1985 Mack MACK recalls

SOME AIR BRAKE HOSE ASSEMBLIES MAY NOT COMPLY WITH BURST STRENGTH REQUIREMENTS OF FMVSS 106.

Consequence

VEHICLES DO NOT COMPLY WITH STANDARD.

Remedy

REPLACE SUSPECT HOSE ASSEMBLIES.

SYSTEM: AIR BRAKE HOSE ASSEMBLY/FMVSS 106.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.

FRONT STEERING KNUCKLE THRUST BEARING MAY SHATTER INTO PIECES DUE TO IMPROPER HEAT TREATMENT. CONSEQUENCE OF DEFECT: FAILURE OF THE BEARING MAY AFFECT STEERING CONTROL. IF BEARING DISINTEGRATES, IT WOULD RESULT IN INCREASE STEERING DRAG AND/OR CAUSE STEERING LOCK UP WITH LOSS OF CONTROL WHICH COULD LEAD TO AN ACCIDENT.

Remedy

REPLACE DEFECTIVE THRUST BEARINGS.

SYSTEM: STEERING KNUCKLE. VEHICLE DESCRIPTION: ALL MODELS EQUIPPED WITH A FA536, FA537, OR FA538 SERIES FRONT STEERING AXLE.

AN INCORRECT 3/4 INCH BOLT WAS INSTALLED ON RT/RS 450 SUSPENSION.

Consequence

THIS BOLT MAY BREAK, CAUSING DISENGAGEMENT OF THE BEAM CONNECTION OF REAR SUSPENSION, RESULTING IN LOSS OF CONTROL, WHICH COULD RESULT IN AN ACCIDENT.

Remedy

RETROFIT CHASSIS WITH 1 INCH BOLTS.

SYSTEM: SUSPENSION.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS BUILT WITH HENDRICKSON RT/RS 450SUSPENSION.

CROSSMEMBER CAN BE OVERSTRESSED AND CAN FAIL, ALLOWING THE BROKEN CROSSMEMBER TO PROTUDE ABOVE THE TOP OF THE FRAME AND INTERFERE WITH CHASSIS COMPONENTS.

Consequence

TRAILER HANDLING COULD BE AFFECTED DURING TURNINGMANEUVERS WHICH COULD RESULT IN LOSS OF TRUCK CONTROL AND A CRASH. ALSO, ACOMPLETELY SEPARATED CROSSMEMBER COULD AFFECT HEIGHT OF SUSPENSION AIR SPRINGSAND THE RESULTING LEAN COULD RESULT IN LOSS OF CONTROL.

Remedy

INSTALLATION OF A BOLTED DOUBLE PLATE TYPE CROSSMEMBER TO REPLACE THE STANDARD CHANNEL TYPE CROSSMEMBER.

SYSTEM: REAR CROSSMEMBER WITH NEWAY AIR SUSPENSION.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS:DM,F,FM,MC,MCE,MH,MR,R,RD,RS,RL,RW,RWL,RWS AND U MODELS EQUIPPED WITH NEWAY AIRRIDE DRIVE AXLE SUSPENSION.

THE 7/8 INCH SPRING EYE BOLTS WITHIN THE SPRING EYE BUSHING HANGER BRACKET OF THE REAR SUSPENSION MAY FAIL.

Consequence

THE SPRING COULD FALL ONTO THE ROAD SURFACE, WITHOUT WARNING TO THE DRIVER, AND A VEHICLE CRASH COULD OCCUR DUE TO THE SUDDEN DRAG OF THE SPRING.

Remedy

REPLACE ALL 7/8 INCH DIAMETER SPRING EYE BOLTS WITH 1 INCH DIAMETER BOLTS.

SYSTEM: SUSPENSION; SPRING EYE BOLT.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS WITH ST34 OR ST 38 REAR SUSPENSION.

THE SPRING EYE BOLT WAS NOT TORQUED PROPERLY AND COULD FAIL DUE TO THE LOOSE FIT WITHIN THE SPRING EYE BUSHING/HANGER BRACKET. CONSEQUENCE OF DEFECT: THE SPRING COULD FALL ONTO THE ROAD SURFACE, WITHOUT WARNING TO THE DRIVER, AND A VEHICLE CRASH COULD OCCUR DUE TO THE SUDDEN DRAG OF THE SPRING.

Remedy

NOT AVAILABLE AT THIS TIME. IN THE INTERIM THE TORQUE OF THE SPRING EYE BOLT WILL BE CHECKED.

SYSTEM: SPRING EYE BOLT.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS WITH ST34 OR ST38 SERIES REAR AXLE.

INCORRECT INNER WHEEL BEARINGS WERE INSTALLED IN THE REAR AXLES WHICH WEARS A GROOVE IN THE SPINDLE DUE TO A POOR FIT. CONSEQUENCE OF DEFECT: A DEEP GROOVE COULD CAUSE THE AXLE HOUSING TO BREAK AND RESULT IN A VEHICLE CRASH WITHOUT PRIOR WARNING.

Remedy

REPLACE INNER WHEEL BEARING WITH CORRECT BEARING. ALSO, IF A GROOVE IS PRESENT, REMOVE THE GROOVE AND ASSURE THAT NO CRACKS ARE PRESENT. REPLACE HOUSING IF CRACKED.

SYSTEM: REAR AXLE INNER BEARING.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH MACK SS440C OR SW440C REAR AXLE.