1978 MACK RWS Recalls (6)
- Campaign:
- 79V130000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Manufactured:
- 10/31/1977 - 03/31/1979
- Affected:
- 2,187
- Defect:
- It has been determined that two screws that are part of the bearing assembly located at the cab dash sheet may not have been tightened properly. as a result, the upper steering shaft may be free to "float" throughout much of its length which may result in inadequate engagement in the slip splines of the lower steering shaft. axle articulation could result in disengagement of the lower steering shaft slip splines.
- Correction:
- Dealer will install a sleeve between the dash sheet bearing and the upper steering shaft lower yoke to assure positive upper steering shaft location.
- Notes:
- Vehicle description: trucks.system: steering assembly; steering column shaft, upper.consequences of defect: loss of steering control could cause loss of vehiclecontrol and an accident.
- Campaign:
- 79V133000 on 10/11/1979
- Component:
- Engine and engine cooling:engine
- Manufactured:
- 01/31/1977 - 02/28/1979
- Affected:
- 23,000
- Defect:
- In the event of turbocharger compressor wheel failure, one or more of the four capscrews that hold the turbocharger together may be struck by parts of the compressor wheel, resulting in the capscrews being damaged. if these capscrews are damaged to the point that they allow the compressor back plate to dislocate from the turbocharger bearing housing, engine lubricating oil may be allowed to escape under pressure, contacting the engine exhaust manifold sections or turbocharger turbine housing.
- Correction:
- Dealer will install a shield for the heads of the four capscrews, along with stronger sae 8 grade 8 capscrews, if necessary, at no cost to owner.
- Notes:
- Vehicle description: trucks equipped with endt (b) 676, etaz (b) 673a, and etay(b) 673a engines.system: engine and engine cooling.consequences of defect: engine lubricating oil, in the presence of a source ofignition, could lead to an engine compartment fire and serious injury tovehicle passengers.
- Campaign:
- 79V137000 on 10/11/1979
- Component:
- Steering:linkages
- Manufactured:
- 04/30/1977 - 03/31/1979
- Affected:
- 6,673
- Defect:
- The pitman arm retaining nut may not have been torqued to manufacturer specifications. this could result in inadequate retention of the nut at the output shaft, allowing the pitman arm to become loose.
- Correction:
- Dealer will inspect and retorque pitman arm, if necessary, at no cost to owner.
- Notes:
- Vehicle description: trucks.system: steering linkages; arm, pitman.consequences of defect: this condition could lead to premature wearing of theoutput shaft causing loss of vehicle control and an accident.
- Campaign:
- 78V210000 on 10/11/1979
- Component:
- Service brakes, air:antilock:interconnecting assembly(wiring)
- Manufactured:
- 09/30/1977 - 08/31/1978
- Affected:
- 19,370
- Defect:
- Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. this constitutes a non-compliance to federal motor vehicle safety standard no. 121, "air brake systems".
- Correction:
- Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.
- Notes:
- Vehicle description: heavy trucks.system: service brakes; electrical wiring and connectors.consequences of defect: this delay in effective braking action could lead to anaccident under certain traffic conditions.
- 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:
- 78V222000 on 10/11/1979
- Component:
- Electrical system:wiring
- Manufactured:
- 06/30/1977 - 08/31/1978
- Affected:
- 161
- Defect:
- A short circuit could occur due to chafing or wire disconnection in the box.
- Correction:
- The wiring in the sleeper box will be corrected, free of charge.
- Notes:
- Vehicle description: heavy truck tractors equipped with the able body company"ssleeper box.consequences of defect: a short circuit creates a potential fire hazard whichcould jeopardize the safety of vehicle occupants.
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