1972 MACK RD Recalls (3)

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.

Campaign:
73V102000 on 10/11/1979
Component:
Service brakes, air
Manufactured:
12/31/1970 - 02/28/1973
Affected:
2,481
Notes:
Equipped with anchorlok spring brake chambers.manf'd jan.1971 thru march1973.trucks.possibility that the clamp ringbolts on the anchorlok springbrake chamber were incorrectly positioned at time of installation.in thisposition the end of the bolt may contact rear axle housing during brakeactuation.due to bracket deflection, the clamp ring or bolt may failpermitting the spring brake section to separate from the service chamber.(correct by inspecting and repositioning clamp and bolts).

Campaign:
73V153000 on 10/11/1979
Component:
Communications:horn assembly
Manufactured:
01/31/1971 - 05/31/1973
Affected:
1,285
Notes:
Mack trucks campaign no n/a.manuf'd feb.1971 thru june 1973.trucks.possibility that the electric horn mounting bracket could crack and fail.ifthis condition exists the horn could interfere with steering shaft universaljoint and cause steering lockup in a left hand turn situation.(correct byinspecting and replacing horn assembly with improved type bracket).

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