There have been 22 safety recalls for the Mack U. 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 U.
In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.
| Recalled Vehicles: 1987 Mack CF, 1988 Mack CF, 1989 Mack CF, 1990 Mack CF, 1991 Mack CF, 1992 Mack CF, 1987 Mack CH, 1988 Mack CH, 1989 Mack CH, 1990 Mack CH, 1991 Mack CH, 1992 Mack CH, 1987 Mack CHR, 1988 Mack CHR, 1989 Mack CHR, 1990 Mack CHR, 1991 Mack CHR, 1992 Mack CHR, 1987 Mack CL, 1988 Mack CL, 1989 Mack CL, 1990 Mack CL, 1991 Mack CL, 1992 Mack CL, 1987 Mack DM, 1988 Mack DM, 1989 Mack DM, 1990 Mack DM, 1991 Mack DM, 1992 Mack DM, 1987 Mack DMM, 1988 Mack DMM, 1989 Mack DMM, 1990 Mack DMM, 1991 Mack DMM, 1992 Mack DMM, 1987 Mack FDM, 1988 Mack FDM, 1989 Mack FDM, 1990 Mack FDM, 1991 Mack FDM, 1992 Mack FDM, 1987 Mack MC, 1988 Mack MC, 1989 Mack MC, 1990 Mack MC, 1991 Mack MC, 1992 Mack MC, 1987 Mack MH, 1988 Mack MH, 1989 Mack MH, 1990 Mack MH, 1991 Mack MH, 1992 Mack MH, 1987 Mack MHR, 1988 Mack MHR, 1989 Mack MHR, 1990 Mack MHR, 1991 Mack MHR, 1992 Mack MHR, 1987 Mack MR, 1988 Mack MR, 1989 Mack MR, 1990 Mack MR, 1991 Mack MR, 1992 Mack MR, 1987 Mack R, 1988 Mack R, 1989 Mack R, 1990 Mack R, 1991 Mack R, 1992 Mack R, 1987 Mack RB, 1988 Mack RB, 1989 Mack RB, 1990 Mack RB, 1991 Mack RB, 1992 Mack RB, 1987 Mack RD, 1988 Mack RD, 1989 Mack RD, 1990 Mack RD, 1991 Mack RD, 1992 Mack RD, 1987 Mack RM, 1988 Mack RM, 1989 Mack RM, 1990 Mack RM, 1991 Mack RM, 1992 Mack RM, 1987 Mack RW, 1988 Mack RW, 1989 Mack RW, 1990 Mack RW, 1991 Mack RW, 1992 Mack RW, 1987 Mack U, 1988 Mack U, 1989 Mack U, 1990 Mack U, 1991 Mack U, 1992 Mack U |
| Component: VEHICLE SPEED CONTROL |
| Recall Summary: Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism. ... Details of this recall 🔎 |
Wiper failure during vehicle operation could reduce driver's ability to see the road, and creates a potential for an accident.
| Recalled Vehicles: 1989 Mack DM, 1989 Mack DMM, 1989 Mack R, 1989 Mack RB, 1989 Mack RD, 1989 Mack RM, 1989 Mack RW, 1989 Mack U |
| Component: VISIBILITY:WINDSHIELD WIPER/WASHER:LINKAGES |
| Recall Summary: A tolerance mismatch in the crank assembly of the bosch windshield wiper motor could cause instantaneous separation of the crank from the linkage assembly in the left hand control arm assembly; this would make the system inoperable. ... Details of this recall 🔎 |
| Recalled Vehicles: 1977 Mack DM, 1978 Mack DM, 1979 Mack DM, 1977 Mack DMM, 1978 Mack DMM, 1979 Mack DMM, 1977 Mack F, 1978 Mack F, 1979 Mack F, 1977 Mack MC, 1978 Mack MC, 1979 Mack MC, 1977 Mack MR, 1978 Mack MR, 1979 Mack MR, 1977 Mack R, 1978 Mack R, 1979 Mack R, 1977 Mack RD, 1978 Mack RD, 1979 Mack RD, 1977 Mack RL, 1978 Mack RL, 1979 Mack RL, 1977 Mack RM, 1978 Mack RM, 1979 Mack RM, 1977 Mack RS, 1978 Mack RS, 1979 Mack RS, 1978 Mack RWL, 1979 Mack RWL, 1977 Mack RWS, 1978 Mack RWS, 1979 Mack RWS, 1977 Mack U, 1978 Mack U, 1979 Mack U, 1977 Mack WL, 1978 Mack WL, 1979 Mack WL, 1977 Mack WS, 1978 Mack WS, 1979 Mack WS |
| Component: ENGINE AND ENGINE COOLING:ENGINE |
| Recall Summary: 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.... Details of this recall 🔎 |
| Recalled Vehicles: 1977 Mack DM, 1978 Mack DM, 1977 Mack R, 1978 Mack R, 1977 Mack RD, 1978 Mack RD, 1977 Mack U, 1978 Mack U |
| Component: STEERING:WHEEL AND HANDLE BAR |
| Recall Summary: An improper pinch bolt and nut may have been used in the clamping of the steering shaft to the steering gear input shaft. Due to clamping force loads applied at the bolt, the nut could yield, resulting in looseness of the input shaft yoke.... Details of this recall 🔎 |
| Recalled Vehicles: 1977 Mack DM, 1978 Mack DM, 1977 Mack R, 1978 Mack R, 1977 Mack RD, 1978 Mack RD, 1977 Mack U, 1978 Mack U |
| Component: SUSPENSION:MULTIPLE AXLE |
| Recall Summary: A casting deficiency exists in the lower section of the caps resulting in a reduction in the thickness of the material. Failure of a cap can allow the end of the rear spring to detach from the axle housing. ... Details of this recall 🔎 |
| Date | Component | Vehicle Affected |
|---|---|---|
| Feb. 15, 1994 | Vehicle Speed Control | 39,777 |
| Mar. 16, 1990 | Visibility:windshield Wiper/washer:linkages | 2,350 |
| May. 31, 1979 | Engine And Engine Cooling:engine | 23,000 |
| Apr. 3, 1979 | Steering:wheel And Handle Bar | 12,000 |
| Jan. 12, 1979 | Suspension:multiple Axle | 4,000 |
| Oct. 3, 1978 | Service Brakes, Air:antilock:interconnecting Assembly(wiring) | 19,370 |
| Aug. 8, 1978 | Steering:linkages:knuckle:spindle:arm | 2,100 |
| Apr. 4, 1978 | Service Brakes, Air:antilock:control Unit/module | 9,700 |
| Feb. 9, 1978 | Suspension:multiple Axle | 33,000 |
| Nov. 21, 1977 | Suspension:rear:springs:leaf Spring Assembly:hanger/bracket | 7,400 |
| Oct. 12, 1977 | Engine And Engine Cooling:cooling System:fan | 48,000 |
| Oct. 12, 1977 | Seat Belts:front:anchorage | 6,591 |
| Jan. 13, 1976 | Suspension:rear:springs:leaf Spring Assembly:leaf | 54 |
| Oct. 31, 1975 | Service Brakes, Air:antilock:interconnecting Assembly(wiring) | 3,400 |
| Oct. 31, 1975 | Service Brakes, Air:supply:hoses, Lines/piping, And Fittings | 1,200 |
| Jun. 23, 1975 | Suspension:multiple Axle | 414 |
| Dec. 2, 1974 | Suspension | 1,119 |
| Nov. 21, 1974 | Exterior Lighting:headlights:switch | 1,023 |
| Feb. 25, 1974 | Power Train:axle Assembly:banjo Housing | 9,019 |
| May. 22, 1972 | Fuel System, Gasoline:fuel Injection System | 1,410 |
| Feb. 14, 1972 | Steering:linkages | 538 |
| Aug. 13, 1969 | Visibility:defroster/defogger System:windshield:controls/wiring | 87 |
| Model | # Recalls |
|---|---|
| 1992 Mack U | 1 |
| 1991 Mack U | 1 |
| 1990 Mack U | 1 |
| 1989 Mack U | 2 |
| 1988 Mack U | 1 |
| 1987 Mack U | 1 |
| 1979 Mack U | 1 |
| 1978 Mack U | 5 |
| 1977 Mack U | 8 |
| 1976 Mack U | 3 |
| 1975 Mack U | 6 |
| 1974 Mack U | 6 |
| 1973 Mack U | 5 |
| 1972 Mack U | 4 |
| 1971 Mack U | 5 |
| 1970 Mack U | 3 |
| 1969 Mack U | 2 |
| 1968 Mack U | 1 |
| 1967 Mack U | 1 |