The defect
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 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.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Oshkosh F | 1985, 1986, 1987, 1988, 1989, 1990, 1991 |
| Oshkosh P | 1985, 1986, 1987, 1988, 1989, 1990, 1991 |
Components: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Oshkosh F | 1985 | 0 | 1 |
| Oshkosh F | 1986 | 0 | 1 |
| Oshkosh F | 1987 | 0 | 1 |
| Oshkosh F | 1988 | 0 | 1 |
| Oshkosh F | 1989 | 0 | 1 |
| Oshkosh F | 1990 | 0 | 1 |
| Oshkosh F | 1991 | 0 | 1 |
| Oshkosh P | 1985 | 0 | 1 |
| Oshkosh P | 1986 | 0 | 1 |
| Oshkosh P | 1987 | 0 | 1 |
| Oshkosh P | 1988 | 0 | 1 |
| Oshkosh P | 1989 | 0 | 1 |
| Oshkosh P | 1990 | 0 | 1 |
| Oshkosh P | 1991 | 0 | 1 |
Other service brakes, hydraulic recalls in 1991
32 of the 220 recall campaigns reported to NHTSA in 1991 concerned the service brakes, hydraulic; OSHKOSH TRUCK CORPORATION filed 62 campaigns in all.
| 91V220000 24 Dec 1991 | OSHKOSH TRUCK CORPORATION |
| 91V207000 25 Nov 1991 | PAS, INC. |
| 91V200000 12 Nov 1991 | CHRYSLER CORPORATION |
| 91V191000 1 Nov 1991 | CHRYSLER CORPORATION |
| 91V170000 4 Oct 1991 | CHRYSLER CORPORATION |
| 91V003000 2 Oct 1991 | CHRYSLER CORPORATION |
| 91V158000 13 Sept 1991 | GENERAL MOTORS CORP. |
| 91V161000 11 Sept 1991 | MAZDA (NORTH AMERICA),INC |
NHTSA recalls (public domain) · all recalls of 1991