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by Mack Trucks, Inc.

MACK MH RECALLS - (49 Recalls Found)

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1993 MACK MH Recall - TRAILER HITCHES

Problem: THE CARRIER YOKE BOLTS WERE MANUFACTURED WITH WORN ROLLING THREAD DIES, CAUSING STRESS CONCENTRATIONS WHICH CAUSED CRACKS DURING THE QUENCHING PROCESS.Recall Details

1992 MACK MH Recall - VEHICLE SPEED CONTROL

Problem: FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.Recall Details

1992 MACK MH Recall - TRAILER HITCHES

Problem: THE CARRIER YOKE BOLTS WERE MANUFACTURED WITH WORN ROLLING THREAD DIES, CAUSING STRESS CONCENTRATIONS WHICH CAUSED CRACKS DURING THE QUENCHING PROCESS.Recall Details

1991 MACK MH Recall - VEHICLE SPEED CONTROL

Problem: FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.Recall Details

1990 MACK MH Recall - VEHICLE SPEED CONTROL

Problem: FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.Recall Details

1989 MACK MH Recall - VEHICLE SPEED CONTROL

Problem: FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.Recall Details

1989 MACK MH Recall - SUSPENSION:FRONT

Problem: TORQUE ROD BOLTS ARE GRADE 2 INSTEAD OF GRADE 5, WHICH IS NOT TO SPECIFICATION, AND COULD FAIL.Recall Details

1988 MACK MH Recall - SEAT BELTS:REAR/OTHER

Problem: SEAT TETHER BELT 11.0 INCHES LONG WAS INSTALLED INSTEAD OF THE 8.5 INCHES LONG BELT REQUIRED FOR THIS CHASSIS.Recall Details

1988 MACK MH Recall - SUSPENSION:REAR:SPRINGS

Problem: DOWELS MAY HAVE BEEN OMITTED DURING SPRING CAP INSTALLATION; THIS WOULD PUT SHEAR LOAD ON THE FOUR (4) SPRING CAP BOLTS.Recall Details

1988 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details

1988 MACK MH Recall - VEHICLE SPEED CONTROL

Problem: FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.Recall Details

1987 MACK MH Recall - VEHICLE SPEED CONTROL

Problem: FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.Recall Details

1987 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details

1987 MACK MH Recall - SEAT BELTS:REAR/OTHER

Problem: SEAT TETHER BELT 11.0 INCHES LONG WAS INSTALLED INSTEAD OF THE 8.5 INCHES LONG BELT REQUIRED FOR THIS CHASSIS.Recall Details

1987 MACK MH Recall - STEERING:LINKAGES

Problem: ON RIGHT HAND STEERING ARM, KEYWAY MAY BE IN THE WRONG LOCATION CAUSING A TOGGLE CONDITION TO OCCUR UNDER CERTAIN CONDITIONS.Recall Details

1987 MACK MH Recall - STEERING:LINKAGES

Problem: CROSS STEERING LEVERS MAY BE IMPROPERLY HEAT TREATED AND SUBJECT TO FAIL DURING NORMAL OPERATION.Recall Details

1987 MACK MH Recall - STEERING:LINKAGES

Problem: THE PITMAN ARM TO DRAG LINK ANGLE IS OUT OF PHASE.Recall Details

1986 MACK MH Recall - STEERING:LINKAGES

Problem: ON RIGHT HAND STEERING ARM, KEYWAY MAY BE IN THE WRONG LOCATION CAUSING A TOGGLE CONDITION TO OCCUR UNDER CERTAIN CONDITIONS.Recall Details

1986 MACK MH Recall - STRUCTURE

Problem: LEFT OR RIGHT CAB STEP MAY CRACK IN ITS WELDED AREA DUE TO FLEXING OF THE STEP DURING ENTERING AND EXITING. CONSEQUENCE OF DEFECT: AS THE CRACKS EXTEND, THE TUBULAR STEP COULD PARTIALLY COLLAPSE AND BREAK WITHOUT WARNING TO THE USER, AND COULD RESULT IN PERSONAL INJURIES.Recall Details

1986 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details

1985 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details

1985 MACK MH Recall - STRUCTURE

Problem: LEFT OR RIGHT CAB STEP MAY CRACK IN ITS WELDED AREA DUE TO FLEXING OF THE STEP DURING ENTERING AND EXITING. CONSEQUENCE OF DEFECT: AS THE CRACKS EXTEND, THE TUBULAR STEP COULD PARTIALLY COLLAPSE AND BREAK WITHOUT WARNING TO THE USER, AND COULD RESULT IN PERSONAL INJURIES.Recall Details

1985 MACK MH Recall - STEERING:LINKAGES:DRAG:LINK:CONNECTION

Problem: THE DRAG LINKS MAY HAVE BEEN INSTALLED INCORRECTLY ALLOWING DRAG LINK CLAMP BOLT TO AXLE BEAM INTERFERENCE. CONSEQUENCE OF DEFECT: DURING A TURNING MANEUVER, INCREASED STEERING EFFORT OR COMPLETE LOCKUP OF STEERING COULD OCCUR WITHOUT WARNING. THIS COULD RESULT IN LOSS OF TRUCK CONTROL AND A CRASH.Recall Details

1985 MACK MH Recall - SERVICE BRAKES, AIR

Problem: THE DUAL DOUBLE CHECK VALVE MAY NOT RELEASE THE PROPER AIR VOLUME TO THE BRAKE SYSTEM, CAUSING A SLIGHT TIMING DELAY BETWEEN THE TRACTOR AND THE TRAILER BRAKE SYSTEM. CONSEQUENCES OF DEFECT: IF THE BRAKES ARE SUDDENLY APPLIED, THE TRAILER COULD JACKKNIFE WITHOUT WARNING TO THE OPERATOR, WHICH COULD RESULT IN A VEHICLE CRASH.Recall Details

1985 MACK MH Recall - STRUCTURE:BODY:BUMPERS

Problem: THE FLIP OUT STEP CLEVIS ON THE BUMPER MAY FAIL AND BREAK UNDER THE WEIGHT OF THE PERSON STANDING ON THE STEP TO SERVICE THE FRONT AREA OF THE VEHICLE. CONSEQUENCE OF DEFECT: THIS SUDDEN BREAK WILL CAUSE THE PERSON STANDING ON THE STEP TO FALL, WITHOUT WARNING, AND COULD RESULT IN INJURIES.Recall Details

1984 MACK MH Recall - STEERING:LINKAGES:DRAG:LINK:CONNECTION

Problem: THE DRAG LINKS MAY HAVE BEEN INSTALLED INCORRECTLY ALLOWING DRAG LINK CLAMP BOLT TO AXLE BEAM INTERFERENCE. CONSEQUENCE OF DEFECT: DURING A TURNING MANEUVER, INCREASED STEERING EFFORT OR COMPLETE LOCKUP OF STEERING COULD OCCUR WITHOUT WARNING. THIS COULD RESULT IN LOSS OF TRUCK CONTROL AND A CRASH.Recall Details

1984 MACK MH Recall - STRUCTURE:BODY:BUMPERS

Problem: THE FLIP OUT STEP CLEVIS ON THE BUMPER MAY FAIL AND BREAK UNDER THE WEIGHT OF THE PERSON STANDING ON THE STEP TO SERVICE THE FRONT AREA OF THE VEHICLE. CONSEQUENCE OF DEFECT: THIS SUDDEN BREAK WILL CAUSE THE PERSON STANDING ON THE STEP TO FALL, WITHOUT WARNING, AND COULD RESULT IN INJURIES.Recall Details

1984 MACK MH Recall - TRAILER HITCHES:FIFTH WHEEL ASSEMBLY

Problem: DUE TO IMPROPER AND INADEQUATE WELDING PRACTICES, THE FIFTH WHEEL ON THE INVOLVED VEHICLES IS DEFECTIVE. FRAME MOUNTED SUPPORTS MAY HAVE INCOMPLETE OR POOR QUALITY WELDS. THE WELDS COULD SUBSEQUENTLY FAIL ALLOWING SEPARATION OF THE TRACTOR FROM THE TRAILER.Recall Details

1984 MACK MH Recall - LATCHES/LOCKS/LINKAGES:DOORS:LATCH

Problem: THE DOOR LATCHES MAY BE DEFECTIVE BECAUSE A PAWL SPRING WAS NOT MANUFACTURED TO SPECIFICATIONS. THE PAWL SPRING DOES NOT CREATE PROPER TENSION ON THE PAWL, (A PART OF THE DOOR LATCH MECHANISM). THIS CONSTITUTES A NON-COMPLIANCE WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 206, "DOOR LATCHES AND DOOR RETENTION COMPONENTS".Recall Details

1984 MACK MH Recall - SUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY

Problem: THE SPRING CENTER BOLT IS NOT THE PROPER SIZE OR LENGTH. AS A RESULT, LOCATION AND ALIGNMENT OF THE SPRING TO THE FRONT AXLE MAY NOT BE CORRECT. IF THE FRONT SPRING CLIPS LOOSEN, THE INADEQUATE CENTER BOLT MAY RESULT IN SPRING TO AXLE MISALIGNMENT, SHIFTING OF THE AXLE, AND LOSS OF STEERING CONTROL.Recall Details

1984 MACK MH Recall - STEERING: STEERING WHEEL/HANDLE BAR

Problem: IMPROPER STEERING CLAMP BOLTS AND TORQUE APPLIED DURING INSTALLATION. THE BOLT COULD FAIL, ALLOWING THE STEERING YOKE TO BECOME LOOSE.Recall Details

1984 MACK MH Recall - STRUCTURE

Problem: LEFT OR RIGHT CAB STEP MAY CRACK IN ITS WELDED AREA DUE TO FLEXING OF THE STEP DURING ENTERING AND EXITING. CONSEQUENCE OF DEFECT: AS THE CRACKS EXTEND, THE TUBULAR STEP COULD PARTIALLY COLLAPSE AND BREAK WITHOUT WARNING TO THE USER, AND COULD RESULT IN PERSONAL INJURIES.Recall Details

1984 MACK MH Recall - SERVICE BRAKES, AIR

Problem: THE DUAL DOUBLE CHECK VALVE MAY NOT RELEASE THE PROPER AIR VOLUME TO THE BRAKE SYSTEM, CAUSING A SLIGHT TIMING DELAY BETWEEN THE TRACTOR AND THE TRAILER BRAKE SYSTEM. CONSEQUENCES OF DEFECT: IF THE BRAKES ARE SUDDENLY APPLIED, THE TRAILER COULD JACKKNIFE WITHOUT WARNING TO THE OPERATOR, WHICH COULD RESULT IN A VEHICLE CRASH.Recall Details

1984 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details

1983 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details

1983 MACK MH Recall - SERVICE BRAKES, AIR

Problem: THE DUAL DOUBLE CHECK VALVE MAY NOT RELEASE THE PROPER AIR VOLUME TO THE BRAKE SYSTEM, CAUSING A SLIGHT TIMING DELAY BETWEEN THE TRACTOR AND THE TRAILER BRAKE SYSTEM. CONSEQUENCES OF DEFECT: IF THE BRAKES ARE SUDDENLY APPLIED, THE TRAILER COULD JACKKNIFE WITHOUT WARNING TO THE OPERATOR, WHICH COULD RESULT IN A VEHICLE CRASH.Recall Details

1983 MACK MH Recall - STRUCTURE

Problem: LEFT OR RIGHT CAB STEP MAY CRACK IN ITS WELDED AREA DUE TO FLEXING OF THE STEP DURING ENTERING AND EXITING. CONSEQUENCE OF DEFECT: AS THE CRACKS EXTEND, THE TUBULAR STEP COULD PARTIALLY COLLAPSE AND BREAK WITHOUT WARNING TO THE USER, AND COULD RESULT IN PERSONAL INJURIES.Recall Details

1983 MACK MH Recall - STEERING: STEERING WHEEL/HANDLE BAR

Problem: UNDER SEVERE STRAIN, A DEFECTIVE WELD JOINING THE STEERING WHEEL HUB TO THE HUB PERIMETER COULD FAIL, CAUSING THE STEERING WHEEL TO SEPARATE FROM THE VEHICLE.Recall Details

1983 MACK MH Recall - STEERING: STEERING WHEEL/HANDLE BAR

Problem: IMPROPER STEERING CLAMP BOLTS AND TORQUE APPLIED DURING INSTALLATION. THE BOLT COULD FAIL, ALLOWING THE STEERING YOKE TO BECOME LOOSE.Recall Details

1983 MACK MH Recall - SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

Problem: A MANUFACTURING ERROR RESULTED IN THE INSTALLATION OF CARBON STEEL SPRINGS IN SOME DUAL-COMPARTMENT AIR RESERVOIR CHECK VALVES. CARBON STEEL SPRINGS ARE INADEQUATE FOR THIS APPLICATION BECAUSE THEY ARE SUBJECT TO SEVERE CORROSION AND SUBSEQUENT FAILURE OF THE CHECK VALVE.Recall Details

1983 MACK MH Recall - TRAILER HITCHES:FIFTH WHEEL ASSEMBLY

Problem: DUE TO IMPROPER AND INADEQUATE WELDING PRACTICES, THE FIFTH WHEEL ON THE INVOLVED VEHICLES IS DEFECTIVE. FRAME MOUNTED SUPPORTS MAY HAVE INCOMPLETE OR POOR QUALITY WELDS. THE WELDS COULD SUBSEQUENTLY FAIL ALLOWING SEPARATION OF THE TRACTOR FROM THE TRAILER.Recall Details

1983 MACK MH Recall - STRUCTURE:BODY:BUMPERS

Problem: THE FLIP OUT STEP CLEVIS ON THE BUMPER MAY FAIL AND BREAK UNDER THE WEIGHT OF THE PERSON STANDING ON THE STEP TO SERVICE THE FRONT AREA OF THE VEHICLE. CONSEQUENCE OF DEFECT: THIS SUDDEN BREAK WILL CAUSE THE PERSON STANDING ON THE STEP TO FALL, WITHOUT WARNING, AND COULD RESULT IN INJURIES.Recall Details

1982 MACK MH Recall - STRUCTURE:BODY:BUMPERS

Problem: THE FLIP OUT STEP CLEVIS ON THE BUMPER MAY FAIL AND BREAK UNDER THE WEIGHT OF THE PERSON STANDING ON THE STEP TO SERVICE THE FRONT AREA OF THE VEHICLE. CONSEQUENCE OF DEFECT: THIS SUDDEN BREAK WILL CAUSE THE PERSON STANDING ON THE STEP TO FALL, WITHOUT WARNING, AND COULD RESULT IN INJURIES.Recall Details

1982 MACK MH Recall - STEERING: STEERING WHEEL/HANDLE BAR

Problem: UNDER SEVERE STRAIN, A DEFECTIVE WELD JOINING THE STEERING WHEEL HUB TO THE HUB PERIMETER COULD FAIL, CAUSING THE STEERING WHEEL TO SEPARATE FROM THE VEHICLE.Recall Details

1982 MACK MH Recall - TRAILER HITCHES:FIFTH WHEEL ASSEMBLY

Problem: DUE TO IMPROPER AND INADEQUATE WELDING PRACTICES, THE FIFTH WHEEL ON THE INVOLVED VEHICLES IS DEFECTIVE. FRAME MOUNTED SUPPORTS MAY HAVE INCOMPLETE OR POOR QUALITY WELDS. THE WELDS COULD SUBSEQUENTLY FAIL ALLOWING SEPARATION OF THE TRACTOR FROM THE TRAILER.Recall Details

1982 MACK MH Recall - SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

Problem: A MANUFACTURING ERROR RESULTED IN THE INSTALLATION OF CARBON STEEL SPRINGS IN SOME DUAL-COMPARTMENT AIR RESERVOIR CHECK VALVES. CARBON STEEL SPRINGS ARE INADEQUATE FOR THIS APPLICATION BECAUSE THEY ARE SUBJECT TO SEVERE CORROSION AND SUBSEQUENT FAILURE OF THE CHECK VALVE.Recall Details

1982 MACK MH Recall - STRUCTURE

Problem: LEFT OR RIGHT CAB STEP MAY CRACK IN ITS WELDED AREA DUE TO FLEXING OF THE STEP DURING ENTERING AND EXITING. CONSEQUENCE OF DEFECT: AS THE CRACKS EXTEND, THE TUBULAR STEP COULD PARTIALLY COLLAPSE AND BREAK WITHOUT WARNING TO THE USER, AND COULD RESULT IN PERSONAL INJURIES.Recall Details

1982 MACK MH Recall - SERVICE BRAKES, AIR

Problem: THE DUAL DOUBLE CHECK VALVE MAY NOT RELEASE THE PROPER AIR VOLUME TO THE BRAKE SYSTEM, CAUSING A SLIGHT TIMING DELAY BETWEEN THE TRACTOR AND THE TRAILER BRAKE SYSTEM. CONSEQUENCES OF DEFECT: IF THE BRAKES ARE SUDDENLY APPLIED, THE TRAILER COULD JACKKNIFE WITHOUT WARNING TO THE OPERATOR, WHICH COULD RESULT IN A VEHICLE CRASH.Recall Details

1982 MACK MH Recall - SEAT BELTS

Problem: SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.Recall Details
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