# Service bulletin SF634

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: 10209297
- Published by NHTSA: 2022\-04\-01
- Manufacturer's number: SF634
- Manufacturer's date: 2022\-03\-11
- NHTSA component: STRUCTURE

## NHTSA's summary

Field Service Campaign for Western Star 49X Front Crossmember. A loss of clamp load, in the aft connection of the engine crossmember and frame rail, could result in a frame rail crack.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10209297-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10209297-9999.pdf)

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

## Components

Body and frame

## Vehicles listed

- 2021 to 2022 WESTERN STAR 49X

JSON: [/v1/bulletins/10209297](/v1/bulletins/10209297)

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