1981 Mack CF recalls

THE FLOORBOARD OPENING AND THE STEERING COLUMN SEAL BRACKET MAY NOT ALLOW SUFFICIENT CLEARANCE FOR THE SHAFT TO TURN FREELY IN THE CENTER OF THE BRACKET/SEAL. THE PINCH BOLT IN THE COLUMN YOKE MAY BIND OR LOCK THE COLUMN AGAINST THE BRACKET, ALLOWING LITTLE OR NO WHEEL RETURN.

Remedy

DEALER WILL ENLARGE THE HOLE IN THE FLOORBOARD TO PROVIDE CLEARANCE FOR THE STEERING COLUMN U-JOINT PINCH BOLT. A NEW BRACKET AND CLAMP WILL ALSO BE INSTALLED WITHOUT CHARGE TO OWNER.

VEHICLE DESCRIPTION: TRUCK FIRE CHASSIS EQUIPPED WITH SGP48 STEERING GEAR.SYSTEM: STEERING; U-JOINT, FLOORBOARD.CONSEQUENCES OF DEFECT: IF THE STEERING ASSEMBLY LOCKS IN PLACE, LOSS OFVEHICLE CONTROL, WITHOUT WARNING, AND AN ACCIDENT COULD RESULT.

THE SPLINED STEERING SHAFT MAY NOT BE SUFFICIENTLY ENGAGED AS DESIGNED DUE TO INACCURATE DRILLING OF THE HOLES IN THE FRAME TO WHICH THE CAB FRONT MOUNT MEMBER IS BOLTED. UNDER CERTAIN CONDITIONS THE STEERING SHAFT MAY DISENGAGE. CONSEQUENCE OF DEFECT: A JARRING IMPACT MIGHT CAUSE DISENGAMENT OF THE SPLINED SHAFT RESULTING IN LOSS OF STEERING CONTROL AND POSSIBLY AN ACCIDENT.

Remedy

REPLACE SHAFTS WHICH MEASURE UNDER THE MINIMUM ENGAGEMENT DIMENSIONS WITH LONGER SHAFT.

SYSTEM: STEERING SHAFT. VEHICLE DESCRIPTION: FIRE TRUCKS.

STRESSES IMPOSED ON THE LEVER DURING TURNING MANEUVERS AND/OR IMPACT INCIDENTS, SUCH AS WOULD BE CAUSED BY CURBS OR ROAD SURFACE IRREGULARITY, REDUCE THE LIFE EXPECTANCY OF THE PART. THE STEERING LEVER MAY CRACK AND EVENTUALLY THE STRESSES COULD CAUSE THE STEERING LEVER TO BREAK.

Consequence

A BROKEN STEERING LEVER WILL CAUSE LOSS OF STEERINGCONTROL WITHOUT PRIOR WARNING WHICH MAY RESULT IN A VEHICLE CRASH.

Remedy

REPLACE THE DEFECTIVE STEERING ARMS.

SYSTEM: STEERING LEVERS.VEHICLE DESCRIPTION: CF MODEL FIRE CHASSIS WITH GROSS AXLE WEIGHT RATINGS OF12,000 POUNDS OR GREATER AND EQUIPPED WITH POWER STEERING.NOTE: THE SPECIFIC MACK AXLES AFFECTED ARE: FA532, FAF532, FAFW537, FAFW5372,FAFW13.5, FAW538, FAW14.3, FA604, FA6042, FAW616, FAW618, FAW617, AND FAW20.

ON THE INVOLVED VEHICLES THE FLOORBOARD OPENING AND THE STEERING COLUMN SEAL BRACKET DO NOT HAVE SUFFICIENT CLEARANCE TO ALLOW THE SHAFT TO TURN FREELY. THIS CAUSES THE PINCH BOLT TO BIND OR LOCK AGAINST THE SEAL BRACKET.

Remedy

THE HOLE IN THE FLOORBOARD WILL BE ENLARGED TO ALLOW SUFFICIENT CLEARANCE OF THE STEERING COLUMN U-JOINT PINCH BOLT, AND A NEW BRACKET AND LAMP WILL BE INSTALLED AT NO CHARGE TO OWNER.

VEHICLE DESCRIPTION: FIRE FIGHTING EQUIPMENT CHASSIS EQUIPPED WITH SGP48STEERING GEARS.SYSTEM: STEERING; STEERING COLUMN SHAFT U-JOINT CLEARANCES.CONSEQUENCES OF DEFECT: THERE WILL BE LITTLE OR NO WHEEL RETURN; LOSS OFSTEERING CONTROL WITHOUT PRIOR WARNING COULD RESULT IN AN ACCIDENT.

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.

VEHICLE DESCRIPTION: HEAVY TRUCKS.SYSTEM: SUSPENSION; REAR SPRING SEAT.CONSEQUENCES OF DEFECT: LOSS OF VEHICLE CONTROL COULD OCCUR WITHOUT WARNING,POSSIBLY RESULTING IN AN ACCIDENT.