The 1974 Mack Ws has 7 NHTSA recall campaigns affecting an estimated 62,241 vehicles. Recall repairs are always free at any authorized dealer. Last updated July 5, 2026.
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.
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.
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 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…
MACK CAMPAIGN NO N/A.TRUCKS MFG'D APRIL 1, 1974 THRU NOV.15, 1974.POSSIBILITY THAT ON MODELS WITH OUTBOARD-MOUNTED BRAKE DRUMS AND STEEL DISCWHEEL ON ALUMINUM WHEEL HUBS, THE MANUFACTURING TOLERANCES MAY CAUSE ANINTERFERENCE PROBLEM BETWEEN THE INSIDE PORTION OF WHEEL AND OUTER EDGE OF CASTDRUM.THIS CONDITION RESULTS…
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1974 Mack Ws as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.