1980 MACK F SERIES Recalls (2)

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.

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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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