1977 Mack Dm Recalls, Complaints & Specs

11 safety recalls list the 1977 Mack Dm. Check your own VIN below.

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11 safety recalls for the 1977 Mack Dm

Most recent first. Recall repairs are free at any authorised dealer. Click a recall for the full defect, consequence and remedy text.

1. Engine (engine and engine cooling)

   NHTSA 79V133000 Reported May 31, 1979 23,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

   In the event of turbocharger compressor wheel failure, one or more of the four capscrews that hold the turbocharger together may be struck by parts of the compressor wheel, resulting in the capscrews being damaged. If these capscrews are damaged to the point that they allow the compressor back plate to dislocate from the turbocharger…

   Remedy: Dealer will install a shield for the heads of the four capscrews, along with stronger sae 8 grade 8 capscrews, if necessary, at no cost to owner.

2. Steering wheel/handle bar (steering)

   NHTSA 79V134000 Reported May 30, 1979 64,150 vehicles potentially affected MACK TRUCKS, INCORPORATED

   In the involved trucks it is possible the adjustable steering column rear mounting bracket could fail, allowing steering wheel assembly to fall down onto the operator"s lap.

   Remedy: Dealer will install an additional bracket in this area to prevent the steering wheel from dislocating in the event of a bracket failure.

3. Steering wheel/handle bar (steering)

   NHTSA 79V082000 Reported April 3, 1979 12,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

   An improper pinch bolt and nut may have been used in the clamping of the steering shaft to the steering gear input shaft. Due to clamping force loads applied at the bolt, the nut could yield, resulting in looseness of the input shaft yoke. Should this condition go unnoticed, spline wear could cause shaft separation.

   Remedy: Vehicles will be inspected and, if necessary, the correct fasteners will be installed at no charge to owner.

4. Multiple axle (suspension)

   NHTSA 79V017000 Reported January 12, 1979 4,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

   A casting deficiency exists in the lower section of the caps resulting in a reduction in the thickness of the material. Failure of a cap can allow the end of the rear spring to detach from the axle housing.

   Remedy: Dealer will inspect and, if necessary, replace any of the spring insulator caps found to be defective. This will be done at no cost to owner.

5. Interconnecting assembly(wiring) (service brakes)

   NHTSA 78V210000 Reported October 3, 1978 19,370 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. This constitutes a non-compliance to federal motor vehicle safety standard no. 121, "air…

   Remedy: Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.

6. Arm (steering)

   NHTSA 78V172000 Reported August 8, 1978 13,800 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The existing cross steering arms may have insufficient fatigue life in the neck area. This is near the boss for the cross steering tube ball joint connection. Failure of either of the cross steering levers could lead to loss of steering control of the right front wheel.

   Remedy: The dealer will inspect and, if necessary, install cross steering arms of improved design and greater strength.

7. Gasoline (engine and engine cooling)

   NHTSA 78V032000 Reported February 9, 1978 459 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The synflex-type oil pressure signal line may have been routed too close to the exhaust manifold. Excessive heat may cause the line to rupture, and oil leakage may occur.

   Remedy: The dealer will reroute the oil pressure signal line to eliminate potential fire hazard, without charge to owner.

8. Hanger/bracket (suspension)

   NHTSA 77V205000 Reported November 21, 1977 7,400 vehicles potentially affected MACK TRUCKS, INCORPORATED

   A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. This is due to improper positioning of the weld, in relationship to the bracket and axle housing. Failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the…

   Remedy: Dealer will reweld the insulator spring bracket at no cost to owner.

9. Fan (engine and engine cooling)

   NHTSA 77V173000 Reported October 12, 1977 48,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The flex blade fans on the involved vehicles may develop cracks in the laminated stiffener as a result of fatigue during operation. If such a condition exists and the cracks go undetected, continued operation could cause pieces of the stiffener to break off.

   Remedy: Dealer will replace the original fan with a steel fixed blade fan, free of charge.

10. Anchorage (seat belts)

    NHTSA 77V174000 Reported October 12, 1977 6,591 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The involved vehicles do not conform to federal motor vehicle safety standard no. 209, "seatbelt assemblies". Although the seatbelts in question performed marginally with respect to the 5000 lb. Load requirement, additional testing confirmed that the anchor could fail, allowing either the anchor to slip over the hold-down nut or the…

    Remedy: Dealer will inspect and, if necessary, replace seat belt assemblies without charge to owner.

11. Wheels

    NHTSA 77V096000 Reported June 17, 1977 825 vehicles potentially affected MACK TRUCKS, INCORPORATED

    The front wheel rim clamp studs, installed on the involved vehicles, may not have been manufactured correctly, causing a brittle condition in the thread root area. The studs could eventually crack and break when wheel nuts are tightened to specifications.

    Remedy: The dealer will replace all suspect front wheel studs, without charge to owner.

No owner complaints on file

NHTSA has no owner complaints on file for the 1977 Mack Dm. For context, the average model year in NHTSA's database has dozens; a zero can mean a reliable vehicle, a rare one, or both.

Compare Mack Dm model years

Recall and complaint counts for every Mack Dm model year in NHTSA's database.

Checking a specific 1977 Mack Dm

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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.