Foundation components: drumRecall 91V-187 · Oshkosh vehicles
OSHKOSH TRUCK CORPORATION recall 91V-187 covers 130 Oshkosh vehicles for a foundation components: drum problem, reported to NHTSA on October 27, 1991.
Source: NHTSA recall 91V187000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
THESE VEHICLES HAVE FRONT AXLES WITH BRAKE CAM OPERATION OPPOSITE TO THE ROTATION OF THE BRAKE DRUM (CAM OPPOSITE), AND THERE IS A TENDENCY FOR BRAKES TO CHATTER UNDER LOW AIR PRESSURE, RESULTING IN VIBRATIONS. THE VIBRATIONS INDUCE STRESSES IN THE TIE ROD END BEYOND ITS ENDURANCE LIMIT, AND RESULT IN CRACKS IN THE THREADED PORTION OF THE STUD WHERE THE TUBE ENDS.
The risk
CRACKS IN THE TIE ROD CAN RESULT IN SEPARATION OF THETIE ROD AND LOSS OF VEHICLE CONTROL WITHOUT PRIOR WARNING.
The fix
REPLACE THE CAM OPPOSITE BRAKE ACTUATION WITH CAM SAME BRAKE OPERATION, BY INTERCHANGING THE LEFT AND RIGHT CAM ASSEMBLIES TO AVOID BRAKE CHATTERING; AND REPLACE TIE RODS.
SYSTEM: BRAKES AND FRONT SUSPENSION.VEHICLE DESCRIPTION: HEAVY TRUCKS WITH 18000 LBS. DRIVING FRONT AXLES.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.