1988 Mack RD SERIES recalls

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.

SYSTEM: ENGINE REAR SUPPORTS.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.

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.

SYSTEM: FUEL TANK STEP.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.

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.

SYSTEM: STEERING PITMAN ARM.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.

COMPRESSION OF FRONT SPRINGS COULD INTERFERE WITH THE 90 DEGREE CROSSOVER FITTINGS ON THE BOTTOM OF THE GEARS.

Consequence

IF ONE OF THE FITTINGS BREAK, THE HYDRAULIC FLUID ISLOST, RESULTING IN LOSS OF POWER STEERING AND POSSIBLY A CRASH.

Remedy

REPLACE CENTER PORT STEERING GEAR CYLINDER HEADS WITH NEW SIDE PORT CYLINDER HEADS. ALSO, INSTALL THICKER BUMPER STOPS TO ELIMINATE SPRING TO GEAR CONTACT.

SYSTEM: STEERING GEAR.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH SHEPPARD DUAL STEERINGGEARS AND 34.5 INCH SPRING CENTERS.

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.

SYSTEM: DRIVE SHAFT YOKE CLAMP PLATES.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.

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

Remedy

RENEW AND RETORQUE STEERING WHEEL RETAINING NUTS.

SYSTEM: STEERING WHEEL RETAINING NUTS.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS. CONSEQUENCE OF DEFECT: THIS COULD CAUSE STEERING WHEEL DISENGAGEMENT FROM THE STEERING COLUMN WITH LOSS OF STEERING CONTROL WHICH COULD RESULT IN ANACCIDENT.

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.

SYSTEM: POWER STEERING HOSE.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH STRATOFLEX HIGH PRESSUREPOWER STEERING HOSE.

DOWELS MAY HAVE BEEN OMITTED DURING SPRING CAP INSTALLATION; THIS WOULD PUT SHEAR LOAD ON THE FOUR (4) SPRING CAP BOLTS.

Consequence

THIS COULD RESULT IN LOOSENING AND FAILURE OF THE BOLTSWITH POSSIBLE LOSS OF CONTROL AND ACCIDENT POTENTIAL.

Remedy

INSTALL THE MISSING DOWELS TO PREVENT MOVEMENT BETWEEN THE SPRING CAP AND AXLE HOUSING.

SYSTEM: SPRING CAP TO AXLE HOUSING CONNECTION DOWEL.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.