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Service bulletin K21250579

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 id10165485
Published by NHTSA2019-09-30
Manufacturer's numberK21250579
Manufacturer's date2019-08-27
NHTSA componentPOWER TRAIN; EQUIPMENT

NHTSA's summary

Mack Chassis - Equipped With An Automated Manual Transmission Model D or F ( mDrive, AMT-D, AMT-F ) - Transmission Oil Leakage From Transmission Input Shaft Seal Or Output Shaft Seal - US10 And Newer Emissions, Common Model Years 2010 And Newer

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

Equipment and accessories, Transmission and driveline

Vehicles listed
MACK CHU
MACK CXU
MACK GU
MACK TD

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