There have been 6 safety recalls for the Mack HMM. The most recent recalls are shown below. Table 1 and Table 2 show the historical recalls and the recall statistics by the model year of the Mack HMM.
| Recalled Vehicles: 1974 Mack DM, 1975 Mack DM, 1976 Mack DM, 1974 Mack DMM, 1975 Mack DMM, 1976 Mack DMM, 1974 Mack F, 1975 Mack F, 1976 Mack F, 1974 Mack HMM, 1975 Mack HMM, 1976 Mack HMM, 1974 Mack MB, 1975 Mack MB, 1976 Mack MB, 1974 Mack R, 1975 Mack R, 1976 Mack R, 1974 Mack RD, 1975 Mack RD, 1976 Mack RD, 1974 Mack RL, 1975 Mack RL, 1976 Mack RL, 1974 Mack RM, 1975 Mack RM, 1976 Mack RM, 1974 Mack RS, 1975 Mack RS, 1976 Mack RS, 1974 Mack U, 1975 Mack U, 1976 Mack U, 1974 Mack WL, 1975 Mack WL, 1976 Mack WL, 1974 Mack WS, 1975 Mack WS, 1976 Mack WS |
| Component: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE |
| Recall Summary: 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.... Details of this recall 🔎 |
| Recalled Vehicles: 1977 Mack DM, 1977 Mack F, 1977 Mack HMM, 1977 Mack MB, 1977 Mack R, 1977 Mack RD, 1977 Mack RL, 1977 Mack RM, 1977 Mack RS, 1977 Mack U, 1977 Mack WL, 1977 Mack WS |
| Component: SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY:HANGER/BRACKET |
| Recall Summary: 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, ... Details of this recall 🔎 |
| Recalled Vehicles: 1976 Mack HMM, 1977 Mack HMM |
| Component: SEAT BELTS:FRONT:ANCHORAGE |
| Recall Summary: The involved vehicles do not conform to federal motor vehicle safety standard nos. 207, "seating systems", and 210, "seat belt assembly anchorages". Vehicles equipped with viking t-bar seats have the seat belt anchorage located under the seat.... Details of this recall 🔎 |
| Recalled Vehicles: 1977 Mack CF, 1977 Mack DM, 1977 Mack DMM, 1977 Mack F, 1977 Mack HMM, 1977 Mack R, 1977 Mack RD, 1977 Mack RM, 1977 Mack U |
| Component: SEAT BELTS:FRONT:ANCHORAGE |
| Recall Summary: 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 ... Details of this recall 🔎 |
| Recalled Vehicles: 1972 Mack CF, 1973 Mack CF, 1974 Mack CF, 1975 Mack CF, 1976 Mack CF, 1977 Mack CF, 1972 Mack DM, 1973 Mack DM, 1974 Mack DM, 1975 Mack DM, 1976 Mack DM, 1977 Mack DM, 1972 Mack DMM, 1973 Mack DMM, 1974 Mack DMM, 1975 Mack DMM, 1976 Mack DMM, 1977 Mack DMM, 1972 Mack F, 1973 Mack F, 1974 Mack F, 1975 Mack F, 1976 Mack F, 1977 Mack F, 1972 Mack FL, 1973 Mack FL, 1974 Mack FL, 1975 Mack FL, 1976 Mack FL, 1977 Mack FL, 1972 Mack FS, 1973 Mack FS, 1974 Mack FS, 1975 Mack FS, 1976 Mack FS, 1977 Mack FS, 1972 Mack HMM, 1973 Mack HMM, 1974 Mack HMM, 1975 Mack HMM, 1976 Mack HMM, 1977 Mack HMM, 1972 Mack R, 1973 Mack R, 1974 Mack R, 1975 Mack R, 1976 Mack R, 1977 Mack R, 1972 Mack RD, 1973 Mack RD, 1974 Mack RD, 1975 Mack RD, 1976 Mack RD, 1977 Mack RD, 1972 Mack RL, 1973 Mack RL, 1974 Mack RL, 1975 Mack RL, 1976 Mack RL, 1977 Mack RL, 1972 Mack RM, 1973 Mack RM, 1974 Mack RM, 1975 Mack RM, 1976 Mack RM, 1977 Mack RM, 1972 Mack U, 1973 Mack U, 1974 Mack U, 1975 Mack U, 1976 Mack U, 1977 Mack U, 1972 Mack WL, 1973 Mack WL, 1974 Mack WL, 1975 Mack WL, 1976 Mack WL, 1977 Mack WL, 1972 Mack WS, 1973 Mack WS, 1974 Mack WS, 1975 Mack WS, 1976 Mack WS, 1977 Mack WS |
| Component: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN |
| Recall Summary: 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. ... Details of this recall 🔎 |
| Date | Component | Vehicle Affected |
|---|---|---|
| Apr. 4, 1978 | Service Brakes, Air:antilock:control Unit/module | 9,700 |
| Nov. 21, 1977 | Suspension:rear:springs:leaf Spring Assembly:hanger/bracket | 7,400 |
| Nov. 21, 1977 | Seat Belts:front:anchorage | 11 |
| Oct. 12, 1977 | Engine And Engine Cooling:cooling System:fan | 48,000 |
| Oct. 12, 1977 | Seat Belts:front:anchorage | 6,591 |
| Jul. 28, 1976 | Power Train:driveline:universal Joint | 105 |
| Model | # Recalls |
|---|---|
| 1977 Mack HMM | 4 |
| 1976 Mack HMM | 4 |
| 1975 Mack HMM | 2 |
| 1974 Mack HMM | 2 |
| 1973 Mack HMM | 1 |
| 1972 Mack HMM | 1 |