Service bulletins for the 2020 Western Star 4700
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
163 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Suspension are shown. Show all
| TSB-32-020-WST | 2026-03-27. Service bulletin. SUSPENSION. Technical Service Bulletin for TufTrac M12 Bolts |
|---|---|
| SS734-WST | 2024-06-05. Other. SUSPENSION. Service Solution for Thread Spring Pin Suspension Alignment & Installation |
| CALShackle | 2021-01-28. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; SUSPENSION; EQUIPMENT; STEERING. Customer Advisory Letter for Threaded Pin and Bushing. Western Star Trucks built in 2020 with threaded pins and bushings have been found with loose shackles on the rear of the steering axle suspension. The pins are seizing from lack of lube causing the shackle to rotate on the pin. |
| SS1034783REV | 2020-10-19. Service bulletin. SUSPENSION. Revised Service Solution for 20K Detroit Axle King Pin Lube Access. Western Star trucks equipped with 20k Detroit front axles and disc brakes built up to 8/17/2020 do not have sufficient room to access the king pin grease zerk. |
| SBW31-016 | 2020-07-31. Service bulletin. SUSPENSION:REAR; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Western Star Bulletin for Non-Airliner Rear Suspension Crossmember Fastener Change. With the start of production on March 2, 2020, the fasteners used to assemble the non-Airliner rear suspension (bogie) crossmember have changed. The rear suspension bogie crossmember gussets to the C-channel will be assembled with 5/8–18 fasteners. This change includes a revision to a higher friction nut that requires an increase in tightening torque. The new higher friction nut can be identified by its green color. |
| WP20-001REV | 2020-02-15. Service bulletin. POWER TRAIN; LANE DEPARTURE; SUSPENSION; EQUIPMENT. Revision to a Warranty Policy Letter announcing the One Stop Supplier Extended Program Launch. The One Stop Supplier Extended Program streamlines the claim filing process because with One Stop Supplier Extended, the service network will file claims for some supplier-supported coverages in OWL. Revisions are in blue. |
| WP20-001 | 2020-01-21. Service bulletin. UNKNOWN OR OTHER; POWER TRAIN; SUSPENSION; LANE DEPARTURE. Warranty Policy Letter announcing the One Stop Supplier Extended Program Launch. The One Stop Supplier Extended Program streamlines the claim filing process because with One Stop Supplier Extended, the service network will file claims for some supplier-supported extended coverages in OWL. |
| CAL WST 32-002 | 2019-12-02. Service bulletin. EQUIPMENT; SUSPENSION; EQUIPMENT ADAPTIVE/MOBILITY. Customer Advisory Letter for Airliner welded axle seats. The welded axle seats were installed incorrectly on the rear most drive axle for specific vehicles resulting in an incorrect axle pinion angle. The existing welded axle seats will be removed and replaced with new axle seats installed in the correct orientation. |
| SBW41-002 | 2019-11-21. Service bulletin. SUSPENSION; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. Service Bulletin for midship bearing replacement. This procedure applies to all vehicles built with driveshafts SPL140, SPL170 or SPL250 with first order driveline vibration. |
| SBW32-018 | 2019-11-21. Service bulletin. EQUIPMENT; SUSPENSION:REAR. Service Bulletin for Hendrickson HaulMaax Rear Suspension Transverse Torque Rod Tower Bracket Replacement. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.