Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 526 bulletins for WESTERN STAR
SS1034577
Dec 2, 2019
100000 POWER TRAIN
Service Solution to address WST Cab drone / vibration / tapping Under acceleration for vehicles w/Eaton Manual Trans.
SS1034579
Dec 2, 2019
350000 EQUIPMENT
Service Solution for prematurely failing coolers on WST Models equipped with Allison Transmissions and Rocore Transmission coolers (07-23256-001) with tow pin front X-member. Part number 07-25266-000 is a direct replacement of the failing c
SBW00-004
Nov 22, 2019
355200 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
Revised Western Star Service Bulletin for Western Star Technical Modification Policy. Description of Revisions: This bulletin replaces the version dated 12/09/2021. The model list has been updated.
CALWS15-001
Nov 21, 2019
060000 ENGINE (PWS)
Customer Advisory Letter for Allison flex plate mounting bolts. The incorrect flex plate mounting bolts were installed for certain vehicles.
SS1034538
Nov 21, 2019
120000 EXTERIOR LIGHTING
Service Solution concerning Western Star 5700 intermittent headlight issues.
TS1034570
Nov 21, 2019
060000 ENGINE AND ENGINE COOLING
Training Solution provides information related to the new Microgateway (MGW) found on Western Star 4700 Cummins Applications.
OLFL821-Emission
Nov 20, 2019
060000 ENGINE AND ENGINE COOLING
Owner's Letter for emissions recall FL821 for Western Star 4900 exhaust pipes emitting excess pollutants. Pipe support brackets lacks durability and may cause pipe to crack at bellows and weld breaks to occur at the flange.
P&SNOV19
Nov 20, 2019
355200 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
Parts and Service committee meeting minutes for Western Star
SBW41-002
Nov 20, 2019
020000 SUSPENSION
Revised Western Star Service Bulletin for Drive Line Vibration. Minor note: added an update of document previously submitted. The related VMRS codes are added
SBW32-018
Nov 20, 2019
022000 SUSPENSION:REAR
Service Bulletin for Hendrickson HaulMaax Rear Suspension Transverse Torque Rod Tower Bracket Replacement.
FL821
Nov 19, 2019
063000 ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
Emissions Recall for Western Star 4900 exhaust pipes emitting excess pollutants. Pipe support brackets lacks durability and may cause pipe to crack at bellows and weld breaks to occur at the flange.
SS1034499
Oct 30, 2019
110000 ELECTRICAL SYSTEM
Service Solution on failing RX modules in Western Star vehicles.
CAL_WS_42001
Oct 29, 2019
040000 SERVICE BRAKES, AIR
Customer Advisory Letter for WABCO HP air dryer turbo cut-off valve replacement.
SS1034531
Oct 29, 2019
040000 SERVICE BRAKES, AIR
Service Solution for WABCO HP air dryer turbo cut-off valve replacement.
SBW98-1
Oct 29, 2019
160000 STRUCTURE
Service bulletin updating the Important Information section and adding instructions for proper visual inspection distance for paint finish standards.
DOC-1034500
Sep 30, 2019
060000 ENGINE AND ENGINE COOLING
Service Solution to fix AC cooling performance due to improper HVAC function.
SBW54-073
Sep 27, 2019
110000 ELECTRICAL SYSTEM
Service Bulletin for Powernet Distribution Box Functional Changes
SB47-015
Sep 27, 2019
070000 FUEL SYSTEM, GASOLINE
Service Bulletin for Equiflo Fuel System Breather Tube Inspection
SB35-016
Sep 27, 2019
100000 POWER TRAIN
Service Bulletin for Hub Oil Level in Final Drive (NFD) Top Performance Axles on Decked Vehicles
CAL WS 46-001
Sep 6, 2019
010000 STEERING
Customer Advisory Letter for Steering Column Pinch Bolt Inspection
sbw54072
Aug 6, 2019
060000 ENGINE AND ENGINE COOLING
Service Bulletin sent out to customers to repair damaged MCM 21-pin connector, terminals, and minor wiring.