MACK R 1979: SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY

General Information

NHTSA Campaign ID Number: 79V171000

Make Model Year
MACK R 1979
Date Owners Notified Date Received by ODI Date Added to Database
1979-12-10 1979-07-12 1979-10-12

Production Dates: 1977-02-01 - 1979-03-01

Manufacturers Involved: Mack Trucks, Inc.

Component: SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY

Potential Number Of Units Affected: 1706

Report Initiator: MFR MFR Report

Summary

THE SPRING SEAT PLATE, LOCATED BETWEEN THE AXLE HOUSING AND THE SUSPENSION SPRINGS, MAY DEFORM DUE TO SPRING BENDING. AS A RESULT, THE CLAMPING FORCE IN THE ASSEMBLY MAY BE REDUCED. LOSS OF CLAMPING FORCE COULD CAUSE SPRING FAILURE AND THE AXLE WILL DISLOCATE. ALSO, THE TIRE COULD COME INTO CONTACT WITH THE SPRING.

Remedy

THE DEALER WILL REPLACE THE EXISTING SPRING SEAT WITH A NEWLY FABRICATED SEAT WHICH IS WELDED TO THE HOUSING. AN IMPROVED SPRING CLAMPING PLATE AND NEW SPRINGS WILL ALSO BE INSTALLED WITHOUT CHARGE.

Notes

VEHICLE DESCRIPTION: TRUCKS.SYSTEM: SUSPENSION; REAR AXLE ASSEMBLY.CONSEQUENCES OF DEFECT: LOSS OF VEHICLE CONTROL AND AN ACCIDENT COULD RESULTDUE TO DISLOCATION OF AXLE AND TIRE TO SPRING INTERFERENCE.