1975 MACK WS Recalls (13)

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:
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:
76V005000 on 10/11/1979
Component:
Visibility:windshield wiper/washer:motor
Affected:
790
Notes:
Mack campaign no sc070.possibility that a distortion of the air-operatedwindshield wiper motor housing can allow excessive internal leakage.thiscondition could result in sluggish windshield wiper operation and possiblyfailure to operate when activated.(correct by inspecting and replacing withnew wiper motor and control valve).
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:
76V006000 on 10/11/1979
Component:
Service brakes, air:antilock:wheel speed sensor
Affected:
350
Notes:
Mack campaign no sc072.trucks equipped with eaton skid control system androckwell international ff931 or fl931 w front axles with aluminum wheel hubs.possibility that full adjustment of the wheel speed sensor cannot be obtainedwith the present eaton wheel speed rotor.if this results in interferencebetween the rotor and sensor on only one wheel of the front axle and theinterferenceis sufficient to damage the sensor, then anti-wheel lock capabilitywill be lost on the front axle and the anti-wheel lock warning light indicatorwill activate, alerting the driver.however, in the event sensor-to-rotorinterference on both wheels of the front axle, and causes damage to bothsensor, the anti-wheel lock capability will be lost on the front axle, but theanti-wheel lock indicator warning light will not be activated.absence of theanti-lock capability could result in impaired vehicle control should the driverundertake a panic stop in slippery road conditions.(correct by inspecting andreplacing eaton wheel rotors with improved parts and replace damaged sensos).
Campaign:
75V139000 on 10/11/1979
Component:
Service brakes, air:supply:hoses, lines/piping, and fittings
Affected:
110
Notes:
Mack campaign no sco-61.trucks.possibility that the reinforcement insertspecified in connector used with synflex hose may have been omitted.thiscondition could result in inadequate retention of the hose to the connector andcould allow hose to disconnect during brake application, causing loss ofbraking on the affected wheel.(correct by inspecting and installing properassembly 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).
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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