1977 Mack DM: recalls and complaints

No tracked figure of this page changed in a data update. What the log tracks

All updates to the register

• 79V13300031 May 1979Engine and Engine Cooling / Engine
• 79V13400030 May 1979Steering / Steering Wheel/Handle Bar
• 79V0820003 Apr 1979Steering / Steering Wheel/Handle Bar
• 79V01700012 Jan 1979Suspension / Multiple Axle
• 78V2100003 Oct 1978Service Brakes, Air / Antilock / Interconnecting Assembly(Wiring)
• 78V1720008 Aug 1978Steering / Linkages / Knuckle / Spindle / Arm
• 78V0320009 Feb 1978Engine and Engine Cooling / Engine / Gasoline
• 77V20500021 Nov 1977Suspension / Rear / Springs / Leaf Spring Assembly / Hanger/Bracket
• 77V17300012 Oct 1977Engine and Engine Cooling / Cooling System / Fan
• 77V17400012 Oct 1977Seat Belts / Front / Anchorage
• 77V09600017 Jun 1977Wheels

1. 79V133000Received 31 May 1979. 23,000 units.

   Engine and Engine Cooling / Engine

   Defect, in the NHTSA record

   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 bearing housing, engine lubricating oil may be allowed to escape under pressure, contacting the engine exhaust manifold sections or turbocharger turbine housing.

   Remedy, in the NHTSA record

   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.

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 2 Nov 1979.

2. 79V134000Received 30 May 1979. 64,150 units.

   Steering / Steering Wheel/Handle Bar

   Defect, in the NHTSA record

   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, in the NHTSA record

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

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 10 Nov 1979.

3. 79V082000Received 3 Apr 1979. 12,000 units.

   Steering / Steering Wheel/Handle Bar

   Defect, in the NHTSA record

   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, in the NHTSA record

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

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 13 Aug 1979.

4. 79V017000Received 12 Jan 1979. 4,000 units.

   Suspension / Multiple Axle

   Defect, in the NHTSA record

   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, in the NHTSA record

   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.

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 13 Aug 1979.

5. 78V210000Received 3 Oct 1978. 19,370 units.

   Service Brakes, Air / Antilock / Interconnecting Assembly(Wiring)

   Defect, in the NHTSA record

   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 brake systems".

   Remedy, in the NHTSA record

   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.

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 7 Nov 1978.

6. 78V172000Received 8 Aug 1978. 13,800 units.

   Steering / Linkages / Knuckle / Spindle / Arm

   Defect, in the NHTSA record

   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, in the NHTSA record

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

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 22 Feb 1979.

7. 78V032000Received 9 Feb 1978. 459 units.

   Engine and Engine Cooling / Engine / Gasoline

   Defect, in the NHTSA record

   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, in the NHTSA record

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

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 26 Oct 1978.

8. 77V205000Received 21 Nov 1977. 7,400 units.

   Suspension / Rear / Springs / Leaf Spring Assembly / Hanger/Bracket

   Defect, in the NHTSA record

   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 affected axle.

   Remedy, in the NHTSA record

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

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 14 Mar 1978.

9. 77V173000Received 12 Oct 1977. 48,000 units.

   Engine and Engine Cooling / Cooling System / Fan

   Defect, in the NHTSA record

   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, in the NHTSA record

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

   Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 23 Mar 1978.

10. 77V174000Received 12 Oct 1977. 6,591 units.

    Seat Belts / Front / Anchorage

    Defect, in the NHTSA record

    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 anchor to separate into two pieces.

    Remedy, in the NHTSA record

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

    Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 23 Aug 1978.

11. 77V096000Received 17 Jun 1977. 825 units.

    Wheels

    Defect, in the NHTSA record

    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, in the NHTSA record

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

    Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 9 Sep 1977.

The campaign number opens the NHTSA record. Each quotation is the text of the NHTSA recall file.

Recall campaign: One recall in the NHTSA recall file, with one campaign number. A campaign can name many makes, models and model years.

Units: The number of vehicles or products that a recall can include. The manufacturer or the firm reports the number to the agency.

The NHTSA complaint file has no complaint for this model year.

The NHTSA investigation file has no investigation that names this model year.

Investigation: A study of a possible safety defect by the NHTSA Office of Defects Investigation. An investigation with no closing date in the NHTSA file is open.

1. 19651
2. 19661
3. 19672
4. 19682
5. 19693
6. 19704
7. 19716
8. 19724
9. 19734
10. 19747
11. 19756
12. 19765
13. 197711
14. 19786
15. 19791
16. 19871
17. 19881
18. 19892
19. 19901
20. 19911
21. 19922
22. 19931
23. 19982
24. 19992
25. 20003
26. 20012
27. 20021
28. 20032
29. 20044
30. 20051
31. 20061

A year without a link has fewer than 2 campaigns and fewer than 25 complaints. It has no page.

• Mack DM: all model years
• Mack: 90 model lines

Follow by RSS:Mack recallsVehicle recalls

• NHTSA VIN lookupNHTSA shows the unrepaired recalls of one vehicle from its VIN or its license plate.
• NHTSA: report a safety problemThe NHTSA form for a complaint about a vehicle, a tire, a child seat or equipment.
• NHTSA page of the 1977 Mack DMThe recalls, the complaints and the investigations that NHTSA shows for this model year.

How many units are in the recall campaigns for the 1977 Mack DM?

199,595 units in 11 campaigns. A campaign can name other models and model years, and its units include them.

How many recall campaigns does the Mack DM have for all model years?

NHTSA lists 37 recall campaigns for the Mack DM, model years 1965 to 2006. 11 of them name the 1977 model year.

Is an NHTSA investigation of the 1977 Mack DM open?

The NHTSA investigation file has no investigation that names this model year.