-end lubricant levels
• Visible damage to the wheel seal
• Contaminated wheel bearing lubricant
• Abnormal wheel-end heat associated with lubrication problems

Trailer 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.

OTR WS305 Product Specifications

• Brand: OTR
• Part Number: WS305
• Manufacturer Part Number: GS-WS-46305
• Product Type: Heavy-Duty Wheel Oil Seal
• Application: Trailer Axle
• Axle Rating: 22,500 lb
• Seal Inner Diameter / Shaft Diameter: 4.625 Inches
• Seal Width: 0.875 Inches
• Seal Lip Material: Nitrile Rubber
• Lubrication Application: Oil Bath
• Seal Family: 46305
• Quantity: 1 Wheel Seal

Trailer Wheel Seal Installation & Maintenance

Before installing the OTR WS305, inspect the trailer wheel hub, spindle sealing surface, wheel bearings, and related components for damage or excessive wear.

Use 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.

During wheel-end maintenance:

• Verify the original wheel seal part number and dimensions.
• Inspect the spindle sealing surface for scoring or damage.
• Check hub bore condition and cleanliness.
• Inspect wheel bearings, races, and related components.
• Use the manufacturer-approved wheel-end lubricant.
• Follow the proper wheel bearing adjustment procedure.
• Inspect for lubricant leakage after installation.
• Check brake components for contamination or damage.

Professional Installation Recommended: 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.