MACK RM 1992: TRAILER HITCHES

General Information

NHTSA Campaign ID Number: 93V024000

Make Model Year
MACK RM 1992
Date Owners Notified Date Received by ODI Date Added to Database
1993-03-24 1993-02-16 1993-03-25

Production Dates: 1987-07-01 - 1992-07-01

Manufacturers Involved: Mack Trucks, Inc.

Component: TRAILER HITCHES

Potential Number Of Units Affected: 4924

Report Initiator: MFR MFR Report

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.