- The problem
- 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.
- The fix
- The dealer will inspect and, if necessary, install cross steering arms of improved design and greater strength.
Vehicle safety record
1975 Mack DMM Problems, complaints & recalls
No owner complaints about the 1975 Mack DMM have been filed with NHTSA. It is covered by 4 recalls, the latest in August 1978 for the arm.
NHTSA data checked
FFar more problems than a typical DMM year, for its age
- Complaints
- 0
- Recalls
- 4
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1975 Mack DMM recalls 4
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
- The problem
- An axle "no brake" condition could result from an eaton controller internal electrical malfunction. This condition may cause the anti-wheel lock valve solenoid to be continuously energized and prevent the brakes from being applied on one of the axles. As a result, the anti-wheel lock warning lamp is not activated.
- The fix
- The dealer will inspect and, if necessary, replace the anti-wheel lock controller without charge to owner.
- The problem
- 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.
- The fix
- Dealer will replace the original fan with a steel fixed blade fan, free of charge.
What owners say
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No complaints about the 1975 Mack DMM yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
Mack DMM: every year compared
All DMM years1975 Mack DMM vs rivals
| Vehicle | Complaints | Recalls | Grade | |
|---|---|---|---|---|
| 1975 Mack DMM | 0 | 4 | F | |
| 1975 Mack Mack | 1 | 1 | C | Compare |
More sales usually means more complaints, so compare similar vehicles of the same year. The grade compares each vehicle with its own model's other years.
Questions about the 1975 Mack DMM
Does the 1975 Mack DMM have any recalls?
Yes - NHTSA lists 4 recalls for the 1975 Mack DMM: arm (August 1978); control unit / module (April 1978); fan (October 1977); hoses, lines / piping, and fittings (October 1975). Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 1975 Mack DMM had?
None have been filed with NHTSA so far.
Is the 1975 Mack DMM a reliable vehicle?
Its Safety Index is 11 out of 100 (grade F: far more problems than a typical Mack DMM year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 1975 Mack DMM has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data