Safety defect investigations, technical specifications, and manufacturer repair notices for Canadian owners.
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Safety recall notices and repair campaigns registered for the 1978 Mack Ws in Canada.
THE SPRING SEAT, WHICH IS LOCATED BETWEEN THE AXLE HOUSING AND THE REAR SUSPENSION SPRING PACK CAN DEFORM, RESULTING IN REDUCED CLAMPING FORCE IN THE SUSPENSION ASSEMBLY. THIS COULD CAUSE AXLE MISALIGNMENT, SPRING "U" BOLT LOOSENESS AND HOUSING FAILURE. AXLE DISLOCATION, WHICH COULD RESULT IN TIRE TO SPRING INTERFERENCE AND POSSIBLE IMPAIRMENT OF VEHICLE CONTROL, COULD OCCUR WITHOUT PRIOR WARNING.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
ENGINE SUPPORT BRACKET MAY DEVELOP CRACKS DUE TO A DEFICIENCY IN MATERIAL PROPERTIES. COMPLETE FRACTURE COULD CAUSE THE ENGINE TO DROP DOWN INTO THE RADIATOR, DAMAGING THE SHROUD, ENGINE FAN AND OTHER APPROXIMATE PARTS AND PULL ENGINE THROTTLE INTO FULL GOVERNED POSITION THEREBY IMPAIRING VEHICLE CONTROL.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
VEHICLES EQUIPPED WITH TAPER LEAF FRONT SPRINGS MAY HAVE ALUMINUM FRONT SPRING REAR BRAKCETS WITH INADEQUATE STRENGTH TO WITHSTAND NORMAL SIDE LOADINGS. FAILURE OF THE BRACKET COULD ALLOW SOME UPWARD DISLOCATION OF THE STEERING AXLE TO THE AXLE DUMP STOP.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
TRUCKS EQUIPPED WITH ANCHORLOK AIR SUSPENSION SEATS. VEHICLES EQUIPPED WITH ANCHORLOK AIR SUSPENSION SEATS HAVE TETHER BELT MOUNTING BRACKETS WHICH COULD ALLOW THE SEAT UPPER BASE TO ROTATE AND DISCONNECT AT LOADS LESS THAN THOSE SPECIFIED BY C.M.V.S.S. 210 - SEAT BELT ASSEMBLY ANCHORAGES.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
THE CAB ELECTRICAL FEED CABLES MAY HAVE BEEN INSTALLED WITH INADEQUATE CRIMPING OF THE CABLE AT THE CABLE TERMINAL. THIS CONDITION COULD RESULT IN SEPARATION OF THE CABLE FROM THE TERMINAL AND LOSS OF ELECTRICAL POWER TO THE HEADLIGHTS.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
THE FLANGE HEAD PINCH BOLTS USED IN THE YOKES OF THE STEERING SHAFT ASSEMBLIES MAY HAVE BEEN OVERSTRESSED DUE TO IMPROPER TORQUE SPECIFICATIONS. THIS COULD RESULT IN BREAKAGE OF THE PINCH BOLTS AN POSSIBLE LOSS OF STEERING CONTROL WITHOUT PRIOR WARNING.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
VEHICLES EQUIPPED WITH FF931, FAW536 OR RAW537 STEERING AXLES WITH SHEPPARD STEERING GEARS MAY NOT HAVE THE PITMAN ARM RETAINING SCREWS TORQUED TO SPECIFICATION. THS RETAINING SCREWS COULD LOOSEN AND RESULT IN WEAR ON EITHER THE PITMAN ARM SPLINES AND/OR THE STEERING GEAR OUTPUT SHAFT SPLINES AND ULTIMATELY LEAD TO A LOSS OF STEERING CONTROL. STEERING CONTROL.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
VEHICLES EQUIPPED WITH MACK RA23 OR RA24 REAR AXLES MAY CONTAIN REAR SUSPENSION SPRING SEATS THAT COULD DEFORM ON SPRING DEFLECTION RESURING GEAR OUTPUT SHAFT SPLINES AND ULTIMATELY LEAD TO A LOSS OF VEHICLES EQUIPPED WITH MACK RA23 OR RA24 REAR AXLES MAY CONTAIN REAR SUSPENSION SPRING SEATS THAT COULD DEFORM ON SPRING DEFLECTION RESULTING IN REDUCED CLAMPING FORCE. THIS COULD RESULT IN SPRING SLIP FAILURE ALLOWING THE AXLE TO DISLOCATE CAUSING TIRE/SPRING INTERFERENCE AND POSSIBLE LOSS OF VEHICLE CONTROL.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
TRUCKS EQUIPPED WITH MACK ENDT (B) 676, ETAZ (B) 673A AND ETAY (B) 673A ENGINES WITH AIRESEARCH TV6103 TURBO-CHARGERS. IN SOME INSTNACES OF TURBOCHARGER COMP[RESSOR WHEEL FAILURE THE CAPSCREWS RETAINING THE COMPRESSOR BACK PLATE MAY BE STRUCK BY PART OF THE COMP-RESSOR WHEEL. HTIS CAN RESULT IN THE CAPSCREWS BEING STRETCHED OR SHEARED, ALLOWING THE BACKPLATE TO DISLOCATE AND PRESSURIZED ENGINE OIL TO CONTACT THE HOT TURBOCHARGER TURBINE HOUSINGS AND/OR ENGINE EXHAUST MANIFOLD SECTIONS, THUS CREATING A POTENTIAL FOR ENGINE COMPARTMENT FIRE.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
TRUCKS EQUIPPED WITH MANUAL STEERING. SUBJECT VEHICLES MAY HAVE BEEN BUILT WITH PITMAN ARM RETAINING NUTS THAT WERE NOT TORQUED TO SPECIFICATION. THIS CONDITION COULD RESULT IN INADEQUATE RETENTION OF THE NUT TO THE OUTPUT SHAFT ALLOWING THE PITMAN ARM TO COME LOOSE. IF THIS CONDITION IS NOT CORRECTED, THE SPLINED GROOVES ON THE OUTPUT SHAFT COULD WEAR SMOOTH CAUSING A LOSS OF STEERING CONTROL.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
ANTI-WHEEL LOCK VALVES SUPPLIED BY EATON CORPORATION MAY BE EXPOSED TO ACCUMULATED CONCENTRATIONS OF FLUID CONTAMINANTS IN THE AIR BRAKE SYSTEM THAT COULD CAUSE THE PISTON TO STICK THEREBY PREVENTING ANY AIR FROM BEING DELIVERED TO THE AIR BRAKE CHAMBERS SUPPLIED BY THAT VALVE. LTHIS CONDITION WILL RESULT IN A NO BRAKE APPLICATION ON THE AFFECTED AXLE, THEREBY EXTENDING VEHICLE STOPPING DISTANCES.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
TRUCKS EQUIPPED WITH BOGIE (TANDEM REAR) AXLES THAT ARE EQUIPPED TRUCKS EQUIPPED WITH BOGIE (TANDEM REAR) AXLES THAT ARE EQUIPPED WITH A SINGLE ANTI-WHEEL LOCK CONTROLLER. WHEEL SENSOR WIRE FAILURES MAY CAUSE DELAYS OF UP TO TWO SECONDS IN IMPLEMENTING THE ANTI-WHEEL LOCK SYSTEM ON THE BOGIE AXLES. THIS DELAY RESULTS IN A REDUCTION OF THE VEHICLE'S FULL BRAKING CAPABILITY.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
VEHICLES EQUIPPED WITH CUMMINS NTC - SERIES ENGINES AND FULLER RT OR SPICER SST SERIES TRANSMISSIONS. INVOLVED VEHICLES HAVE ALUMINUM ENGINE REAR SUPPORT BRACKETS WHICH MAY FAIL ALLOWING THE ENGINE AND TRANSMISSION ASSEMBLY TO DISLOCATE DOWNWARD. THIS CONDITION COULD CAUSE A LOSS OF THROTTLE CONTROL AND RESULT IN A VEHICLE CRASH. ENGINE REAR SUPPORT BRACKETS WHICH MAY FAIL ALLOWING THE ENGINE AND TRANSMISSION ASSEMBLY TO DISLOCATE DOWNWARD. THIS CONDITION COULD CAUSE A LOSS OF THROTTLE CONTROL AND RESULT IN A VEHICLE CRASH.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
TRUCKS EQUIPPED WITH ANCHORLOCK AIR DRYERS. A DESIGN DEFICIENCY EXISTS IN THE AIR DRYER PIPING THAT CAN ALLOW MOISTURE FROM THE COMPRESSED AIR TO FREEZE ALLOWING A BUILD UP OF EXCESSIVE AIR PRESSURE THAT WOULD CAUSE THE AIR PIPING CONNECTIONS TO SEPARATE. THIS WOULD LEAD TO AN AUTOMATIC APPLICATION OF THE CHASSIS EMERGENCY SPIRNG BARKES AND TRAILER BREAKES, WITHOUT WARNING, AND POSSIBLY CAUSE A LOSS OF VEHICLE CONTROL.
A failure of this component (not entered) may increase the risk of a crash or injury.
Authorized dealerships will inspect the vehicle and complete all necessary repairs free of charge (parts and labor).
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