VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH 15 (WIDTHS: 4 AND 5) AIR-ACTUATED Q-PLUS CAM BRAKE EQUIPPED WITH FEDERAL MOGUL FRICTION PRODUCTS 3030-197 BRAKE LINING (MERITOR R201) BRAKE LININGS AND ACTUATED WITH TYPE 20 AIR CHAMBERS X 5.5 SLACK ADJUSTERS. THE AFFECTED BRAKES WERE INSTALLED PREDOMINANTLY IN HEAVY TRUCK FRONT AXLE ASSEMBLIES. THESE ASSEMBLIES DO NOT FULLY SATISFY THE TEST PERFORMANCE REQUIREMENTS OF FMVSS NO. 121, AIR BRAKE SYSTEMS.
VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH MERITOR AIR BRAKE AUTOMATIC SLACK ADJUSTERS. SOME OF THE AUTOMATIC SLACK ADJUSTERS HAD INSUFFICIENT TORQUE APPLIED TO THE GUIDE PAWL CAP SCREW.
DURING ASSEMBLY, THE TIE ROD END NUTS WERE NOT PROPERLY TORQUED. EXTREMELY LOW TORQUE CAN ALLOW MOVEMENT BETWEEN THE BALL STUD AND THE TIE ROD ARM CAUSING DAMAGE.
AIR SYSTEM BLOCKAGE IN THE AIR DRYER OCCURS DEGRADING THE MOISTURE REMOVING CAPABILITIES OF THE DRYER WHEN THE VEHICLE IS OPERATED IN A COLD ENVIRONMENT AND MOISTURE ACCUMULATES AND FREEZES IN THE AIR DRYER OR IN THE LINE BETWEEN THE DRYER AND THE AIR SYSTEM RESERVOIR. THE AIR DRYER CAN BECOME OVER PRESSURIZED CAUSING THE AIR DRYER CARTRIDGE TO SEPARATE FROM THE MOUNTING BASE.
AIR SYSTEM BLOCKAGE IN THE AIR DRYER OCCURS DEGRADING THE MOISTURE REMOVING CAPABILITIES OF THE DRYER WHEN THE VEHICLE IS OPERATED IN A COLD ENVIRONMENT AND MOISTURE ACCUMULATES AND FREEZES IN THE AIR DRYER OR IN THE LINE BETWEEN THE DRYER AND THE AIR SYSTEM RESERVOIR. THE AIR DRYER CAN BECOME OVER PRESSURIZED CAUSING THE AIR DRYER CARTRIDGE TO SEPARATE FROM THE MOUNTING BASE.
AIR SYSTEM BLOCKAGE IN THE AIR DRYER OCCURS DEGRADING THE MOISTURE REMOVING CAPABILITIES OF THE DRYER WHEN THE VEHICLE IS OPERATED IN A COLD ENVIRONMENT AND MOISTURE ACCUMULATES AND FREEZES IN THE AIR DRYER OR IN THE LINE BETWEEN THE DRYER AND THE AIR SYSTEM RESERVOIR. THE AIR DRYER CAN BECOME OVER PRESSURIZED CAUSING THE AIR DRYER CARTRIDGE TO SEPARATE FROM THE MOUNTING BASE.
AN INCORRECT TOOL WAS USED TO INSTALL PITMAN ARM PINCH BOLTS, RESULTING IN INADEQUATE TORQUE ON THE PITMAN ARM PINCH BOLTS.
THE WHEEL MOUNTING STUDS ON IRON FRONT AND REAR HUBS CAN FRACTURE.
A CRACK IN THE DIE CAST ALUMINUM HOUSING OF THE BRAKE CHAMBER CAUSES A LOSS OF AIR PRESSURE IN THE CHAMBER. LOSS OF AIR PRESSURE CAUSES THE SPRING BRAKES TO BE APPLIED.
TRW SUPPLIED POWER STEERING GEARS WITH NON-HEAT-TREATED WORM SCREWS. THE STEERING GEARS WITHOUT HEAT TREATED WORM SCREWS CAN LOCK UP IN TIGHT TURNING MANEUVERS.
TRW SUPPLIED POWER STEERING GEARS WITH NON-HEAT-TREATED WORM SCREWS. THE STEERING GEARS WITHOUT HEAT TREATED WORM SCREWS CAN LOCK UP IN TIGHT TURNING MANEUVERS.
AN INCORRECT PINCH BOLT WAS USED IN THE STEERING GEAR PITMAN ARM THAT DOES NOT ALLOW PROPER CLAMPING FORCE ON THE ARM SPLINE.
AN INCORRECT PINCH BOLT WAS USED IN THE STEERING GEAR PITMAN ARM THAT DOES NOT ALLOW PROPER CLAMPING FORCE ON THE ARM SPLINE.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
FUEL LINE ROUTING COULD ALLOW THE LINE TO CONTACT THE ELECTRICAL CONNECTION ON THE STARTER SOLENOID.
BOLTS MAY BE MISSING FROM THE UPPER MOUNTING BRACKET OF THE 3 POINT SEAT BELT.
AN INCORRECT FRONT AXLE BRAKE VALVE MAY HAVE BEEN INSTALLED.
AN INCORRECT FRONT AXLE BRAKE VALVE MAY HAVE BEEN INSTALLED.
STEERING DRAGLINK NUTS MAY NOT BE PROPERLY TORQUED.
THE MALLEABLE IRON REAR HUBS MAY EXHIBIT CRACKS. ALSO, THE FRONT AXLE HUBS MAY HAVE NOT BEEN PROPERLY HEAT TREATED.
ON CERTAIN VEHICLES, THE AIR STARTER VALVES MAY BECOME INTERNALLY DAMAGED DURING NORMAL OPERATION. THIS MAY RESULT IN A MALFUNCTION OF THE VALVE, CAUSING THE AIR STARTER TO SELF ACTUATE AND START THE ENGINE OF AN UNATTENDED VEHICLE.
ON CERTAIN VEHICLES, THE AIR STARTER VALVES MAY BECOME INTERNALLY DAMAGED DURING NORMAL OPERATION. THIS MAY RESULT IN A MALFUNCTION OF THE VALVE, CAUSING THE AIR STARTER TO SELF ACTUATE AND START THE ENGINE OF AN UNATTENDED VEHICLE.
IT MAY BE POSSIBLE FOR THE LCF THROTTLE ROD BELL CRANK TO MAKE CONTACT WITH THE RADIATOR SEAL. THIS CAN RESULT IN REDUCED ENGINE PERFORMANCE AND/OR THROTTLE RETURN.
IT MAY BE POSSIBLE FOR THE LCF THROTTLE ROD BELL CRANK TO MAKE CONTACT WITH THE RADIATOR SEAL. THIS CAN RESULT IN REDUCED ENGINE PERFORMANCE AND/OR THROTTLE RETURN.
IT MAY BE POSSIBLE FOR THE LCF THROTTLE ROD BELL CRANK TO MAKE CONTACT WITH THE RADIATOR SEAL. THIS CAN RESULT IN REDUCED ENGINE PERFORMANCE AND/OR THROTTLE RETURN.