Mack R SERIES recalls by model year

Reported: 1980-05-06 (May 6, 1980) · Model years: 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976

THE STEERING ARM MAY DEVELOP CRACKS DUE TO INSUFFICIENT FATIGUE LIFE IN THE MACHINE RADIUS OF THE TAPER AT THE STEERING KNUCKLE END.

Remedy: INSTALL STEERING ARMS THAT HAVE BEEN MAGNA-FLUX INSPECTED FOR CRACKS AND SHOT PEENED FOR IMPROVED FATIGUE LIFE. THIS WILL BE DONE WITHOUT CHARGE.

Reported: 1980-05-06 (May 6, 1980) · Model years: 1976, 1977, 1978, 1979, 1980

THE PREFABRICATED PINCH BOLT CLAMP AT THE LOWER STEERING SHAFT LOWER YOKE MAY NOT PERFORM ADEQUATELY WHEN TIGHTENED TO SPECIFICATIONS. THE CLAMP MAY THEN DEFORM AND LOSS OF CLAMPING FORCE AND STEERING SHAFT DISENGAGEMENT MAY RESULT.

Remedy: DEALER WILL RETROFIT WITH LOWER STEERING SHAFT LOWER YOKES THAT PROVIDE FOR INTEGRAL PINCH BOLT INSTALLATION IN PLACE OF PREVIOUS SEPARATELY FABRICATED CLAMP FOR THE PINCH BOLT.

Reported: 1981-12-29 (December 29, 1981) · Model years: 1977, 1978, 1979, 1980, 1981

THE RIGHT HAND CLEARANCE LAMP IS OBSCURED, FROM CERTAIN ANGLES OF VISION, BY THE IN-LINE PRECLEANER AIR CLEANER CAP. THE INVOLVED VEHICLES FAIL TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT".

Remedy: DEALER WILL REPLACE THE AIR CLEANER WITH ONE OF ACCEPTABLE HEIGHT.

Reported: 1984-03-23 (March 23, 1984) · Model years: 1978, 1979, 1980, 1981, 1982

SPRING SEAT CAN DEFORM, WHICH CAUSES A DECREASE IN THE CLAMPING FORCE IN THE SUSPENSION ASSEMBLY. LOSS OF CLAMPING FORCE MAY BRING ABOUT AXLE MISALIGNMENT OR AXLE HOUSING FAILURE.

Remedy: THE AXLE HOUSING WILL BE INSPECTED AND REPLACED, IF NECESSARY. THE SPRING SEATS WILL ALSO BE REPLACED.

Reported: 1980-05-06 (May 6, 1980) · Model years: 1979, 1980

ON CERTAIN VEHICLES, THE KNOB THAT OPERATES THE TRACTOR PARK VALVE MAY BREAK OFF, RENDERING THE VALVE INOPERABLE.

Remedy: DEFECTIVE KNOBS WILL BE REPLACED WITH AN IMPROVED TYPE, WITHOUT CHARGE TO OWNER.

Reported: 1981-07-08 (July 8, 1981) · Model years: 1979, 1980

THE RETAINING PIN FOR THE BRAKE CONTROL KNOB HAS BEEN MISALIGNED (OFF THE CENTER LINE OF THE VALVE PLUNGER HOLE). THIS CAUSES THE KNOB TO BE OVERSTRESSED AT THE RETAINING PIN HOLE AREA CAUSING IT TO SEPARATE FROM THE VALVE.

Remedy: THE HOLES WILL BE RETOOLED TO PROVIDE CORRECT ALIGNMENT AND PLASTIC KNOBS WILL BE REPLACED BY KNOBS OF STRONGER MATERIAL HAVING METAL REINFORCEMENTS.

Reported: 1980-12-10 (December 10, 1980) · Model years: 1980

THE WELD ON THE UPPER STEERING SHAFT WHERE THE FEMALE SPLINE CONNECTS TO THE TUBE ASSEMBLY MAY HAVE BEEN INCORRECTLY POSITIONED AND ACTUALLY MISSED THE SEAM.

Remedy: THE DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE AFFECTED SHAFT WITH ONE THAT HAS BEEN PROPERLY WELDED, AT NO CHARGE.

Reported: 1981-12-29 (December 29, 1981) · Model years: 1981

THE PITMAN ARM RETAINING BOLT MAY NOT HAVE BEEN TIGHTENED TO THE REQUIRED SPECIFICATIONS DUE TO A DESIGN CHANGE. INADEQUATE RETENTION OF THE BOLT TO THE OUTPUT SHAFT COULD ALLOW THE PITMAN ARM TO LOOSEN.

Remedy: THE DEALER WILL INSPECT AND, IF NECESSARY, RETORQUE THE RETAINING BOLT TO PROPER SPECIFICATIONS AT NO CHARGE.

Reported: 1986-01-17 (January 17, 1986) · Model years: 1981, 1982, 1983, 1984

THE ACCELERATOR ROD HOLE CLEARANCE IS NOT ADEQUATE AND CAN CAUSE THE ACCELERATOR LINKAGE TO BIND. CONSEQUENCE OF DEFECT: IF BINDING OCCURS WHILE IN A FULL THROTTLE POSITION, ACCELERATOR CONTROL WOULD BE LOST WITHOUT WARNING AND AN ACCIDENT COULD OCCUR.

Remedy: ENLARGE THE ACCELERATOR ROD HOLE TO ELIMINATE INTERFERENCE WITHIN ACCELERATOR LINKAGE.

Reported: 1984-03-22 (March 22, 1984) · Model years: 1983, 1984

IMPROPER STEERING CLAMP BOLTS AND TORQUE APPLIED DURING INSTALLATION. THE BOLT COULD FAIL, ALLOWING THE STEERING YOKE TO BECOME LOOSE.

Remedy: INSPECTION AND, IF NECESSARY, INSTALLATION OF PROPER STEERING SHAFT CLAMP BOLTS TIGHTENED TO SPECIFICATIONS.

Reported: 1988-09-27 (September 27, 1988) · Model years: 1987

FASTENERS THAT HOLD THE REAR WHEEL TO THE HUB AND DRUM ASSEMBLY MAY BE IMPROPERLY TORQUED.

Consequence: AN UNDERTORQUED FASTENER WILL LOOSEN UP AND CAN RESULT INWHEEL SEPARATION, LOSS OF CONTROL, AND AN ACCIDENT.

Remedy: PROPERLY TORQUE REAR WHEEL SPACE FASTENERS.

Reported: 1988-10-18 (October 18, 1988) · Model years: 1987, 1988

THERE MAY BE INSUFFICIENT WELD WHERE THE STEP IS WELDED TO THE FUEL TANK.

Consequence: WELD CRACKS COULD EVENTUALLY CAUSE STEPS TO DISENGAGEAND POSSIBLY INJURE PERSONS ENTERING OR LEAVING THE TRUCK.

Remedy: REPLACE FUEL TANK STEPS WITH CRACKS; MODIFY OTHERS TO PREVENT STEP FROM SEPARATING FROM THE TANK.

Reported: 1989-03-03 (March 3, 1989) · Model years: 1987, 1988

AN INCORRECT HIGH PRESSURE POWER STEERING HOSE MAY HAVE BEEN INSTALLED.

Consequence: UNDER CERTAIN CONDITIONS, HOSE COULD FAIL RESULTING INLOSS OF POWER STEERING ASSIST AND POSSIBLY AN ACCIDENT.

Remedy: REPLACE INCORRECT POWER STEERING HOSES.

Reported: 1988-05-23 (May 23, 1988) · Model years: 1988

CLAMP PLATES USED BETWEEN THE DRIVE SHAFT AND CARRIER YOKES MAY CRACK AND COULD BREAK DUE TO IMPROPER HEAT TREATMENT.

Consequence: IF CLAMP PLATE BREAKS, YOKE WOULD FLY OFF AT DETACHEDPOINT AND COULD INJURY ANYONE STRUCK BY FLYING FRAGMENTS. ALSO, THE DETACHEDINNER SHAFT COULD INTERFERE WITH THE BRAKE SYSTEM AIR SUPPLY HOSES AND TRACTORTIRES, WHICH COULD RESULT IN LOSS OF TRUCK CONTROL AND AN ACCIDENT.

Remedy: INSTALL NEW CLAMPING PLATES AND CAPSCREWS IN ALL LOCATIONS AS NEEDED.

Reported: 1988-07-27 (July 27, 1988) · Model years: 1988

SOME OF THE NUTS/BOLTS USED TO FASTEN THE STEERING PITMAN ARM MAY LOOSEN.

Consequence: THIS WOULD ALLOW THE PITMAN ARM TO COME OFF THE STEERINGGEAR SECTOR SHAFT AND RESULT IN IMMEDIATE LOSS OF STEERING CONTROL AND A VEHICLECRASH COULD OCCUR.

Remedy: RETORQUE NUTS/BOLTS WHERE NECESSARY.

Reported: 1988-10-18 (October 18, 1988) · Model years: 1988

CERTAIN ENGINE SUPPORT CASTINGS WERE PRODUCED WITH FAULTY METALLURGY AND COULD FAIL.

Consequence: FAILURE OF ONE OR BOTH BRACKETS COULD CAUSE DISLOCATIONOF ENGINE AND TRANSMISSION ASSEMBLY, WHICH COULD RESULT IN TRUCK DISABLEMENT,POSSIBLE LOSS OF ACCELERATOR CONTROL AND AN ACCIDENT.

Remedy: REPLACE REAR ENGINE SUPPORTS AS NECESSARY.

Reported: 1989-05-22 (May 22, 1989) · Model years: 1988, 1989

STEERING WHEEL RETAINING NUTS MAY HAVE BEEN IMPROPERLY INSTALLED AND/OR TORQUED.

Remedy: RENEW AND RETORQUE STEERING WHEEL RETAINING NUTS.

Reported: 1989-05-15 (May 15, 1989) · Model years: 1989

TORQUE ROD BOLTS ARE GRADE 2 INSTEAD OF GRADE 5, WHICH IS NOT TO SPECIFICATION, AND COULD FAIL.

Consequence: BOLT FAILURE COULD ALLOW THE REAR AXLE TO SHIFT; THISCOULD ADVERSELY AFFECT TRUCK CONTROL AND COULD RESULT IN A CRASH.

Remedy: REPLACE TORQUE ROD BOLTS WITH BOLTS OF THE PROPER SPECIFICATION.