1976 MACK WL Recalls (8)
- Campaign:
- 77V011000 on 10/11/1979
- Component:
- Steering:gear box (other than rack and pinion)
- Affected:
- 2,200
- Defect:
- The lower steering shaft yoke clamp bolts on the involved vehicles may not have been sufficiently tightened. should these bolts lossen and come off, the lower steering shaft could separate from the steering gear.
- Correction:
- The dealer will secure the clamp bolt and make the necessary modifications on the lower steering shaft, free of charge.
- Notes:
- Vehicle description: heavy trucks.system: steering; steering shaft, lower.consequences of defect: separation of the lower steering control shaft loweryoke may result in loss of steering control 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:
- 77V149000 on 10/11/1979
- Component:
- Wheels:multi piece
- Affected:
- 250
- Defect:
- The front wheel aluminum hubs on the involved vehicles may be subject to cracks which may progress circumferentially around the barrel of the hub. this could lead to a fracture in the "barrel" position of the hub and complete hub failure.
- Correction:
- Dealer will install steel hubs in place of aluminum hubs without charge to owner.
- Notes:
- Vehicle description: trucks equipped with ff-931 front axles.system: wheels; aluminum hubs, front.consequences of defect: hub failure could result in loss of vehicle control andan accident.note: hub failure may be indicated by an audible sound at the instant of hubseparation, along with thumping or wheel wobble. hub may separate from thewheel and still be retained on the axle.
- Campaign:
- 78V030000 on 10/11/1979
- Component:
- Service brakes, air:supply:hoses, lines/piping, and fittings
- Manufactured:
- 11/30/1975 - 12/31/1977
- Affected:
- 400
- Defect:
- A design deficiency exists in the air dryer piping in the area of the pressure relief valve and compressor governor control link. moisture is passed and builds up in this relief valve and control line. in freezing ambient temperatures, this moisture may freeze, allowing the chassis air system pressure to exceed 150 psi. excessive air system pressure can cause separation of air piping connections and air system valve failure.
- Correction:
- The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.
- Notes:
- Vehicle description: trucks equipped with anchorlok air dryers.system: service brakes; air system and governor control line (air dryer).consequences of defect: when this occurs, automatic application of the chassisemergency spring brakes and trailer brakes could cause loss of vehicle controlwithout prior warning and a vehicle accident.note: owner/driver is advised not to operate vehicle if air pressure exceeds15o psi.
- Campaign:
- 78V170000 on 10/11/1979
- Component:
- Engine and engine cooling:engine
- Affected:
- 850
- Defect:
- The possibility exists that the aluminum engine rear support brackets may fail due to metal fatigue. this type of failure would allow the engine and transmission assembly to dislocate downward. this will result in throttle control loss with the engine operating continuously in the mid to upper range of the governed speed range.
- Correction:
- Dealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.
- Notes:
- Vehicle description: trucks.system: engine; engine mounting bracket.consequences of defect: loss of throttle control may result in 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.
- Campaign:
- 76V060000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Affected:
- 608
- Notes:
- Mack campaign no sc075.trucks.possibility that a faulty weld in attachingthe tubular upper section of the steering shaft to the solid lower section.failure of this weld allows internal separation of the steering shaft withresultant complete loss of steering control.this could result in loss ofvehicle control without warning to the driver.(correct by inspecting andreplacing upper steering shaft with improved material).
- Campaign:
- 77V013000 on 08/28/1983
- Component:
- Service brakes, air:drum
- Manufactured:
- 12/31/1974 - 11/30/1975
- Affected:
- 830
- Defect:
- Cracks may be present in the brake spider. these cracks could eventually cause the brake spider to fail. this could allow separation of that portion of the brake spider that retains the brake camshaft, the brake chamber, and the brake chamber bracket from the foundation brake assembly. brake pull in the direction opposite the affected wheel location or wheel lock-up on the affected wheel could occur.
- Correction:
- The dealer will inspect and modify the affected brake spiders, free of charge.
- Notes:
- Vehicle description: trucks.system: service brakes; front axle cam, brake spider.consequences of defect: brake degradation and wheel lock-up could cause loss ofvehicle control and an accident.
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