NHTSA Campaign 91V187000

SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM

Issued by OSHKOSH TRUCK CORPORATION · Reported Oct 27, 1991 · 130 vehicles affected

What's wrong

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.

Consequence

CRACKS IN THE TIE ROD CAN RESULT IN SEPARATION OF THETIE ROD AND LOSS OF VEHICLE CONTROL WITHOUT PRIOR WARNING.

Remedy

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.

Vehicles affected by this recall

Make Model Year Units
OSHKOSH F 1985 130
OSHKOSH F 1986 130
OSHKOSH F 1987 130
OSHKOSH F 1988 130
OSHKOSH F 1989 130
OSHKOSH F 1990 130
OSHKOSH F 1991 130
OSHKOSH P 1985 130
OSHKOSH P 1986 130
OSHKOSH P 1987 130
OSHKOSH P 1988 130
OSHKOSH P 1989 130
OSHKOSH P 1990 130
OSHKOSH P 1991 130

Source: NHTSA Campaign 91V187000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.