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Oshkosh F Recall 91V187: Service Brakes, Hydraulic:Foundation Components:Drum

NHTSA campaign 91V187, reported October 27, 1991, 130 vehicles potentially affected.

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The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 91V187OSHKOSH TRUCK CORPORATION
Component
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM
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.
Risk
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.
Notes
SYSTEM: BRAKES AND FRONT SUSPENSION.VEHICLE DESCRIPTION: HEAVY TRUCKS WITH 18000 LBS. DRIVING FRONT AXLES.

Affected vehicles

Oshkosh F1985198619871988198919901991
Oshkosh P1985198619871988198919901991