1976 MACK RL Recalls (5)
- Campaign:
- 79V134000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Manufactured:
- 05/31/1974 - 02/28/1978
- Affected:
- 64,150
- Defect:
- In the involved trucks it is possible the adjustable steering column rear mounting bracket could fail, allowing steering wheel assembly to fall down onto the operator"s lap.
- Correction:
- Dealer will install an additional bracket in this area to prevent the steering wheel from dislocating in the event of a bracket failure.
- Notes:
- Vehicle description: trucks.system: steering assembly; steering wheel and column.consequences of defect: while steering would remain functional in thiscondition, the element of surprise to operator could cause loss of vehiclecontrol 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:
- 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.
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