Macktrucks

January 22, 1999

United States

Mack Trucks, Inc.

VEHICLE DESCRIPTION: CLASS 8 HEAVY DUTY TRUCK CHASSIS EQUIPPED WITH MACK 16,000 LB. , 18,000 LB.

August 3, 1998

United States

Mack Trucks, Inc.

VEHICLE DESCRIPTION: FRONT DISCHARGE, REAR ENGINE MIXERS. THE FAN DRIVE PULLEY THAT ATTACHES TO THE WATER PUMP CAN SHOW EXCESSIVE AXIAL RUNOUT CAUSING THE FAN AND PART OF THE FAN DRIVE TO SEPARATE FROM THE DRIVE PULLEY.

December 29, 1997

United States

Mack Trucks, Inc.

VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH DESIGN LEVEL 1, ROCKWELL FF980 SERIES FRONT AXLE. THE FRONT AXLE HUB FLANGE CAN DEVELOP CRACKS DUE TO HIGH STRESS LEVELS.

November 17, 1997

United States

Mack Trucks, Inc.

VEHICLE DESCRIPTION: CLASS 8 HEAVY DUTY VEHICLES EQUIPPED WITH STEERING AXLE HUBS BUILT BY WEBB WHEEL FOR USE ON TRUCKS AND TRACTORS, PART NUMBERS WEBB 1530, VOLVO 90402-0006, OR EATON F1960. THE STEERING AXLE HUB FLANGE CAN FRACTURE AND SEPARATE FROM THE CENTER PORTION OF THE HUB.

November 1, 1997

United States

Mack Trucks, Inc.

VEHICLE DESCRIPTION: CLASS 8 HEAVY DUTY TRUCKS. DURING ASSEMBLY, INSUFFICIENT TORQUE OCCURRED OF THE DRAG LINK TO THE AXLE STEERING ARM CONNECTION.

October 20, 1997

United States

Mack Trucks, Inc.

VEHICLE DESCRIPTION: FRONT DISCHARGE MIXER CHASSIS. THE ORIGINAL EQUIPMENT MITER BOXES HAVE NO PROTECTIVE BOOTS ON THE SHAFTS AND DIRT CAN ENTER THE SYSTEM CAUSING THE GEAR SHAFT BEARINGS TO DETERIORATE.

December 23, 1996

United States

Mack Trucks, Inc.

THE U-JOINT BEARING STRAP BOLTS WERE NOT PROPERLY TIGHTENED DURING ASSEMBLY.

November 1, 1994

United States

Mack Trucks, Inc.

THE DRIVESHAFT CENTER BEARING SUPPORT BRACKET CAN CRACK AND BREAK.

October 21, 1994

United States

Mack Trucks, Inc.

THE STEERING GEARBOX MOUNTING FASTENERS WERE NOT PROPERLY HEAT TREATED.

October 9, 1994

United States

Mack Trucks, Inc.

THE STEERING ARM CAN DEVELOP CRACKS CAUSING THE LEVER TO BREAK WITHOUT WARNING.

February 15, 1994

United States

Mack Trucks, Inc.

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.

November 1, 1993

United States

Mack Trucks, Inc.

THE DRIVESHAFT TO THE FRONT DRIVING AXLE IS SECURED TO A BRACKET USING TWO PILLOW BLOCKS. THESE BLOCKS ARE OF INSUFFICIENT STRENGTH TO SUPPORT THE DRIVESHAFT AND COULD FAIL.

August 20, 1993

United States

Mack Trucks, Inc.

THE ENGINE COOLING FAN BLADES MAY BREAK DUE TO INADEQUATE BLADE STRENGTH AROUND THE RIVETS THAT ATTACH THE BLADES TO THE FAN SPIDER.

February 16, 1993

United States

Mack Trucks, Inc.

THE CARRIER YOKE BOLTS WERE MANUFACTURED WITH WORN ROLLING THREAD DIES, CAUSING STRESS CONCENTRATIONS WHICH CAUSED CRACKS DURING THE QUENCHING PROCESS.

August 7, 1992

United States

Mack Trucks, Inc.

THE CROSS STEERING LEVERS INTERCONNECTING THE LEFT AND RIGHT HAND STEERING KNUCKLES TO MAINTAIN ALIGNMENT WERE MANUFACTURED FROM INFERIOR MATERIALS AND FAIL IN LOW IMPACT SITUATIONS.

October 21, 1991

United States

Mack Trucks, Inc.

THE STONE BENNETT SHIFTERS DO NOT INDICATE THE RELATIVE POSITION OF THE SHIFT LEVER TO THE DRIVER.

June 25, 1991

United States

Mack Trucks, Inc.

LAP AND SHOULDER SEAT BELT ARRANGEMENT FOR FIXED (NON-SUSPENSION) SEATS DOES NOT MEET THE SEAT BELT LOADING REQUIREMENTS OF FMVSS 210. THE INBOARD CLINCH NUT IN CAB SILL, WHERE THE BUCKLE FOR THE SHOULDER AND LAP BELT IS MOUNTED, PULLED OUT OF THE SILL DURING THE TESTS.

May 23, 1991

United States

Mack Trucks, Inc.

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 .

May 1, 1991

United States

Mack Trucks, Inc.

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.

June 15, 1990

United States

Mack Trucks, Inc.

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