1976 MACK DM Recalls (5)
- Campaign:
- 79V134000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Manufactured:
- 05/31/1974 - 02/28/1978
- Affected:
- 64,150
- Defect:
- In the involved trucks it is possible the adjustable steering column rear mounting bracket could fail, allowing steering wheel assembly to fall down onto the operator"s lap.
- Correction:
- Dealer will install an additional bracket in this area to prevent the steering wheel from dislocating in the event of a bracket failure.
- Notes:
- Vehicle 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.
- Campaign:
- 78V068000 on 10/11/1979
- Component:
- Service brakes, air:antilock:control unit/module
- Manufactured:
- 09/30/1974 - 02/29/1976
- Affected:
- 9,700
- Defect:
- 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.
- Correction:
- The dealer will inspect and, if necessary, replace the anti-wheel lock controller without charge to owner.
- Notes:
- Vehicle 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.
- Campaign:
- 78V032000 on 10/11/1979
- Component:
- Engine and engine cooling:engine:gasoline
- Manufactured:
- 06/30/1976 - 11/30/1977
- Affected:
- 459
- Defect:
- The synflex-type oil pressure signal line may have been routed too close to the exhaust manifold. excessive heat may cause the line to rupture, and oil leakage may occur.
- Correction:
- The dealer will reroute the oil pressure signal line to eliminate potential fire hazard, without charge to owner.
- Notes:
- Vehicle description: trucks equipped with v-8 engines.system: engine; oil pressure signal line.consequences of defect: if oil is sprayed onto the hot exhaust manifold, avehicle fire and personal injury to occupants could result.
- Campaign:
- 78V172000 on 10/11/1979
- Component:
- Steering:linkages:knuckle:spindle:arm
- Affected:
- 13,800
- Defect:
- The 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.
- Correction:
- The dealer will inspect and, if necessary, install cross steering arms of improved design and greater strength.
- Notes:
- Vehicle description: truck tractors.system: steering; steering arm.consequences of defect: loss of steering control could lead to loss of vehiclecontrol and an accident.
- Campaign:
- 77V173000 on 10/11/1979
- Component:
- Engine and engine cooling:cooling system:fan
- Affected:
- 48,000
- Defect:
- 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.
- Correction:
- Dealer will replace the original fan with a steel fixed blade fan, free of charge.
- Notes:
- Vehicle 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.
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