Mack HMM6856S Recalls & Complaints by Model Year
NHTSA lists 1 safety recall and 0 owner complaints across 5 model years of the Mack HMM6856S (1973–1977).
Pick your Mack HMM6856S model year
- 1973
- 1974
- 1975
- 1976
- 1977
| Model year | Recalls | Complaints |
|---|---|---|
| 1977 Mack HMM6856S | 1 | 0 |
| 1976 Mack HMM6856S | 1 | 0 |
| 1975 Mack HMM6856S | 1 | 0 |
| 1974 Mack HMM6856S | 1 | 0 |
| 1973 Mack HMM6856S | 1 | 0 |
All Mack HMM6856S recalls (1)
Every NHTSA safety campaign that lists a Mack HMM6856S, most recent first, with the model years each one covers.
-
Linkages (steering)
The steering pitman arm is subject to failure at the area of the transition to the arm offset due to high stress concentrations.
Remedy: Dealer will replace the steering pitman arm, steering gear output shaft and steering gear mounting bracket.
Model years: 1973, 1974, 1975, 1976, 1977
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.