Springs: leaf spring assemblyRecall 79V-171 · Mack vehicles
MACK TRUCKS, INCORPORATED recall 79V-171 covers 1,706 Mack vehicles for a springs: leaf spring assembly problem, reported to NHTSA on July 12, 1979.
Source: NHTSA recall 79V171000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
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.
The fix
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.
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.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.