Mack Ws 1976

Model Ws made in 1976 by Mack got 8 recalls. There were some recalls concerningengine and engine cooling, service brakes, air and steering.

Model 1976

Recalls


CampaignManufacturerManufacturing dateType# of units affectedDate Owner notified MfgRecall Initiated byManufacturers of recalled vehicles/productsReport Recieved DateRecord Creation DateRegulation Part NumberFMVSS Number
ENGINE AND ENGINE COOLING - COOLING SYSTEM - FAN
77V173000MACK TRUCKS, INCORPORATED V (Vehicle)4800003/23/1978ODIMACK TRUCKS, INC10/12/197710/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryDealer will replace the original fan with a steel fixed blade fan, free of charge.
NotesVehicle 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.
ENGINE AND ENGINE COOLING - ENGINE
78V170000MACK TRUCKS, INCORPORATED V (Vehicle)85012/04/1978MFRMACK TRUCKS, INC08/08/197810/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryDealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.
NotesVehicle description: trucks.system: engine; engine mounting bracket.consequences of defect: loss of throttle control may result in loss of vehiclecontrol and an accident.
SERVICE BRAKES, AIR - ANTILOCK - CONTROL UNIT/MODULE
78V068000MACK TRUCKS, INCORPORATEDfrom 10/01/1974 to 03/01/1976V (Vehicle)970009/01/1978ODIMACK TRUCKS, INC04/04/197810/12/1979
Defect SummaryAn 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.
Consequence Summary
Corrective SummaryThe dealer will inspect and, if necessary, replace the anti-wheel lock controller without charge to owner.
NotesVehicle 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.
SERVICE BRAKES, AIR - DRUM
77V013000MACK TRUCKS, INCORPORATEDfrom 01/01/1975 to 12/01/1975V (Vehicle)830MFRMACK TRUCKS, INC01/01/197708/29/1983
Defect SummaryCracks 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.
Consequence Summary
Corrective SummaryThe dealer will inspect and modify the affected brake spiders, free of charge.
NotesVehicle 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.
SERVICE BRAKES, AIR - SUPPLY - HOSES, LINES/PIPING, AND FITTINGS
78V030000MACK TRUCKS, INCORPORATEDfrom 12/01/1975 to 01/01/1978V (Vehicle)40008/23/1978MFRMACK TRUCKS, INC02/09/197810/12/1979
Defect SummaryA 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.
Consequence Summary
Corrective SummaryThe dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.
NotesVehicle 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.
STEERING - GEAR BOX (OTHER THAN RACK AND PINION)
77V011000MACK TRUCKS, INCORPORATED V (Vehicle)220003/29/1977MFRMACK TRUCKS, INC01/01/197710/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryThe dealer will secure the clamp bolt and make the necessary modifications on the lower steering shaft, free of charge.
NotesVehicle 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.
STEERING - WHEEL AND HANDLE BAR
76V060000MACK TRUCKS, INCORPORATED V (Vehicle)60810/27/1976MFRMACK TRUCKS, INC04/20/197610/12/1979
Defect Summary
Consequence Summary
Corrective Summary
NotesMack 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).
WHEELS - MULTI PIECE
77V149000MACK TRUCKS, INCORPORATED V (Vehicle)25001/17/1978MFRMACK TRUCKS, INC09/19/197710/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryDealer will install steel hubs in place of aluminum hubs without charge to owner.
NotesVehicle 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.