1981 Mack Mc Series Recalls

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NHTSA Campaign Number: 84V036000
Manufacturer: Mack Trucks, Inc.
Manufactured Begin Date: October 1st, 1978
Manufactured End Date: May 1st, 1982

Defect Summary:
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.

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

Recall Notes:
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.

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NHTSA Campaign Number: 81V155000
Manufacturer: Mack Trucks, Inc.
Manufactured Begin Date: August 1st, 1981
Manufactured End Date: September 1st, 1981
Date of Owner Notification: June 23rd, 1982

Defect Summary:
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.

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

Recall Notes:
VEHICLE DESCRIPTION: TRUCKS.SYSTEM: STEERING; PITMAN ARM RETAINING BOLTS.CONSEQUENCES OF DEFECT: SHOULD THIS LOOSE CONDITION GO UNCORRECTED, THE SPLINEDGROOVES ON THE OUTPUT SHAFT COULD WEAR SMOOTH, CAUSING LOSS OF STEERINGCONTROL, WITHOUT PRIOR WARNING, AND A VEHICLE ACCIDENT.

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NHTSA Campaign Number: 81V083000
Manufacturer: Mack Trucks, Inc.
Manufactured Begin Date: March 1st, 1978
Manufactured End Date: May 1st, 1981
Date of Owner Notification: February 26th, 1982

Defect Summary:
THE RIGHT HAND FRONT CANOPY CAB MOUNTING BRACKET INTERFERES WITH THE RIGHT HAND BRAKE CHAMBER ON THE STEERING AXLE WHEN IN A CERTAIN DEGREE TURN AND SEVERE BUMPING IS PRESENT.

Corrective Summary:
THE FRONT CANOPY CAB MOUNTING BRACKET WILL BE MODIFIED TO ALLOW FOR CLEARANCE OF THE RIGHT HAND FRONT BRAKE CHAMBER, WITHOUT CHARGE TO OWNER.

Recall Notes:
VEHICLE DESCRIPTION: TRUCKS.SYSTEM: STRUCTURE; FRONT CANOPY CAB MOUNTING BRACKET.CONSEQUENCES OF DEFECT: IF THIS INTERFERENCE SHOULD OCCUR IT MAY RESULT INDEGRADED BRAKING ABILITY WITHOUT PRIOR WARNING WITH THE POTENTIAL FOR A VEHICLEACCIDENT.