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Service bulletin TSB 421

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 id10110777
Published by NHTSA2017-08-07
Manufacturer's numberTSB 421
Manufacturer's date2015-07-23
NHTSA componentEQUIPMENT:MECHANICAL; POWER TRAIN:AXLE ASSEMBLY

NHTSA's summary

Spartan Motors Chassis, Inc. has released a Recall Spartan NHTSA # 15V-388, TC # 2015 283. Certain 2015- 2016 model units on Spartan K3 Chassis are affected. Fasteners that attach the stay rod to the rear drive axle may not have been installed with thread locker or tightened in the correct sequence. The fasteners may loosen and the stay rod could disconnect from the rear drive axle allowing the rear axle to move freely in certain directions. This could cause loss of vehicle control which may increase the risk of a crash. The loosening of the fasteners may occur without warning.

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, Axle

Vehicles listed
NEWMAR ESSEX2015
NEWMAR KING AIRE2015 to 2016
NEWMAR LONDON AIRE2015
NEWMAR MOUNTAIN AIRE2015

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