1977 MACK HMM Recalls (4)
- 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:
- 77V174000 on 10/11/1979
- Component:
- Seat belts:front:anchorage
- Affected:
- 6,591
- Defect:
- The involved vehicles do not conform to federal motor vehicle safety standard no. 209, "seatbelt assemblies". although the seatbelts in question performed marginally with respect to the 5000 lb. load requirement, additional testing confirmed that the anchor could fail, allowing either the anchor to slip over the hold-down nut or the anchor to separate into two pieces.
- Correction:
- Dealer will inspect and, if necessary, replace seat belt assemblies without charge to owner.
- Notes:
- Vehicle description: trucks.system: interior; seat belt anchorage assembly.consequences of defect: in the event of an accident, these seat belts may notadequately restrain passengers and serious injuries may result.
- Campaign:
- 77V205000 on 10/11/1979
- Component:
- Suspension:rear:springs:leaf spring assembly:hanger/bracket
- Manufactured:
- 04/30/1977 - 09/30/1977
- Affected:
- 7,400
- Defect:
- A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. this is due to improper positioning of the weld, in relationship to the bracket and axle housing. failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the affected axle.
- Correction:
- Dealer will reweld the insulator spring bracket at no cost to owner.
- Notes:
- Vehicle description: heavy trucks.system: suspension; tandem axle.consequences of defect: this condition could cause a loss of vehicle controland a vehicle accident.
- Campaign:
- 77V204000 on 10/11/1979
- Component:
- Seat belts:front:anchorage
- Affected:
- 11
- Defect:
- The involved vehicles do not conform to federal motor vehicle safety standard nos. 207, "seating systems", and 210, "seat belt assembly anchorages". vehicles equipped with viking t-bar seats have the seat belt anchorage located under the seat. the tether belt ruptured when subjected to the forces required in the safety test.
- Correction:
- Dealer will relocate the tether belt floor anchorage to correct the problem, without charge to owner.
- Notes:
- Vehicle description: heavy trucks equipped with viking t-bar seats.system: interior; seat & shoulder belt anchorage.consequences of defect: in the event of a vehicle accident, the seat belt maynot provide adequate restraint to the wearer and serious personal injury couldresult.
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