1974 MACK HMM Recalls (2)

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:

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.

Home | Privacy