Mack Mc Series 1979

Model Mc Series made in 1979 by Mack got 4 recalls. There were some recalls concerningparking brake, service brakes, air and structure.

Model 1979

Recalls


CampaignManufacturerManufacturing dateType# of units affectedDate Owner notified MfgRecall Initiated byManufacturers of recalled vehicles/productsReport Recieved DateRecord Creation DateRegulation Part NumberFMVSS Number
PARKING BRAKE - DRIVELINE - AIR
80V052000MACK TRUCKS, INCORPORATEDfrom 07/01/1979 to 01/01/1980V (Vehicle)966610/20/1980MFRMACK TRUCKS, INC05/06/198007/18/1980
Defect SummaryOn certain vehicles, the knob that operates the tractor park valve may break off, rendering the valve inoperable.
Consequence Summary
Corrective SummaryDefective knobs will be replaced with an improved type, without charge to owner.
NotesVehicle 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.
SERVICE BRAKES, AIR - CONTROLS - HAND CONTROL
81V088000MACK TRUCKS, INCORPORATEDfrom 07/01/1979 to 01/01/1980V (Vehicle)1000012/21/1981MFRMACK TRUCKS, INC07/08/198107/14/1981
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryThe holes will be retooled to provide correct alignment and plastic knobs will be replaced by knobs of stronger material having metal reinforcements.
NotesVehicle 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.
STRUCTURE - BODY
81V083000MACK TRUCKS, INCORPORATEDfrom 03/01/1978 to 05/01/1981V (Vehicle)18002/26/1982MFRMACK TRUCKS, INC07/07/198107/14/1981
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryThe front canopy cab mounting bracket will be modified to allow for clearance of the right hand front brake chamber, without charge to owner.
NotesVehicle 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.
SUSPENSION - REAR - SPRINGS - LEAF SPRING ASSEMBLY
84V036000MACK TRUCKS, INCORPORATEDfrom 10/01/1978 to 05/01/1982V (Vehicle)3421ODIMACK TRUCKS, INC03/23/198404/11/1984
Defect SummarySpring 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.
Consequence Summary
Corrective SummaryThe axle housing will be inspected and replaced, if necessary. the spring seats will also be replaced.
NotesVehicle description: heavy trucks.system: suspension; rear spring seat.consequences of defect: loss of vehicle control could occur without warning,possibly resulting in an accident.