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Service bulletin TB-22-12

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 id10030394
Published by NHTSA2009-09-29
Manufacturer's numberTB-22-12
Manufacturer's date2009-09-28
NHTSA componentSUSPENSION:MULTIPLE AXLE

NHTSA's summary

KENWORTH TRUCK SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. A NEW STANDARD AXLE LUBE WOULD BE STANDARD INCHASSIS BEGINNING 9/15/08. THE CHASSIS LISTED WERE MANUFACTURED AFTER THAT DATE BUT WITH THE PREVIOUS STANDARD LUBE. MODELS C500, T600, T800 AND W900. CSC LETTER REC'D. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Suspension

Vehicles listed
KENWORTH C5002008
KENWORTH T6002008
KENWORTH T6602008
KENWORTH T8002008
KENWORTH W9002008

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