Description

Overview

The Western Star rear air suspension shock absorber controls axle movement on compatible heavy-duty rear suspension systems. It matches the M85724 shock family used with selected Western Star Airliner and FAS II applications, helping control compression and rebound as the rear suspension moves through its travel.

Features

• Rear suspension shock for compatible Western Star applications
• Eye-to-eye mounting configuration
• Hydraulic stop to control suspension extension
• Heavy-duty chassis shock with protective dust shield

Specifications and Materials

Extended length: 570mm.

Collapsed length: 371mm.

Stroke: 199mm.

Body diameter: 70mm.

Dust shield diameter: 80mm.

Part number: 502.749.

See the Meritor M85724 shock absorber technical information

Compatibility and Fitment

Suitability includes selected Western Star 4700SB, 4700SF, 47X, 49X, 5700XE and 57X configurations using the matching rear air suspension. Compare the existing shock reference, eye mounts and extended and collapsed lengths before replacement. This part should not be selected as a front shock simply from the vehicle model alone.

These cross-references show where this part replaces the part numbers and applications listed. Some installations may need minor changes.

M85724, 85724, 65490, 74425, A85724, AMS700423, 16-13957-000, 1613957000, 1613957003, 16-15817-000, 1615817000, 16-18708-000, 1618708000, 471700002809, 481700006848, 680339, 680611, 61310434, 61310478, SA74425, 315395, 341628, 441602, SA5724, 83176235, 3946239, 8805-1022, 8901029, HS85724, SDA471700002809

Compliance and Safety

Support the chassis and suspension correctly before removing the shock. Inspect both mounting eyes, sleeves, bolts and brackets for looseness, wear or distortion, then replace damaged mounting hardware before the vehicle returns to service.

Trailer Applications

The Western Star rear air suspension shock absorber suits heavy-vehicle suspension repairs where the existing M85724-style damper is leaking, damaged or no longer controlling rear axle movement correctly. Its 570mm extended and 371mm collapsed lengths are important checks when distinguishing it from other Western Star shock applications.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Why Choose ICS Trailers

The important selection check on this shock is its rear air suspension application, mounting style and working length. A Western Star model can use different dampers depending on suspension specification, so compare the old shock number and eye-to-eye dimensions rather than ordering from the truck badge alone. If the markings are unreadable, send through the truck model, suspension type and photos of both shock mounts so ICS Trailers can help narrow down the match.

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