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Other SS778-WST

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)
TypeOther
NHTSA id11013219
Published by NHTSA2025-01-29
Manufacturer's numberSS778-WST
Manufacturer's date2025-01-14
NHTSA componentSTEERING

NHTSA's summary

Service Solution for Power Steering Reservoir Fill Cap Venting

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

Steering

Vehicles listed
WESTERN STAR 47002015, 2016, 2017, 2018, 2019, 2020, 2021, 2022
WESTERN STAR 47X2023 to 2025
WESTERN STAR 49X2017 to 2025
WESTERN STAR 57002015, 2016, 2017, 2018, 2019, 2020, 2021, 2022
WESTERN STAR 57X2021 to 2025

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

Recalls for the same vehicles and component
20232062023-04-05. Steering
22V7220002022-09-28. STEERING:LINKAGES:TIE ROD ASSEMBLY
20213042021-05-19. Steering
21V3690002021-05-19. STEERING:LINKAGES:TIE ROD ASSEMBLY
20212192021-04-12. Steering
21V2560002021-04-12. STEERING:LINKAGES:TIE ROD ASSEMBLY; STEERING:CRITICAL FASTENERS
20195392019-10-25. Steering
19V7690002019-10-25. STEERING
20187192018-12-20. Steering
18V9130002018-12-19. SUSPENSION:FRONT:CONTROL ARM; STEERING:LINKAGES:TIE ROD ASSEMBLY; STEERING

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
PB33-005-WST2025-07-08. Service bulletin. Parts Bulletin for Tie Rod Assembly Part Breakdown
TechTalk71552021-02-03. Service bulletin. Tech Talk discussion on 2020 Western Star, TRW Power Steering Whine.
CALShackle2021-01-28. Service bulletin. 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.
WP20-018R2020-12-12. Service bulletin. Revised Warranty Policy Letter for Alliance/Mascot Aftermarket Warranty and Claim Filing. Revisions are in blue. With Mascot now in partnership with Detroit Reman and Alliance Parts, DTNA is pleased to announce that Mascot coverage has been added to OWL. Remanufactured Alliance/Mascot parts include transmission, differential, steering gear, and steering pump used in an on-highway vehicle applications. The Alliance/Mascot aftermarket warranty coverage period has not changed: depending on the part, coverage is for one (1) or two (2) years and current parts, labor, and reimbursement policies apply.
WP20-0182020-12-12. Service bulletin. Warranty Policy Letter for Alliance/Mascot Aftermarket Warranty and Claim Filing. With Mascot now in partnership with Detroit Reman and Alliance Parts, DTNA is pleased to announce that Mascot coverage has been added to OWL. Remanufactured Alliance/Mascot parts include transmission, differential, steering gear, and steering pump used in an on-highway vehicle applications. The Alliance/Mascot aftermarket warranty coverage period has not changed: depending on the part, coverage is for one (1) or two (2) years and current parts, labor, and reimbursement policies apply.
TechTalk22092020-12-01. Service bulletin. Tech Talk discussion on TRW GEAR-STRG,THP60,1200RAD,AB,ST. Steering exhibits shutter when turning left.
TechTalk47252020-09-30. Service bulletin. Tech Talk discussion about power steering fluid.
CALWST46-0022020-09-01. Service bulletin. Customer Advisory Letter for Torque Validation of Steering Wheel Mounting Bracket Bolts. Western Star 4700 & 4900 vehicles equipped with a certain steering wheel mounting bracket bolt installation may have a low toque value setting.
CALWST46-0022020-08-08. Service bulletin. Customer Advisory Letter for Torque Validation of Steering Wheel Mounting Bracket Bolts. Western Star 4700 & 4900 vehicles equipped with a certain steering wheel mounting bracket bolt installation may have a low toque value setting.
SBW54-074REV2020-03-25. Service bulletin. Revision for Service Bulletin for Western Star 5700 Pana-Pacific 540 Radio Controls Not Operating Normally. This bulletin replaces the version dated 02/07/2020. Pana-Pacific DEA540 radios (A22-74389-000, A22-77161-000) may cease to respond to volume control settings from the steering wheel switches or the controls on the radio faceplate, resulting in erratic volume control. Information about the firmware version this SB applies to has been included, the 4700 was added to the model list, and part numbers have been corrected.