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Service bulletin SS1034621

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10170323
Published by NHTSA2020-01-21
Manufacturer's numberSS1034621
Manufacturer's date2020-01-20
NHTSA componentSUSPENSION

NHTSA's summary

Service Solution for Western Star vehicles equipped with Hendrickson AIRTEK Axles experiencing a Harsh Ride.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Suspension

Vehicles listed
WESTERN STAR 48002004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
WESTERN STAR 49002004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
WESTERN STAR 57002004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20V5390002020-09-03. SUSPENSION:MULTIPLE AXLE
18V9130002018-12-19. SUSPENSION:FRONT:CONTROL ARM; STEERING:LINKAGES:TIE ROD ASSEMBLY; STEERING
20174072017-08-24. Suspension
17V5210002017-08-24. SUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY
12V2660002012-06-12. SUSPENSION:FRONT
20114072011-11-17. Suspension
07V3160002007-07-24. SUSPENSION:REAR
20072302007-07-11. Suspension
20060842006-04-19. Suspension

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
TSB-32-020-WST2026-03-27. Service bulletin. Technical Service Bulletin for TufTrac M12 Bolts
SS734-WST2024-06-05. Other. Service Solution for Thread Spring Pin Suspension Alignment & Installation
TechTalk77422020-12-04. Service bulletin. Tech Talk discussion on loose rear spring shackle bushings in the springs causing steer axle to shift on pins. New comments added.
TechTalk77422020-11-03. Service bulletin. Tech Talk discussion on loose rear spring shackle bushings in the springs causing steer axle to shift on pins,
SS1034783REV2020-10-19. Service bulletin. 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.
SBW31-0162020-07-31. Service bulletin. 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.
WP20-001REV2020-02-15. Service bulletin. 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.
WP20-0012020-01-21. Service bulletin. 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 32-0022019-12-02. Service bulletin. 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.
SBW41-0022019-11-21. Service bulletin. Service Bulletin for midship bearing replacement. This procedure applies to all vehicles built with driveshafts SPL140, SPL170 or SPL250 with first order driveline vibration.