Mack Trucks, Inc.: Safety Recalls in 1991

Updated on March 19, 2026.

There were 4 safety recalls made by Mack Trucks, Inc. in 1991. See the details of the recalls below.

You can also see similar information for other manufacturers.

Data Source: NHTSA.

See this for other years:

October 21, 1991

(Campaign #: NR (Not Reported))

POWER TRAIN:TRANSMISSION:4 SPEED:SHIFT PATTERN IND

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

NHTSA ID: 91V196000

Component: POWER TRAIN

# of Units Affected: 308

Consequence Summary:

THE SHIFT LEVER DOES NOT MEET THE REQUIREMENTS OF FMVSS102.

Corrective Action:

INSTALL A DECAL DISPLAYING THE RELATIVE SHIFT POSITIONS.

Park Outside Advisory: No

Do not Drive Advisory: No

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June 25, 1991

(Campaign #: NR (Not Reported))

INTERIOR SYSTEMS:ACTIVE SEAT AND SHOULDER BELTS AN

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. CONSEQUENCE OF DEFECT: IF SEAT BELT ANCHIRAGE FAILS, THE SEAT OCCUPANT FACES AN INCREASED RISK OF INJURY IN AN ACCIDENT OR SUDDEN STOP.

NHTSA ID: 91V112000

Component: SEAT BELTS

# of Units Affected: 4,000

Consequence Summary:

Corrective Action:

RELOCATE THE INBOARD SEAT BELT MOUNTING FROM TOP OF THE SILL TO THE FORWARD FLANGE OF THE SILL ON THE CAB FLOOR, AND ADD A 3MM FILLET WELD AROUND THE 2 INBOARD CLINCH NUTS.

Park Outside Advisory: No

Do not Drive Advisory: No

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May 23, 1991

(Campaign #: NR (Not Reported))

STEERING:POWER ASSIST:HYDROBOOST UNIT

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 .

NHTSA ID: 91V080000

Component: STEERING

# of Units Affected: 35

Consequence Summary:

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

Corrective Action:

REPLACE INCORRECTLY BUILT BOOST CYLINDERS.

Park Outside Advisory: No

Do not Drive Advisory: No

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May 1, 1991

(Campaign #: NR (Not Reported))

STEERING:LINKAGES:ARM:PITMAN

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.

NHTSA ID: 91V070000

Component: STEERING

# of Units Affected: 3,673

Consequence Summary:

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

Corrective Action:

REPLACE THE DEFECTIVE STEERING ARMS.

Park Outside Advisory: No

Do not Drive Advisory: No

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