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: Steering are shown. Show all
| PB33-005-WST | 2025-07-08. Service bulletin. STEERING. Parts Bulletin for Tie Rod Assembly Part Breakdown |
|---|---|
| SS778-WST | 2025-01-29. Other. STEERING. Service Solution for Power Steering Reservoir Fill Cap Venting |
| TechTalk7155 | 2021-02-03. Service bulletin. STEERING. Tech Talk discussion on 2020 Western Star, TRW Power Steering Whine. |
| 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. |
| WP20-018R | 2020-12-12. Service bulletin. STEERING; POWER TRAIN. 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. |
| WP20-018 | 2020-12-12. Service bulletin. STEERING; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; POWER TRAIN. 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. |
| TechTalk4725 | 2020-09-30. Service bulletin. STEERING; EQUIPMENT. Tech Talk discussion about power steering fluid. |
| SBW54-074REV | 2020-03-25. Service bulletin. STEERING; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. 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. |
| CAL WS 46-001 | 2019-09-07. Service bulletin. STEERING. Customer Advisory Letter for Steering Column Pinch Bolt Inspection |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.