# Service bulletin TechTalk7155

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.

- Type: Service bulletin
- NHTSA id: 10186610
- Published by NHTSA: 2021\-02\-03
- Manufacturer's number: TechTalk7155
- Manufacturer's date: 2021\-01\-19
- NHTSA component: STEERING

## NHTSA's summary

Tech Talk discussion on 2020 Western Star, TRW Power Steering Whine.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186610-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186610-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Steering

## Vehicles listed

- 2020 FREIGHTLINER 114SD
- 2020 WESTERN STAR 4700

## Recalls for the same vehicles and component

- [2023083](/recalls/tc/2023083.md), 2023-02-20: Steering
- [23V105000](/recalls/nhtsa/23V105000.md), 2023-02-20: STEERING:LINKAGES:DRAG:LINK:CONNECTION
- [2019539](/recalls/tc/2019539.md), 2019-10-25: Steering
- [19V769000](/recalls/nhtsa/19V769000.md), 2019-10-25: STEERING

## Other bulletins for the same vehicles and component

- [PB33\-005\-WST](/bulletins/11020274.md), 2025-07-08, Service bulletin: STEERING. Parts Bulletin for Tie Rod Assembly Part Breakdown
- [PB33\-004\-FTL](/bulletins/11020273.md), 2025-07-08, Service bulletin: STEERING. Parts Bulletin for Tie Rod Assembly Part Breakdown
- [CXA 3\_25\_SAS01T to SAS03T](/bulletins/11016310.md), 2025-04-02, Other: STEERING. CX Advocate for SAS01T to SAS03T replacement \(TSB54\-373\-FTL, TSB54\-097\-WST\)
- [TSB54\-373\-FTL](/bulletins/11014785.md), 2025-03-04, Service bulletin: STEERING. Technical Service Bulletin for SAS01T to SAS03T Replacement Information
- [SS778\-WST](/bulletins/11013219.md), 2025-01-29, Other: STEERING. Service Solution for Power Steering Reservoir Fill Cap Venting
- [ICI23\-010](/bulletins/10233951.md), 2023-04-07, Service bulletin: STEERING. Important Campaign Information letter communicating that SF660 Field Service Campaign is Replaced by FL967.
- [SF660A](/bulletins/10230910.md), 2023-02-04, Service bulletin: STEERING. Revised Field Service Campaign for Drag Link Tapered Joint
- [SF660](/bulletins/10228679.md), 2023-01-06, Service bulletin: STEERING. Field Service Campaign for Drag Link Tapered Joint
- [CALShackle](/bulletins/10185927.md), 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](/bulletins/10184029.md), 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.

JSON: [/v1/bulletins/10186610](/v1/bulletins/10186610)

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