HD Value HDV9781 Air Spring | Freightliner Cascadia – Aluminum Base

HD Value HDV9781 Air Spring – Freightliner Cascadia, Aluminum Base

Restore your truck's air suspension performance with the HD Value HDV9781 Air Spring with Aluminum Base, a heavy-duty replacement air bag designed for compatible Freightliner Cascadia, Columbia, Century, Coronado, Sterling, and Western Star air suspension applications.

Featuring a durable rubber bellows and aluminum piston base, the HDV9781 helps support vehicle loads, maintain proper suspension ride height, and reduce road vibration during demanding commercial trucking operations.

Designed for compatible Freightliner AirLiner suspension configurations, this air spring is associated with Freightliner 16-13840-000, Firestone W01-358-9781, Goodyear 1R12-603, and ContiTech AS9781 replacement applications.

Whether you're replacing a leaking rear suspension air bag on a Freightliner Cascadia, repairing an air-ride suspension system, or maintaining a fleet of heavy-duty trucks, the HD Value HDV9781 provides a cost-effective aftermarket replacement option when its specifications match the original air spring.

Part Number: HDV9781 | Aluminum Base | Compatible Freightliner AirLiner Applications

HD Value HDV9781 Features & Benefits

• Freightliner Cascadia Applications: Designed for compatible Cascadia rear air suspension configurations.
• Aluminum Piston Base: Features an aluminum lower base for applications requiring this configuration.
• Heavy-Duty Rubber Bellows: Engineered to withstand repeated suspension movement and changing vehicle loads.
• Freightliner AirLiner Compatibility: Associated with selected Freightliner rear air-ride suspension systems.
• Ride Height Support: Helps maintain proper suspension ride height when installed in a functioning air suspension system.
• Vibration Isolation: Helps absorb road shock and reduce vibration transmitted through the truck chassis.
• Ozone and Temperature Resistance: Specially formulated rubber compound helps resist environmental deterioration.
• Corrosion-Resistant Components: Electroplated components help protect against corrosion.
• Aftermarket Replacement: Engineered around compatible OEM appearance, form, fit, and functionality requirements.
• Commercial Truck Applications: Suitable for qualifying Freightliner, Sterling, and Western Star air suspension systems.

Freightliner Cascadia Air Spring Replacement

The HD Value HDV9781 air spring is a replacement option for certain Freightliner Cascadia trucks equipped with compatible aluminum-base rear air suspension assemblies.

Air springs play an important role in maintaining vehicle ride height and isolating the chassis from road vibration. Proper suspension performance helps maintain vehicle stability, driving comfort, and suspension component operation.

Common symptoms of a worn air spring include air leaks, uneven suspension height, deteriorated rubber bellows, or a truck that loses ride height while parked.

Replacing a damaged air spring with a correctly matched component helps restore the suspension system's intended performance.

Important: Not all Freightliner Cascadia trucks use the same air spring. Confirm the original part number, VIN, suspension model, and aluminum-base configuration before ordering.

Aluminum Base Air Spring – Why It Matters

The HDV9781 features an aluminum piston base, which is a key characteristic when matching the replacement air spring to the original suspension assembly.

Air springs may have aluminum, steel, or composite piston bases, and similar-looking products can have different mounting arrangements and suspension geometry.

The HDV9781 should be selected for applications requiring its specific aluminum-base configuration, dimensions, and mounting arrangement.

Do not assume aluminum-base and composite-base air springs are interchangeable. Always verify the original part number and suspension requirements.

Compatible Freightliner & Commercial Truck Applications

The HD Value HDV9781 is associated with compatible Freightliner AirLiner and related heavy-duty truck air suspension configurations.

Potential vehicle applications include:

• Freightliner Cascadia
• Freightliner Columbia
• Freightliner Century Class
• Freightliner Coronado
• Freightliner Classic
• Other compatible Freightliner highway tractors
• Selected Sterling commercial trucks
• Selected Western Star commercial trucks

Fitment Note: These are potential vehicle applications, not guaranteed fitments for every model year or suspension package. Compatibility depends on the original air spring part number, installed suspension model, and mounting specifications.

Freightliner AirLiner Suspension Performance

Freightliner AirLiner suspension systems use air springs to help carry vehicle loads while providing suspension movement and ride comfort.

When correctly installed in a compatible suspension system, the HDV9781 helps support:

• Proper rear suspension ride height
• Consistent suspension movement
• Reduced chassis vibration
• Vehicle load support within approved suspension ratings
• Improved ride comfort over uneven road surfaces

Complete suspension performance also depends on properly functioning height control valves, air lines, shock absorbers, bushings, and mounting components.

HD Value HDV9781 Air Spring Cross References

The following part numbers are associated with the HDV9781 air spring replacement family in commercial truck parts catalogs:

• HD Value: HDV9781
• Manufacturer Reference: SP 559781-KA
• Freightliner: 16-13840-000
• Freightliner: 16-16773-000
• Freightliner: A16-14004-000
• Freightliner: 681-320-0017
• Firestone: W01-358-9781
• Goodyear: 1R12-603
• Goodyear: 1R12-1082
• ContiTech: AS9781
• ContiTech: 64266
• ContiTech: 910S-16A382
• Automann: AB1DF23-9781
• Meritor: FS9781
• Meritor: MAF9781
• Power Products: 889781
• World American: WA01-9781C
• Alliance: ABP N32 019781

Cross-Reference Warning: These are catalog interchange references for part identification. Some products may have different piston materials, mounting details, or suspension requirements. Verify the original part number, mounting dimensions, and suspension configuration before treating any cross-reference as a direct replacement.

Signs of a Failing Freightliner Air Spring

Over time, air springs can deteriorate from repeated suspension movement, changing loads, environmental exposure, and road conditions.

Common warning signs include:

• Truck sitting low or leaning to one side
• Audible air leaks from the air spring or fittings
• Cracks, cuts, or dry rot in the rubber bellows
• Suspension losing ride height while parked
• Air compressor cycling more frequently than normal
• Harsh ride quality or increased chassis vibration
• Damaged or corroded mounting components
• Visible damage to the aluminum piston base

Other air suspension components can cause similar symptoms. Inspect the complete system before determining the required repair.

HD Value HDV9781 Product Specifications

• Brand: HD Value
• Part Number: HDV9781
• Manufacturer Reference: SP 559781-KA
• Product Type: Heavy-Duty Suspension Air Spring
• Design: Rolling-Lobe Air Spring
• Lower Base Material: Aluminum
• Maximum Diameter: 12.60 Inches
• Advertised Overall Height Range: 8.24 to 23.16 Inches
• Separately Listed Compressed Height: 7.80 Inches
• Piston Height: 6.48 Inches
• Top Plate Diameter: 9.00 Inches
• Air Connection: Top, Single
• Primary Application: Compatible Freightliner AirLiner and Related Suspensions
• Firestone Reference: W01-358-9781
• Goodyear Reference: 1R12-603
• Quantity: 1 Air Spring

Air Spring Installation & Fitment Verification

Before installing the HD Value HDV9781, verify the original air spring part number, suspension model, aluminum piston configuration, mounting plate dimensions, air inlet location, and required operating ride height.

Inspect air lines, fittings, height control valves, shock absorbers, brackets, and other suspension components for damage or wear.

Critical Safety Warning: Air suspension systems contain pressurized components and may move unexpectedly when pressure is released or restored. Properly support the vehicle and depressurize the suspension according to the manufacturer's procedures. Never work beneath a vehicle supported only by its air suspension.

Professional Installation Recommended: Heavy-duty truck suspension components should be installed by qualified technicians following approved manufacturer service instructions.