1979 MACK MC SERIES Recalls (4)
- Campaign:
- 80V052000 on 07/17/1980
- Component:
- Parking brake:driveline:air
- Manufactured:
- 06/30/1979 - 12/31/1979
- Affected:
- 9,666
- Defect:
- On certain vehicles, the knob that operates the tractor park valve may break off, rendering the valve inoperable.
- Correction:
- Defective knobs will be replaced with an improved type, without charge to owner.
- Notes:
- Vehicle description: trucks.system: service brakes; tractor park valve control knob.consequences of defect: the purpose of the tractor park valve is to allow thedriver to apply the tractor spring emergency/parking brake independently of thetrailer emergency parking brakes. if the knob is broken, the tractor parkingbrakes cannot be applied. if parked on an incline and left unattended, vehiclecould roll free and cause accident and injury.
- Campaign:
- 81V088000 on 07/13/1981
- Component:
- Service brakes, air:controls:hand control
- Manufactured:
- 06/30/1979 - 12/31/1979
- Affected:
- 10,000
- Defect:
- The retaining pin for the brake control knob has been misaligned (off the center line of the valve plunger hole). this causes the knob to be overstressed at the retaining pin hole area causing it to separate from the valve.
- Correction:
- The holes will be retooled to provide correct alignment and plastic knobs will be replaced by knobs of stronger material having metal reinforcements.
- Notes:
- Vehicle description: trucks equipped with brake control knobs.system: service brakes; knob retaining pin.consequences of defect: with the knob broken off, the control valve wouldbecome difficult or impossible to operate. one or a combination of brakeapplications would not be possible and the vehicle could be parked in an unsafecondition. an accident and personal injury could result.
- Campaign:
- 81V083000 on 07/13/1981
- Component:
- Structure:body
- Manufactured:
- 02/28/1978 - 04/30/1981
- Affected:
- 180
- Defect:
- The right hand front canopy cab mounting bracket interferes with the right hand brake chamber on the steering axle when in a certain degree turn and severe bumping is present.
- Correction:
- The front canopy cab mounting bracket will be modified to allow for clearance of the right hand front brake chamber, without charge to owner.
- Notes:
- Vehicle description: trucks.system: structure; front canopy cab mounting bracket.consequences of defect: if this interference should occur it may result indegraded braking ability without prior warning with the potential for a vehicleaccident.
- Campaign:
- 84V036000 on 04/10/1984
- Component:
- Suspension:rear:springs:leaf spring assembly
- Manufactured:
- 09/30/1978 - 04/30/1982
- Affected:
- 3,421
- Defect:
- Spring seat can deform, which causes a decrease in the clamping force in the suspension assembly. loss of clamping force may bring about axle misalignment or axle housing failure.
- Correction:
- The axle housing will be inspected and replaced, if necessary. the spring seats will also be replaced.
- Notes:
- Vehicle description: heavy trucks.system: suspension; rear spring seat.consequences of defect: loss of vehicle control could occur without warning,possibly resulting in an accident.
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