The 1973 Mack R has 9 NHTSA recall campaigns affecting an estimated 57,293 vehicles. Recall repairs are always free at any authorized dealer. Last updated July 5, 2026.
DEFICIENCIES, IN THE FORM OF FORGING LAPS, CRACKS AND EXCESSIVE DECARBURIZATION DURING HEAT TREATMENT, EXIST IN THE STEERING KNUCKLES. STRESSES IMPOSED WITH INTEGRAL HYDRAULIC POWER STEERING MAY LEAD TO A FAILURE IN THE AREA OF THE STEERING ARM ATTACHING BOSS. THIS TYPE OF FAILURE WOULD CAUSE LOSS OF STEERING CONTROL.
DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE LEFT STEERING KNUCKLE WITH AN IMPROVED TYPE OF KNUCKLE.
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.
MACK CAMPAIGN NO SC074.TRUCK-TRACTOR EQUIPPED WITH ROCKWELL INTERNATIONALSTEERING ARM.POSSIBILITY THAT THE STEERING ARM MAY CONTAIN A FORGING FLAWWHICH COULD RESULT IN A FAILURE DURING NORMAL OPERATION.FAILURE OF THESTEERING ARM COULD LEAD TO A LOSS OF VEHICLE CONTROL WITHOUT PRIOR WARNING TOTHE DRIVER WITH POSSIBLE…
MACK TRUCKS CAMPAIGN NO SC060.TRUCKS MFG'D 1967 THRU JAN.31, 1973.POSSIBILITY THAT THE SUSPENSION TRUNNION BRACKETS MAY DEVELOP CRACKS.IF SUCHCONDITION EXISTS AND CRACKS ARE NOT DETECTED, CONTINUED OPERATION COULDULTIMATELY LEAD TO TRUNNION TUBE SEPARATION FROM THE TRUNNION AND PERMIT AXLEASSEMBLY DISLOCATION.FAILURE…
MACK CAMPAIGN NO SCO#46.MODELS EQUIPPED WITH TURBO UNLOADER.MAR 1969 THRUNOV 1973.TRUCKS.POSSIBILITY THAT THE OIL SUPPLY LINE TO THE TURBO UNLOADERIS ROUTED TOO CLOSE TO THE TURBO CHARGER.IF THIS CONDITION EXISTS, HEAT COULDCAUSE HOSE DETERIORATION AND OIL LEAKAGE WHICH COULD CREATE A FIRE HAZARD.(CORRECT BY…
MACK CAMPAIGN NO SCO#45.EQUIPPED WITH FA535 FRONT AXLE.TRUCKS.POSSIBILITYTHAT THE AXLE BEAM MAY HAVE SURFACE CRACKS ON THE UNDERSIDE BELOW THE SPRINGPADS.SUCH CRACKS COULD OVER A LONG PERIOD OF TIME PROGRESS TO BEAM FAILUREAND LOSS OF VEHICLE CONTROL.(CORRECT BY INSPECTING AND REPLACING WHERENECESSARY).
MACK CAMPAIGN NO 55.MFG'D JAN.1, 1973 THRU AUG.14, 1974.POSSIBILITYTHAT VEHICLES EQUIPPED WITH A TRACTOR PROTECTION VALVE AN INTERFERENCE COULDOCCUR BETWEEN THE STOP LAMP SWITCH AND THE HEAD LAMP SWITCH COULD CREATE ASHORT CIRCUIT THAT WOULD INTERRUPT HEAD LAMP OPERATION.(CORRECT BY INSPECTINGAND PROVIDING ADDITIONAL…
MACK TRUCKS CAMPAIGN NO N/A.MANUF'D FEB.1971 THRU JUNE 1973.TRUCKS.POSSIBILITY THAT THE ELECTRIC HORN MOUNTING BRACKET COULD CRACK AND FAIL.IFTHIS CONDITION EXISTS THE HORN COULD INTERFERE WITH STEERING SHAFT UNIVERSALJOINT AND CAUSE STEERING LOCKUP IN A LEFT HAND TURN SITUATION.(CORRECT BYINSPECTING AND REPLACING…
EQUIPPED WITH ANCHORLOK SPRING BRAKE CHAMBERS.MANF'D JAN.1971 THRU MARCH1973.TRUCKS.POSSIBILITY THAT THE CLAMP RINGBOLTS ON THE ANCHORLOK SPRINGBRAKE CHAMBER WERE INCORRECTLY POSITIONED AT TIME OF INSTALLATION.IN THISPOSITION THE END OF THE BOLT MAY CONTACT REAR AXLE HOUSING DURING BRAKEACTUATION.DUE TO BRACKET…
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1973 Mack R as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.