1974 MACK WL Recalls (7)
- 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:
- 76V083000 on 10/11/1979
- Component:
- Service brakes, air:drum:chamber
- Affected:
- 404
- Notes:
- Mack campaign no q1014.truck-tractor equipped with fa536c and fa537c seriesfront axles.possibility that the front axle mounted brake chamber may contactthe cab tilt cylinder, under extreme axle articulation.if this conditionexists, it may result in an inoperative front brake causing loss of brakeing onthe affected wheel, and could adversely affect steering stability during brakeapplication.(correct by inspecting and providing additional clearance betweenthe affeced parts).
- 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:
- 75V060000 on 10/11/1979
- Component:
- Service brakes, air:drum:drum
- Affected:
- 600
- Notes:
- Mack campaign no n/a.trucks mfg'd april 1, 1974 thru nov.15, 1974.possibility that on models with outboard-mounted brake drums and steel discwheel on aluminum wheel hubs, the manufacturing tolerances may cause aninterference problem between the inside portion of wheel and outer edge of castdrum.this condition results in overstress of wheel studs.the failure ofwheel studs could cause separation of disc wheel from chassis and could causeloss of vehicle control.(correct by inspecting and adjusting to precludeinterference where necessary).
- Campaign:
- 75V140000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Affected:
- 402
- Notes:
- Mack campaign no sco-62.trucks mfg'd dec.13, 1974 thru june 25, 1975.possibility the clamp around the steering column may have been incorrectlypositioned on the steering column, which could result in steering shaft splineengagement being less than specified.if this condition exists it could resultin steering shaft spline disengagement with loss of steering control.(correctby inspecting and adjusting steering column clamp where necessary).
- Campaign:
- 75V141000 on 10/11/1979
- Component:
- Service brakes, air:supply:check valve
- Affected:
- 935
- Notes:
- Mack campaign no sco-63.trucks mfg'd dec.12, 1974 thru june 30, 1975.possibility that the trailer supply control valve exhaust port was inadvertenlyplugged, and the safety valve on the air reservoir may have been omitted.ifthis condition exists it could lead to intermittent lockup of the trailerbrakes and difficulty in charging the trailer brake air system.(correct byinspecting and installing valve and unplug control valve).
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