WenmarOpen by Wenmar Pro

Service bulletin SB-12-1043

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 id10027264
Published by NHTSA2009-01-13
Manufacturer's numberSB-12-1043
Manufacturer's date2008-10-10
NHTSA componentSUSPENSION:REAR; SUSPENSION

NHTSA's summary

MACK TRUCK: SUSPENSION CROSSMEMBERS, PRIMAAX REAR SUSPENSION. MODELS EQUIPPED WITH THE HENDRICKSON PRIMAAX REAR AIR SUSPENSION MAY DEVELOP A CRACK IN THE RADIUS OF THE LOWER END GUSSET. *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
MACK CHN2006, 2007, 2008
MACK CHU2006 to 2008
MACK CXN2006 to 2008
MACK CXP2006 to 2008
MACK CXU2006 to 2008

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

Other bulletins for the same vehicles and component
M728-005A 2023082023-09-06. Service bulletin. TSB: Barksdale Leveling Valve, Leak Test
M-451-0012022-09-01. Service bulletin. 2007 Document reformatted to be published as a TSB in Impact. Updated Crossmember for improved clearance.
M-711-0012022-09-01. Service bulletin. 2008 Document reformatted to be published as a TSB in Impact. Rear Suspension Repair.
KC-21702022-06-07. Service bulletin. Electronically Controlled Suspension (ECS) Losing Air Pressure
PI-07802012-06-13. Service bulletin. MACK: DURING EXTREME DOWNWARD ARTICULATION OF REAR AXLE, THE AIR SPRING MAY SEPARATE AT MOUNTING BELL. *PE
FSB-461-0012011-09-08. Service bulletin. MACK TRUCKS: REAR AXLE HOUSING REPLACEMENT. *RM
1210312006-09-21. Service bulletin. SUSPENSION CROSSMEMBERS - CXN AND CHN MODELS EQUIPPED WITH MACK AL SUSPENSION. *TT