PB_633

Title:
Severe Duty Suspension Torque Rod Replacement
Number:
PB_633
Release Date:
6/20/2023
Revision Number:
Not Applicable
Revision Date:
Not Applicable
Chassis Type:
All Custom Chassis Equipped with Air Ride, Rubber Spring, and
Steel Tandem Spring Suspension Systems
Component Description:
Hendrickson® TRAAX ROD® Torque Rods
Warranty:
Not Applicable
Parts:
Not Applicable
Tools:
Not Applicable
Subject:
Current air ride suspension system torque rods are being replaced with Hendrickson® TRAAX ROD® torque rods
to handle more demanding suspension loads for severe-duty applications.
Purpose:
This bulletin will provide instruction to measure current torque rod specifications to ensure that the correct
Hendrickson® TRAAX ROD® torque rods and shims (if applicable) are ordered for replacement, if desired to
change to. These torque rods and their bushings have a significantly increased component life for severe-duty
applications versus standard torque rods and bushings.
Procedure:
1.
2.
3.
4.
Measure center of bushing eye to center of bushing eye.
Determine length in millimeters.
If the length does not end in 0mm or 5mm, round down to the nearest increment.
Use Hendrickson® TRAAX ROD® Smart Numbering System (See Figure 1) to determine torque rod
specifications.
5. Open a technical support incident on Pierceparts.com to get the appropriate torque rods ordered.
NOTE:
 Suspension system should be inspected annually. If you notice excessive wear of torque rod
bushings, please open a technical support incident on Pierceparts.com for replacement parts.

Hendrickson® TRAAX ROD® torque rods lengths are measured in increments of 5mm. If torque
rod measurement is not an increment of 5mm, round down to the nearest 5mm increment.

Depending on length of torque rods, shims may be required to be installed with torque rods. If
required, these shims (Pierce P/N: 82-1032-0063 or 82-1032-0088, depending on suspension
rating) need to be ordered with the torque rods.
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PARTS BULLETIN 633
Figure 1
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