1977 Mack Dmm Recalls, Complaints & Specs
5 safety recalls list the 1977 Mack Dmm. Check your own VIN below.
5 safety recalls for the 1977 Mack Dmm
Most recent first. Recall repairs are free at any authorised dealer. Click a recall for the full defect, consequence and remedy text.
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Engine (engine and engine cooling)
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.
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Interconnecting assembly(wiring) (service brakes)
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.
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Arm (steering)
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.
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Fan (engine and engine cooling)
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.
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Anchorage (seat belts)
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.
No owner complaints on file
NHTSA has no owner complaints on file for the 1977 Mack Dmm. 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 Dmm model years
Recall and complaint counts for every Mack Dmm model year in NHTSA's database.
| Model year | Recalls | Complaints |
|---|---|---|
| 1972 Mack Dmm | 1 | 0 |
| 1973 Mack Dmm | 1 | 0 |
| 1974 Mack Dmm | 4 | 0 |
| 1975 Mack Dmm | 4 | 0 |
| 1976 Mack Dmm | 4 | 0 |
| 1977 Mack Dmm | 5 | 0 |
| 1978 Mack Dmm | 3 | 0 |
| 1979 Mack Dmm | 1 | 0 |
| 1980 Mack Dmm | 1 | 0 |
| 1981 Mack Dmm | 1 | 0 |
| 1982 Mack Dmm | 1 | 0 |
| 1983 Mack Dmm | 1 | 0 |
| 1984 Mack Dmm | 1 | 0 |
| 1985 Mack Dmm | 1 | 0 |
| 1986 Mack Dmm | 1 | 0 |
| 1987 Mack Dmm | 2 | 0 |
| 1988 Mack Dmm | 2 | 0 |
| 1989 Mack Dmm | 2 | 0 |
| 1990 Mack Dmm | 1 | 0 |
| 1991 Mack Dmm | 1 | 0 |
| 1992 Mack Dmm | 1 | 0 |
| 2000 Mack Dmm | 1 | 0 |
| 2001 Mack Dmm | 2 | 0 |
| 2003 Mack Dmm | 1 | 0 |
Checking a specific 1977 Mack Dmm
How do I know if my 1977 Mack Dmm has an open recall?
Enter your 17-character VIN above. The VIN is on the driver's side dashboard (visible through the windshield), the driver's door jamb sticker, and your registration or insurance card. The check runs against NHTSA's live database and tells you which campaigns list your vehicle. 5 campaigns currently list the 1977 Mack Dmm; your car may already have been repaired under some of them.
Is the recall repair free?
Yes. Under federal law, manufacturers must fix safety recalls at no charge for vehicles up to 15 years old from the date of sale to the first owner. Contact any authorised Mack dealer with your VIN and the NHTSA campaign number (for example 77V173000).
What is the difference between a recall and a complaint?
A recall is a safety campaign filed by the manufacturer or ordered by NHTSA, with a defined defect and remedy. A complaint is a report an owner sent to NHTSA; it is not verified, but patterns of complaints are what trigger NHTSA investigations and, eventually, recalls.
Other Mack models
- Mack28 complaints
- Anthem (an)12 complaints
- Granite (gr)9 complaints
- CXU6127 complaints
- Ch6 complaints
- Gu6 complaints
- CH6005 complaints
- Cxu5 complaints
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.