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Service bulletin SP-301 Rev-B

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10151439
Published by NHTSA2018-12-10
Manufacturer's numberSP-301 Rev-B
Manufacturer's date2018-10-01
NHTSA componentSUSPENSION

NHTSA's summary

Operation Name: Hendrickson Truck Commercial Vehicle Systems Document Name: Parts List - ULTIMAAX Rear Suspension for Kenworth Vehicles Summary: This document provides parts lists for Hendrickson ULTIMAAX rear suspension systems equipped on applcable Kenworth vehicles.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Suspension

Vehicles listed
HENDRICKSON HENDRICKSON

Listing a model year does not mean every vehicle of it is concerned: the document says which.