# Service bulletin DOC\-1033256

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: 10140756
- Published by NHTSA: 2018\-06\-11
- Manufacturer's number: DOC\-1033256
- Manufacturer's date: 2017\-11\-02
- NHTSA component: STRUCTURE; SUSPENSION

## NHTSA's summary

SS: 1033256 \- WST Frame Beaming \- Rough Ride Vibration in bob tail mode

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10140756-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10140756-0001.pdf)

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

## Components

Body and frame, Suspension

## Vehicles listed

- 2018 WESTERN STAR 4900

## Recalls for the same vehicles and component

- [2019552](/recalls/tc/2019552.md), 2019-11-04: Structure
- [2019508](/recalls/tc/2019508.md), 2019-10-10: Structure
- [19V722000](/recalls/nhtsa/19V722000.md), 2019-10-10: STRUCTURE:BODY:DOOR
- [18V913000](/recalls/nhtsa/18V913000.md), 2018-12-19: SUSPENSION:FRONT:CONTROL ARM; STEERING:LINKAGES:TIE ROD ASSEMBLY; STEERING
- [2017407](/recalls/tc/2017407.md), 2017-08-24: Suspension
- [17V521000](/recalls/nhtsa/17V521000.md), 2017-08-24: SUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY

## Other bulletins for the same vehicles and component

- [SS734\-WST](/bulletins/11000986.md), 2024-06-05, Other: SUSPENSION. Service Solution for Thread Spring Pin Suspension Alignment \& Installation
- [SBW31\-016](/bulletins/10177605.md), 2020-07-31, Service bulletin: SUSPENSION:REAR; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. 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 suspension bogie crossmember gussets to the C\-channel will be assembled with 5/8–18 fasteners. This change includes a revision to a higher friction nut that requires an increase in tightening torque. The new higher friction nut can be identified by its green color.
- [SBW72\-008REV](/bulletins/10175409.md), 2020-05-23, Service bulletin: STRUCTURE; 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 older style regulator or window the vehicle must be retrofitted to the new style regulator and window.
- [WP20\-002](/bulletins/10172547.md), 2020-03-17, Service bulletin: STRUCTURE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Warranty Policy Letter explaining the Warranty Department is aligning with the frame rail repair policy, published in DTNA Workshop Manuals, which states that there are very few cases in which welding a heat\-treated frame rail is allowed. Therefore, before welding anything on a frame rail, contact the applicable regional service representative for approval.
- [SS1034621](/bulletins/10170323.md), 2020-01-21, Service bulletin: SUSPENSION. Service Solution for Western Star vehicles equipped with Hendrickson AIRTEK Axles experiencing a Harsh Ride.
- [SBW72\-008](/bulletins/10169534.md), 2019-12-20, Service bulletin: STRUCTURE; VISIBILITY. Service Bulletin for Window Regulator Retrofit.
- [SS1034577](/bulletins/10168678.md), 2019-12-03, Service bulletin: EQUIPMENT; POWER TRAIN; STRUCTURE; EQUIPMENT ADAPTIVE/MOBILITY. Service Solution to address WST Cab drone / vibration / tapping Under acceleration for vehicles w/Eaton Manual Trans.
- [SBW41\-002](/bulletins/10168094.md), 2019-11-21, Service bulletin: SUSPENSION; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. Service Bulletin for midship bearing replacement. This procedure applies to all vehicles built with driveshafts SPL140, SPL170 or SPL250 with first order driveline vibration.
- [19TL\-10 NVH](/bulletins/10164617.md), 2019-09-09, Service bulletin: STRUCTURE. Communication to assist the field with service vibration issues on DTNA vehicles
- [19TL\-9](/bulletins/10163620.md), 2019-08-08, Service bulletin: WHEELS; SUSPENSION; EQUIPMENT. DTNA Special Tools Group has approved the use of Haweka Axis4000 aftermarket alignment system for use on DTNA products at DTNA service locations. The Axis4000 system uses the reference points required by DTNA for precise, accurate, and repeatable measurements. Axis4000 is a sophisticated, user\-friendly system that utilizes computer based camera\-radio technology and references the center line of the frame for measuring and providing alignment results to DTNA specifications.

JSON: [/v1/bulletins/10140756](/v1/bulletins/10140756)

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