Mack CF recalls by model year

Reported: 1972-01-20 (January 20, 1972) · Model years: 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971

Reported: 1991-05-01 (May 1, 1991) · Model years: 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990

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.

Reported: 1968-12-16 (December 16, 1968) · Model years: 1968

Reported: 1972-05-22 (May 22, 1972) · Model years: 1970, 1971

Reported: 1975-07-28 (July 28, 1975) · Model years: 1972, 1973, 1974, 1975

Reported: 1977-10-12 (October 12, 1977) · Model years: 1972, 1973, 1974, 1975, 1976, 1977

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.

Remedy: DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.

Reported: 1974-12-02 (December 2, 1974) · Model years: 1973

Reported: 1974-06-24 (June 24, 1974) · Model years: 1973, 1974

Reported: 1985-11-26 (November 26, 1985) · Model years: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985

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.

Reported: 1978-08-08 (August 8, 1978) · Model years: 1974, 1975, 1976, 1977, 1978

THE EXISTING CROSS STEERING ARMS MAY HAVE INSUFFICIENT FATIGUE LIFE IN THE NECK AREA. THIS IS NEAR THE BOSS FOR THE CROSS STEERING TUBE BALL JOINT CONNECTION. FAILURE OF EITHER OF THE CROSS STEERING LEVERS COULD LEAD TO LOSS OF STEERING CONTROL OF THE RIGHT FRONT WHEEL.

Remedy: THE DEALER WILL INSPECT AND, IF NECESSARY, INSTALL CROSS STEERING ARMS OF IMPROVED DESIGN AND GREATER STRENGTH.

Reported: 1981-12-29 (December 29, 1981) · Model years: 1976, 1977, 1978, 1979, 1980, 1981

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.

Reported: 1983-04-05 (April 5, 1983) · Model years: 1976, 1977, 1978, 1979, 1980, 1981

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.

Reported: 1977-06-17 (June 17, 1977) · Model years: 1977

THE FRONT WHEEL RIM CLAMP STUDS, INSTALLED ON THE INVOLVED VEHICLES, MAY NOT HAVE BEEN MANUFACTURED CORRECTLY, CAUSING A BRITTLE CONDITION IN THE THREAD ROOT AREA. THE STUDS COULD EVENTUALLY CRACK AND BREAK WHEN WHEEL NUTS ARE TIGHTENED TO SPECIFICATIONS.

Remedy: THE DEALER WILL REPLACE ALL SUSPECT FRONT WHEEL STUDS, WITHOUT CHARGE TO OWNER.

Reported: 1977-10-12 (October 12, 1977) · Model years: 1977

THE INVOLVED VEHICLES DO NOT CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 209, "SEATBELT ASSEMBLIES". ALTHOUGH THE SEATBELTS IN QUESTION PERFORMED MARGINALLY WITH RESPECT TO THE 5000 LB. LOAD REQUIREMENT, ADDITIONAL TESTING CONFIRMED THAT THE ANCHOR COULD FAIL, ALLOWING EITHER THE ANCHOR TO SLIP OVER THE HOLD-DOWN NUT OR THE ANCHOR TO SEPARATE INTO TWO PIECES.

Remedy: DEALER WILL INSPECT AND, IF NECESSARY, REPLACE SEAT BELT ASSEMBLIES WITHOUT CHARGE TO OWNER.

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: 1986-05-27 (May 27, 1986) · Model years: 1984, 1985, 1986

AN INCORRECT STEERING SHAFT RETAINING NUT IS INSTALLED ON THE SHAFT AND CAN LOOSEN CAUSING STEERING PLAY. CONSEQUENCE OF DEFECTS: IF NUT IS NOT REPLACED, STEERING WHEEL DISENGAGEMENT COULD OCCUR CAUSING LOSS OF STEERING CONTROL AND POSSIBLY A VEHICLE CRASH.

Remedy: INSTALL PROPER NUT TO ENSURE STEERING WHEEL RETENTION.

Reported: 1990-06-15 (June 15, 1990) · Model years: 1985, 1986, 1987, 1988

WELDING DEFICIENCIES CAN CAUSE TWO-PIECE STEERING GEAR MOUNTING BRACKET TO PROGRESSIVELY SEPARATE.

Consequence: THIS COULD RESULT IN LOSS OF STEERING CONTROL, WITHOUTPRIOR WARNING, AND A VEHICLE CRASH.

Remedy: REPLACE STEERING GEAR MOUNTING BRACKETS WITH PROPERLY WELDED BRACKETS.

Reported: 1987-11-23 (November 23, 1987) · Model years: 1987

CROSS STEERING LEVERS MAY BE IMPROPERLY HEAT TREATED AND SUBJECT TO FAIL DURING NORMAL OPERATION.

Consequence: SUCH FAILURE COULD CAUSE LOSS OF TRUCK CONTROL WITHOUTPRIOR WARNING AND RESULT IN A CRASH.

Remedy: INSTALL NEW, PROPERLY HEAT TREATED STEERING LEVER.

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: 1994-02-15 (February 15, 1994) · Model years: 1987, 1988, 1989, 1990, 1991, 1992

FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.

Consequence: IN THE EVENT THE PRIMARY THROTTLE RETURN FAILS, FAILURE OF THE SECONDARY THROTTLE RETURN SYSTEM WOULD NOT PROVIDE PROTECTION AGAINST LOSS OF THROTTLE CONTROL.

Remedy: A NEW PRODUCTION SECONDARY THROTTLE RETURN SYSTEM CONFIGURATION WILL BE INSTALLED.

Reported: 1989-09-29 (September 29, 1989) · Model years: 1988, 1989

AIR PIPING IS INSTALLED IN A WAY THAT COULD CAUSE FRONT BRAKE HOSES TO RUB AGAINST THE BRAKE CHAMBER.

Consequence: THIS COULD EVENTUALLY RESULT IN BRAKE HOSE FAILURE. INCREASING THE STOPPING DISTANCE, WHICH COULD RESULT IN AN ACCIDENT.

Remedy: REPAIR IN A MANNER TO PREVENT FRONT BRAKE HOSE FROM RUBBING AGAINST THE BRAKE CHAMBER.

Reported: 1991-05-23 (May 23, 1991) · Model years: 1988, 1989

INCORRECT MANUFACTURE OF THE HYDROBOOST CYLINDER ALLOWS THE BALL SOCKET CLAMP TO CONTACT RIGHT SIDE STEERING LEVER ON AN EXTREME LEFT TURN AND CAUSE FLEXING OF THE CYLINDER ROD .

Consequence: THIS FLEXING CAN CAUSE SEAL FAILURE OR CYLINDER FAILUREOF THE HYDROBOOST UNIT AND RESULT IN LOSS OF STEERING CONTROL AND RESULT IN AVEHICLE ACCIDENT.

Remedy: REPLACE INCORRECTLY BUILT BOOST CYLINDERS.