Mack HMM recalls by model year
Explore the records behind recurring owner reports.
Key facts
0 owner complaints analyzed
6 distinct recall campaigns
Not available median reported failure mileage
Scope: 1972 to 1977 model years. Data snapshot: . 0 complaints include usable failure mileage.
Recalls by model year
All campaigns in the snapshot affecting each model year, including recalls announced years later.
Recall campaigns
Shared campaigns appear once in each affected model year.
| Category | Count |
|---|---|
| 1972 | 1 |
| 1973 | 1 |
| 1974 | 2 |
| 1975 | 2 |
| 1976 | 4 |
| 1977 | 4 |
1972: 1; 1973: 1; 1974: 2; 1975: 2; 1976: 4; 1977: 4
Year-by-year records
Recall history
6 distinct campaigns affect this selection. Announcement dates below are different from vehicle model years. A campaign may cover multiple years.
77V173000 · Engine And Engine Cooling:Cooling System:Fan
Reported: 1977-10-12 (October 12, 1977) · Model years: 1972, 1973, 1974, 1975, 1976, 1977
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.
NHTSA campaign record ↗78V068000 · Service Brakes, Air:Antilock:Control Unit/Module
Reported: 1978-04-04 (April 4, 1978) · Model years: 1974, 1975, 1976
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.
Remedy: THE DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE ANTI-WHEEL LOCK CONTROLLER WITHOUT CHARGE TO OWNER.
NHTSA campaign record ↗76V118000 · Power Train:Driveline:Universal Joint
Reported: 1976-07-28 (July 28, 1976) · Model years: 1976
NHTSA campaign record ↗77V204000 · Seat Belts:Front:Anchorage
Reported: 1977-11-21 (November 21, 1977) · Model years: 1976, 1977
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. THE TETHER BELT RUPTURED WHEN SUBJECTED TO THE FORCES REQUIRED IN THE SAFETY TEST.
Remedy: DEALER WILL RELOCATE THE TETHER BELT FLOOR ANCHORAGE TO CORRECT THE PROBLEM, WITHOUT CHARGE TO OWNER.
NHTSA campaign record ↗77V174000 · Seat Belts:Front:Anchorage
Reported: 1977-10-12 (October 12, 1977) · Model years: 1977
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: DEALER WILL INSPECT AND, IF NECESSARY, REPLACE SEAT BELT ASSEMBLIES WITHOUT CHARGE TO OWNER.
NHTSA campaign record ↗77V205000 · Suspension:Rear:Springs:Leaf Spring Assembly:Hanger/Bracket
Reported: 1977-11-21 (November 21, 1977) · Model years: 1977
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: DEALER WILL REWELD THE INSULATOR SPRING BRACKET AT NO COST TO OWNER.
NHTSA campaign record ↗