Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 526 bulletins for WESTERN STAR
SS1034783
Aug 21, 2020
100000 POWER TRAIN
Service Solution for 20K Detroit Axle King Pin Lube Access. WST 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.
SBW26-004
Aug 14, 2020
100000 POWER TRAIN
Western Star Service Bulletin for DT12 Transmission Cooler Retrofit.
SBW42-013
Jul 30, 2020
034420 SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM:SHOES/LININGS
Western Star Service Bulletin for Meritor Steer Axle Drum Brake Squeal. Some Western Star 5700 vehicles equipped with Meritor steer axle drum brakes with a front axle rating less than 13,300 lb (6038 kg) have experienced brake squealing noi
CALWST46-002
Jul 30, 2020
010000 STEERING
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.
SBW31-016
Jul 28, 2020
022000 SUSPENSION:REAR
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 su
SBW60-027
Jul 13, 2020
355200 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
Service Bulletin for Guidelines for Cleaning and Disinfecting Cab Surfaces. The following guidelines are for cleaning and disinfecting commonly touched surfaces on the inside and outside of a vehicle. For best results, follow cleaning and d
SBW31-015
Jun 29, 2020
162310 STRUCTURE:BODY:DOOR:HINGE AND ATTACHMENTS
Western Star Service Bulletin for Chassis Side-Fairing Kickplate Magnet Replacement. On Freightliner Cascadia and New Cascadia vehicles manufactured before May 20, 2019, and equipped with side-fairings, the magnets that hold the kickplate c
SS1034711
May 22, 2020
135000 VISIBILITY:REARVIEW MIRRORS/DEVICES
Service Solution for Hadley Upper Mirror Glass Vibration. The following suggestions are not guaranteed to eliminate or fix the Hadley mirror vibration concern. We have had mixed results in field-testing. In some cases, these solutions elimi
SBW72-008REV
May 22, 2020
133000 VISIBILITY:POWER WINDOW DEVICES AND CONTROLS
Service Bulletin for Window Regulator Retrofit. The bulletin dated December 4, 2019 has been revised to include 4800 Models. Beginning 04/01/2019 Western Star cab doors were updated to a new style regulator and window. When replacing an old
SBW54-075
Apr 17, 2020
110000 ELECTRICAL SYSTEM
Service Bulletin for Lengthening the Backup Light Harness. Though the back-up light harness is long enough to connect to the backup light switch, it may be short enough that the wire seals in the connector can be stressed. Moisture entering
CALWS54-002
Mar 30, 2020
110000 ELECTRICAL SYSTEM
Customer Advisory Letter for 6TS RP1226 Dash Harness Circuit Correction. Western Star model 4700 and 5700 vehicles may have reversed terminals 1 and 7 in the 14 pin connector on the A66-12703-000 harness for 6TS that offers the RP1226 conne
SBW54-074REV
Mar 25, 2020
010000 STEERING
Revision for Service Bulletin for Western Star 4700/5700 Pana-Pacific 540 Radio Controls Not Operating Normally. This bulletin replaces the version dated 03/25/2020. Pana-Pacific DEA540 radios (A22-74389-000, A22-77161-000) may cease to res
SS1034179
Feb 19, 2020
110000 ELECTRICAL SYSTEM
Service Solution on Western Star speedometers. For certain speedometers the speedometer may drop out or the odometer may reset to zero.
SBW54-074
Feb 14, 2020
350000 EQUIPMENT
Revised Western Star Service Bulletin for Pana-Pacific 540 Radio Controls Not Operating Normally. Minor note: added an update of document previously submitted. The related VMRS codes are added
SBW54-061
Feb 14, 2020
110000 ELECTRICAL SYSTEM
Service Bulletin for Guidelines for Repairing or Replacing an Electrical Harness. Use the guidelines in this bulletin to determine if a damaged electrical harness should be repaired or replaced.
SS1034615
Jan 21, 2020
130000 VISIBILITY
Service Solution for Western Star Velvac Door Mirror Seal Curling. The rubber that is rolling back is actually a rubber tape. Originally, the mirrors did not have this tape. Velvac added the tape to address some whistling complaints from cu
SS1034621
Jan 20, 2020
020000 SUSPENSION
Service Solution for Western Star vehicles equipped with Hendrickson AIRTEK Axles experiencing a Harsh Ride.
SS1034607
Jan 20, 2020
160000 STRUCTURE
Service Solution for WST 4700 In Cab Floor Raceway Cover Corrosion. Some Western Star 4700 trucks experience rust through of the steel raceway covers located on the cab floor. This is typically seen in applications where the truck is run in
SS1034606
Jan 17, 2020
350000 EQUIPMENT
Service Solution for WST for some Western Star 4700 trucks equipped with PTO where when the driver's door is opened the PTO will disengage.
SBW83-020
Jan 16, 2020
130000 VISIBILITY
Service Bulletin on A/C System Receiver-Drier Replacement Guidelines.
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