Mack Dm 1975

Model Dm made in 1975 by Mack got 6 recalls. There were some recalls concerningengine and engine cooling, service brakes, air and steering.

Model 1975

Recalls


CampaignManufacturerManufacturing dateType# of units affectedDate Owner notified MfgRecall Initiated byManufacturers of recalled vehicles/productsReport Recieved DateRecord Creation DateRegulation Part NumberFMVSS Number
ENGINE AND ENGINE COOLING - COOLING SYSTEM - FAN
77V173000MACK TRUCKS, INCORPORATED V (Vehicle)4800003/23/1978ODIMACK TRUCKS, INC10/12/197710/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryDealer will replace the original fan with a steel fixed blade fan, free of charge.
NotesVehicle description: trucks equipped with six-cylinder engines.system: engine cooling; fan.consequences of defect: broken pieces can be propelled outside of the fanshroud and will present an immediate danger and possible injury to personsstanding nearby.note: prior to correction, vehicle should not be serviced with the hood raisedand the engine running.
SERVICE BRAKES, AIR - ANTILOCK - CONTROL UNIT/MODULE
78V068000MACK TRUCKS, INCORPORATEDfrom 10/01/1974 to 03/01/1976V (Vehicle)970009/01/1978ODIMACK TRUCKS, INC04/04/197810/12/1979
Defect SummaryAn 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.
Consequence Summary
Corrective SummaryThe dealer will inspect and, if necessary, replace the anti-wheel lock controller without charge to owner.
NotesVehicle description: trucks equipped with eaton 21 anti-lock controllers.system: service brakes; anti-wheel lock solenoid.consequences of defect: loss of brakes on any one axle will result in extendedvehicle stopping distances, which could lead to a vehicle accident.
SERVICE BRAKES, AIR - ANTILOCK - INTERCONNECTING ASSEMBLY(WIRING)
75V190000MACK TRUCKS, INCORPORATED V (Vehicle)340002/23/1976MFRMACK TRUCKS, INC10/31/197510/12/1979
Defect Summary
Consequence Summary
Corrective Summary
NotesMack campaign no q1010.trucks sept.1974 thru july 17, 1975.possibilitythat the power and warning light lead from the anti-wheel lock controller forthe steering axle may have been inadvertently connected incorrectly to a wheelsensor cable.if this occurs,the controller on the steering axle would not bepowered nor would the anti-wheel lock warning light indicate thenon-functioning condition to the driver.the absence of anti-wheel lockcapability on the steering axle, along with the absence of anti-wheel lockwarning light indication, could result in impaired vehicle control, should thedriver undertake a panic stop in slippery road conditions.(correct byinspecting and properly connect wiring to anti-wheel lock controller).
SERVICE BRAKES, AIR - SUPPLY - HOSES, LINES/PIPING, AND FITTINGS
75V192000MACK TRUCKS, INCORPORATED V (Vehicle)120002/20/1976MFRMACK TRUCKS, INC10/31/197510/12/1979
Defect Summary
Consequence Summary
Corrective Summary
NotesMack campaign no n/a.trucks with dual brake treadle valve piping sept.1974and mar.31, 1975.possibility that the primary and secondary air supplylines may have been connected in reverse at the dual brake treadle valve.thereversing of these supply lines does not in itself, affect vehicle braking ifboth the primary and secondary air supply systems have normal operating airpressure.however, in the event of loss of air pressure in either the primaryor secondary system, neither the primary nor secondary service brakes wouldfunction when applied.in this event, it would require manual application ofthe emergency spring brake to stop vehicle.(correct by inspecting andrerouting air supply piping as required to correct system).
STEERING - LINKAGES - KNUCKLE - SPINDLE - ARM
78V172000MACK TRUCKS, INCORPORATED V (Vehicle)1380002/22/1979MFRMACK TRUCKS, INC08/08/197810/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryThe dealer will inspect and, if necessary, install cross steering arms of improved design and greater strength.
NotesVehicle description: truck tractors.system: steering; steering arm.consequences of defect: loss of steering control could lead to loss of vehiclecontrol and an accident.
STEERING - WHEEL AND HANDLE BAR
79V134000MACK TRUCKS, INCORPORATEDfrom 06/01/1974 to 03/01/1978V (Vehicle)6415011/10/1979MFRMACK TRUCKS, INC05/30/197910/12/1979
Defect SummaryIn the involved trucks it is possible the adjustable steering column rear mounting bracket could fail, allowing steering wheel assembly to fall down onto the operators lap.
Consequence Summary
Corrective SummaryDealer will install an additional bracket in this area to prevent the steering wheel from dislocating in the event of a bracket failure.
NotesVehicle description: trucks.system: steering assembly; steering wheel and column.consequences of defect: while steering would remain functional in thiscondition, the element of surprise to operator could cause loss of vehiclecontrol and an accident.