The 1971 Mack U has 5 NHTSA recall campaigns affecting an estimated 13,481 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.
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 TRUCKS CAMPAIGN NO N/A.WITH SN56 AND SW57 BOGIE HOUSINGS.BUILT MAR1971 THRU JUN 1972.TRUCKS.POSSIBILITY THAT THE BOGIE HOUSING WALL THICKNESSAT THE LEFT INNER WHEEL BEARING RACE MAY NOT MEET SPECIFIC DIMENSIONALREQUIREMENTS.IF THIS CONDITION EXISTS, IT COULD LEAD TO SPINDLE FAILURE,RESULTING IN LOSS OF A REAR…
MACK SERVICE BULLETIN NO G1003.EQUIPPED WITH AMERICAN-BOSCH APE-8VBB FUELINJECTION PUMP.MANFD 9-70 THRU 10-16 1971.TRUCKS.POSSIBILITY THAT LINKCONNECTING GOVERNOR FULCRUM LEVER TO FUEL INJECTION PUMP CONTROL RACKS CANBREAK AND CAUSE LOSS OF FUEL DELIVERY CONTROLTO ENGINE.SHOULD THIS CONDITIONOCCUR, IT COULD IMPAIR…
MACK CAMPAIGN NO R1005.EQUIPPED W/SGP48.TRUCKS.POSSIBILITY THAT IF PITMANARM IS NOT RELOCATED AND STEERING LINKAGE READJUSTED, POSSIBLE TOGGLE CONDITIONWILL RESULT IN EXTREME RIGHT TURN.(CORRECT BY INSPECTING AND MAKING NECESSARYADJUSTMENTS.).
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1971 Mack U as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.