The 1975 Mack Ws has 13 NHTSA recall campaigns affecting an estimated 65,579 vehicles. Recall repairs are always free at any authorized dealer. Last updated July 5, 2026.
THE POSSIBILITY EXISTS THAT THE ALUMINUM ENGINE REAR SUPPORT BRACKETS MAY FAIL DUE TO METAL FATIGUE. THIS TYPE OF FAILURE WOULD ALLOW THE ENGINE AND TRANSMISSION ASSEMBLY TO DISLOCATE DOWNWARD. THIS WILL RESULT IN THROTTLE CONTROL LOSS WITH THE ENGINE OPERATING CONTINUOUSLY IN THE MID TO UPPER RANGE OF THE GOVERNED…
DEALER WILL INSPECT AND, IF NECESSARY, REPLACE ALUMINUM SUPPORT BRACKETS WITH BRACKETS MADE FROM DUCTILE IRON FOR INCREASED STRENGTH.
AN AXLE "NO BRAKE" CONDITION COULD RESULT FROM AN EATON CONTROLLER INTERNAL ELECTRICAL MALFUNCTION. THIS CONDITION MAY CAUSE THE ANTI-WHEEL LOCK VALVE SOLENOID TO BE CONTINUOUSLY ENERGIZED AND PREVENT THE BRAKES FROM BEING APPLIED ON ONE OF THE AXLES. AS A RESULT, THE ANTI-WHEEL LOCK WARNING LAMP IS NOT ACTIVATED.
THE DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE ANTI-WHEEL LOCK CONTROLLER WITHOUT CHARGE TO OWNER.
A DESIGN DEFICIENCY EXISTS IN THE AIR DRYER PIPING IN THE AREA OF THE PRESSURE RELIEF VALVE AND COMPRESSOR GOVERNOR CONTROL LINK. MOISTURE IS PASSED AND BUILDS UP IN THIS RELIEF VALVE AND CONTROL LINE. IN FREEZING AMBIENT TEMPERATURES, THIS MOISTURE MAY FREEZE, ALLOWING THE CHASSIS AIR SYSTEM PRESSURE TO EXCEED 150…
THE DEALER WILL RELOCATE THE AIR SYSTEM COMPRESSOR GOVERNOR LINE AND PRESSURE RELIEF VALVE TO ELIMINATE MOISTURE ACCUMULATION.
THE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.
DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.
THE LOWER STEERING SHAFT YOKE CLAMP BOLTS ON THE INVOLVED VEHICLES MAY NOT HAVE BEEN SUFFICIENTLY TIGHTENED. SHOULD THESE BOLTS LOSSEN AND COME OFF, THE LOWER STEERING SHAFT COULD SEPARATE FROM THE STEERING GEAR.
THE DEALER WILL SECURE THE CLAMP BOLT AND MAKE THE NECESSARY MODIFICATIONS ON THE LOWER STEERING SHAFT, FREE OF CHARGE.
CRACKS MAY BE PRESENT IN THE BRAKE SPIDER. THESE CRACKS COULD EVENTUALLY CAUSE THE BRAKE SPIDER TO FAIL. THIS COULD ALLOW SEPARATION OF THAT PORTION OF THE BRAKE SPIDER THAT RETAINS THE BRAKE CAMSHAFT, THE BRAKE CHAMBER, AND THE BRAKE CHAMBER BRACKET FROM THE FOUNDATION BRAKE ASSEMBLY. BRAKE PULL IN THE DIRECTION…
THE DEALER WILL INSPECT AND MODIFY THE AFFECTED BRAKE SPIDERS, FREE OF CHARGE.
MACK CAMPAIGN NO Q1014.TRUCK-TRACTOR EQUIPPED WITH FA536C AND FA537C SERIESFRONT AXLES.POSSIBILITY THAT THE FRONT AXLE MOUNTED BRAKE CHAMBER MAY CONTACTTHE CAB TILT CYLINDER, UNDER EXTREME AXLE ARTICULATION.IF THIS CONDITIONEXISTS, IT MAY RESULT IN AN INOPERATIVE FRONT BRAKE CAUSING LOSS OF BRAKEING ONTHE AFFECTED…
MACK CAMPAIGN NO SC075.TRUCKS.POSSIBILITY THAT A FAULTY WELD IN ATTACHINGTHE TUBULAR UPPER SECTION OF THE STEERING SHAFT TO THE SOLID LOWER SECTION.FAILURE OF THIS WELD ALLOWS INTERNAL SEPARATION OF THE STEERING SHAFT WITHRESULTANT COMPLETE LOSS OF STEERING CONTROL.THIS COULD RESULT IN LOSS OFVEHICLE CONTROL WITHOUT…
MACK CAMPAIGN NO SC072.TRUCKS EQUIPPED WITH EATON SKID CONTROL SYSTEM ANDROCKWELL INTERNATIONAL FF931 OR FL931 W FRONT AXLES WITH ALUMINUM WHEEL HUBS.POSSIBILITY THAT FULL ADJUSTMENT OF THE WHEEL SPEED SENSOR CANNOT BE OBTAINEDWITH THE PRESENT EATON WHEEL SPEED ROTOR.IF THIS RESULTS IN INTERFERENCEBETWEEN THE ROTOR…
MACK CAMPAIGN NO SC070.POSSIBILITY THAT A DISTORTION OF THE AIR-OPERATEDWINDSHIELD WIPER MOTOR HOUSING CAN ALLOW EXCESSIVE INTERNAL LEAKAGE.THISCONDITION COULD RESULT IN SLUGGISH WINDSHIELD WIPER OPERATION AND POSSIBLYFAILURE TO OPERATE WHEN ACTIVATED.(CORRECT BY INSPECTING AND REPLACING WITHNEW WIPER MOTOR AND…
MACK CAMPAIGN NO SCO-61.TRUCKS.POSSIBILITY THAT THE REINFORCEMENT INSERTSPECIFIED IN CONNECTOR USED WITH SYNFLEX HOSE MAY HAVE BEEN OMITTED.THISCONDITION COULD RESULT IN INADEQUATE RETENTION OF THE HOSE TO THE CONNECTOR ANDCOULD ALLOW HOSE TO DISCONNECT DURING BRAKE APPLICATION, CAUSING LOSS OFBRAKING ON THE AFFECTED…
MACK CAMPAIGN NO SCO-63.TRUCKS MFG'D DEC.12, 1974 THRU JUNE 30, 1975.POSSIBILITY THAT THE TRAILER SUPPLY CONTROL VALVE EXHAUST PORT WAS INADVERTENLYPLUGGED, AND THE SAFETY VALVE ON THE AIR RESERVOIR MAY HAVE BEEN OMITTED.IFTHIS CONDITION EXISTS IT COULD LEAD TO INTERMITTENT LOCKUP OF THE TRAILERBRAKES AND DIFFICULTY…
MACK CAMPAIGN NO SCO-62.TRUCKS MFG'D DEC.13, 1974 THRU JUNE 25, 1975.POSSIBILITY THE CLAMP AROUND THE STEERING COLUMN MAY HAVE BEEN INCORRECTLYPOSITIONED ON THE STEERING COLUMN, WHICH COULD RESULT IN STEERING SHAFT SPLINEENGAGEMENT BEING LESS THAN SPECIFIED.IF THIS CONDITION EXISTS IT COULD RESULTIN STEERING SHAFT…
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1975 Mack Ws as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.