Mack Mh Recalls & Complaints by Model Year

NHTSA lists 19 safety recalls and 0 owner complaints across 12 model years of the Mack Mh (1982–1993).

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• 1982
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• 1993

All Mack Mh recalls (19)

Every NHTSA safety campaign that lists a Mack Mh, most recent first, with the model years each one covers.

1. Vehicle speed control

   NHTSA 94V032000 Reported February 15, 1994 39,777 vehicles potentially affected MACK TRUCKS, INCORPORATED

   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.

   Remedy: A new production secondary throttle return system configuration will be installed.

   Model years: 1987, 1988, 1989, 1990, 1991, 1992

2. Trailer hitches

   NHTSA 93V024000 Reported February 16, 1993 4,924 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The carrier yoke bolts were manufactured with worn rolling thread dies, causing stress concentrations which caused cracks during the quenching process.

   Remedy: Replace the carrier yoke bolts.

   Model years: 1992, 1993

3. Suspension: front

   NHTSA 89V079000 Reported May 15, 1989 100 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Torque rod bolts are grade 2 instead of grade 5, which is not to specification, and could fail.

   Remedy: Replace torque rod bolts with bolts of the proper specification.

   Model years: 1989

4. Springs (suspension)

   NHTSA 89V033000 Reported March 3, 1989 152 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Dowels may have been omitted during spring cap installation; this would put shear load on the four (4) spring cap bolts.

   Remedy: Install the missing dowels to prevent movement between the spring cap and axle housing.

   Model years: 1988

5. Seat belts: rear/other

   NHTSA 89V024000 Reported February 21, 1989 19 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Seat tether belt 11.0 inches long was installed instead of the 8.5 inches long belt required for this chassis.

   Remedy: Install correct 8.5 inch seat tether belt.

   Model years: 1987, 1988

6. Seat belts

   NHTSA 88V147000 Reported September 6, 1988 11,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Seat tether belts may not have been adjusted during assembly.

   Remedy: Adjust seat tether belt if necessary.

   Model years: 1982, 1983, 1984, 1985, 1986, 1987, 1988

7. Linkages (steering)

   NHTSA 87V187000 Reported December 14, 1987 29 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The pitman arm to drag link angle is out of phase.

   Remedy: Replace mismarked pitman arm.

   Model years: 1987

8. Linkages (steering)

   NHTSA 87V179000 Reported November 23, 1987 323 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Cross steering levers may be improperly heat treated and subject to fail during normal operation.

   Remedy: Install new, properly heat treated steering lever.

   Model years: 1987

9. Linkages (steering)

   NHTSA 87V166000 Reported October 26, 1987 200 vehicles potentially affected MACK TRUCKS, INCORPORATED

   On right hand steering arm, keyway may be in the wrong location causing a toggle condition to occur under certain conditions.

   Remedy: Replace incorrect steering arm.

   Model years: 1986, 1987

10. Structure

    NHTSA 86V008000 Reported January 17, 1986 7,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

    Left or right cab step may crack in its welded area due to flexing of the step during entering and exiting. Consequence of defect: as the cracks extend, the tubular step could partially collapse and break without warning to the user, and could result in personal injuries.

    Remedy: Install a reinforcement brace if no cracks are found. In addition, replace step if cracks are present.

    Model years: 1982, 1983, 1984, 1985, 1986

11. Service brakes, air

    NHTSA 85V113000 Reported September 17, 1985 5,020 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The dual double check valve may not release the proper air volume to the brake system, causing a slight timing delay between the tractor and the trailer brake system. Consequences of defect: if the brakes are suddenly applied, the trailer could jackknife without warning to the operator, which could result in a vehicle crash.

    Remedy: Install two new sleeves in the dual double check valve which will increase air flow.

    Model years: 1982, 1983, 1984, 1985

12. Connection (steering)

    NHTSA 85V057000 Reported May 3, 1985 52 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The drag links may have been installed incorrectly allowing drag link clamp bolt to axle beam interference. Consequence of defect: during a turning maneuver, increased steering effort or complete lockup of steering could occur without warning. This could result in loss of truck control and a crash.

    Remedy: Assure that drag links are installed to correct interference condition.

    Model years: 1984, 1985

13. Bumpers (structure)

    NHTSA 85V051000 Reported May 1, 1985 7,500 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The flip out step clevis on the bumper may fail and break under the weight of the person standing on the step to service the front area of the vehicle. Consequence of defect: this sudden break will cause the person standing on the step to fall, without warning, and could result in injuries.

    Remedy: Remove the step clevis and replace with a new improved clevis.

    Model years: 1982, 1983, 1984, 1985

14. Fifth wheel assembly (trailer hitches)

    NHTSA 84V140000 Reported November 7, 1984 64 vehicles potentially affected MACK TRUCKS, INCORPORATED

    Due to improper and inadequate welding practices, the fifth wheel on the involved vehicles is defective. Frame mounted supports may have incomplete or poor quality welds. The welds could subsequently fail allowing separation of the tractor from the trailer.

    Remedy: The dealer will inspect and remove the fifth wheel and reweld the mounting angles at no charge to the owner.

    Model years: 1982, 1983, 1984

15. Latch (latches/locks/linkages)

    NHTSA 84V141000 Reported November 7, 1984 1,300 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The door latches may be defective because a pawl spring was not manufactured to specifications. The pawl spring does not create proper tension on the pawl, (a part of the door latch mechanism). This constitutes a non-compliance with the requirements of federal motor vehicle safety standard no. 206, "door latches and door retention…

    Remedy: The dealer will inspect and replace door latches, if necessary.

    Model years: 1984

16. Leaf spring assembly (suspension)

    NHTSA 84V142000 Reported November 7, 1984 2,198 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The spring center bolt is not the proper size or length. As a result, location and alignment of the spring to the front axle may not be correct. If the front spring clips loosen, the inadequate center bolt may result in spring to axle misalignment, shifting of the axle, and loss of steering control.

    Remedy: The defect will be corrected by the addition of a spacer between the spring and the center bolt head to increase the effective head length. A longer center bolt will also be installed for positive retention.

    Model years: 1984

17. Check valve (service brakes)

    NHTSA 84V035000 Reported March 23, 1984 850 vehicles potentially affected MACK TRUCKS, INCORPORATED

    A manufacturing error resulted in the installation of carbon steel springs in some dual-compartment air reservoir check valves. Carbon steel springs are inadequate for this application because they are subject to severe corrosion and subsequent failure of the check valve.

    Remedy: The carbon steel spring will be replaced with a stainless steel one.

    Model years: 1982, 1983

18. Steering wheel/handle bar (steering)

    NHTSA 84V033000 Reported March 22, 1984 4,393 vehicles potentially affected MACK TRUCKS, INCORPORATED

    Improper steering clamp bolts and torque applied during installation. The bolt could fail, allowing the steering yoke to become loose.

    Remedy: Inspection and, if necessary, installation of proper steering shaft clamp bolts tightened to specifications.

    Model years: 1983, 1984

19. Steering wheel/handle bar (steering)

    NHTSA 83V100000 Reported September 27, 1983 507 vehicles potentially affected MACK TRUCKS, INCORPORATED

    Under severe strain, a defective weld joining the steering wheel hub to the hub perimeter could fail, causing the steering wheel to separate from the vehicle.

    Remedy: Defective steering wheels will be replaced at no charge to owner.

    Model years: 1982, 1983

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Source: NHTSA recall and complaint databases and EPA fuel economy data, October 2026. Complaint counts are owner reports to NHTSA, not verified defects. Recall counts are safety campaigns that list this model year; whether a particular car was already repaired depends on its VIN. How this data is compiled.