WenmarOpen by Wenmar Pro

Service bulletin FSB-263-039-01

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 id10055176
Published by NHTSA2014-04-18
Manufacturer's numberFSB-263-039-01
Manufacturer's date2014-02-01
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

NHTSA's summary

MACK TRUCKS: THE HDMS COOL LOGIC ENGINE COOLING FAN DRIVE IS LEAKING FLUID FROM REAR DRIVE AND HDMS FAN DRIVE WAS REDESIGNED, DUE TO LEAKAGE, TO IMPROVE SEALING AND OVERALL DURABILITY OF DRIVE. MODEL 2013 CHU, CXU, GU, TD. *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

Engine, Cooling fan, Cooling system

Vehicles listed
MACK CHU2013
MACK GRANITE (GU)2013
MACK PINNACLE (CXU)2013

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