Recalls for your 1974 Mack Hmm

Recalls for 1974 Mack Hmm

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2 recalls found.
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DEFECT #1 - SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE


Posted on: 1979-10-12
Description
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.

Consequence


Corrective Action
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.

DEFECT #2 - ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN


Posted on: 1979-10-12
Description
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.

Consequence


Corrective Action
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.