Recalls for 1986 Mack Mack

DEFECT #1 - SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY

Posted on: 1990-02-06
Description
The 7/8 inch spring eye bolts within the spring eye bushing hanger bracket of the rear suspension may fail.

Consequence
The spring could fall onto the road surface, without warning to the driver, and a vehicle crash could occur due to the sudden drag of the spring.

Corrective Action
Replace all 7/8 inch diameter spring eye bolts with 1 inch diameter bolts.

Notes
System: suspension; spring eye bolt.vehicle description: heavy duty trucks with st34 or st 38 rear suspension.

DEFECT #2 - SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY:U-BOLT, LEAF SPRING TO AXLE

Posted on: 1989-02-27
Description
An incorrect 3/4 inch bolt was installed on rt/rs 450 suspension.

Consequence
This bolt may break, causing disengagement of the beam connection of rear suspension, resulting in loss of control, which could result in an accident.

Corrective Action
Retrofit chassis with 1 inch bolts.

Notes
System: suspension.vehicle description: heavy duty trucks built with hendrickson rt/rs 450suspension.

DEFECT #3 - SUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM

Posted on: 1987-02-13
Description
Crossmember can be overstressed and can fail, allowing the broken crossmember to protude above the top of the frame and interfere with chassis components.

Consequence
Trailer handling could be affected during turningmaneuvers which could result in loss of truck control and a crash.  Also, acompletely separated crossmember could affect height of suspension air springsand the resulting lean could result in loss of control.

Corrective Action
Installation of a bolted double plate type crossmember to replace the standard channel type crossmember.

Notes
System: rear crossmember with neway air suspension.vehicle description: heavy duty trucks:dm,f,fm,mc,mce,mh,mr,r,rd,rs,rl,rw,rwl,rws and u models equipped with neway airride drive axle suspension.

DEFECT #4 - SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS

Posted on: 1988-08-08
Description
Some air brake hose assemblies may not comply with burst strength requirements of fmvss 106.

Consequence
Vehicles do not comply with standard.

Corrective Action
Replace suspect hose assemblies.

Notes
System: air brake hose assembly/fmvss 106.vehicle description: heavy duty trucks.

DEFECT #5 - POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT

Posted on: 1986-01-21
Description
Incorrect inner wheel bearings were installed in the rear axles which wears a groove in the spindle due to a poor fit.  Consequence of defect: a deep groove could cause the axle housing to break and result in a vehicle crash without prior warning.

Consequence


Corrective Action
Replace inner wheel bearing with correct bearing.  Also, if a groove is present, remove the groove and assure that no cracks are present.  Replace housing if cracked.

Notes
System: rear axle inner bearing.vehicle description: heavy duty trucks equipped with mack ss440c or sw440c rear axle.