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.