Campaign 93V-024

Carrier yoke bolts were manufactured with worn rolling thread dies, causing stress concentrations which caused cracks during the quenching process

Defect summary

THE CARRIER YOKE BOLTS WERE MANUFACTURED WITH WORN ROLLING THREAD DIES, CAUSING STRESS CONCENTRATIONS WHICH CAUSED CRACKS DURING THE QUENCHING PROCESS.

Consequence

THIS CONDITION CAN CAUSE BOLT FAILURE AND ALLOW THEDRIVELINE TO SEPARATE FROM THE CARRIER ASSEMBLY.

Remedy

REPLACE THE CARRIER YOKE BOLTS.

Notes

SYSTEM: TRAILER YOKE.VEHICLE DESCRIPTION: HEAVY TRUCKS.

Source: NHTSA ODI recalls file, campaign 93V024000. Text as published by NHTSA.

Vehicles covered

8 product lines are covered

Owner complaints filed with NHTSA about trailer hitches on these vehicles: 0, of which 0 involved a crash, fire, injury or death. Complaints are not verified by NHTSA.

Vehicles covered by campaign 93V-024
Make	Model	Model years
Mack	CH	1992 to 1993
Mack	CL	1992 to 1993
Mack	DM	1992 to 1993
Mack	MH	1992 to 1993
Mack	MR	1992 to 1993
Mack	RB	1992 to 1993
Mack	RD	1992 to 1993
Mack	RM	1992 to 1993

Source: NHTSA ODI recalls and complaints files. Equipment, tire and child-seat campaigns list products, not vehicles.

Investigation

No NHTSA investigation is linked to this recall

Most recalls are started by the manufacturer. This one lists "Manufacturer" as its origin.

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Fifth wheel may have an outboard slider bracket that is too narrow, possibly allowing the trailer to separate from the tractor
15V-644 Oct 13, 2015
Affected trucks are equipped with Fontaine Ultra LT Fifth Wheel connectors, which, due to cumulative damage to the fifth wheel and its locking…
15V-139 Mar 11, 2015
Affected vehicles have a switch to release the fifth wheel latch that may invertently be pushed and cause the trailer to unintentionally…
11V-461 Sep 1, 2011
During the coupling process, it is possible for the driver to partially close the fifth wheel lock and if solely relying on a tug test (pull…
11V-209 Mar 31, 2011
There may be an interference with the bolts used to secure the fifth wheel to the frame that can prevent the bolts from being torqued to specification
07V-497 Oct 23, 2007
On certain trucks equipped with a saf holland simplex fifth wheel, the lever arm pivot bolt may have been over tightened