MACK UNSPECIFIED 1973: SUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM

General Information

NHTSA Campaign ID Number: 87V010000

Make Model Year
MACK UNSPECIFIED 1973
Date Owners Notified Date Received by ODI Date Added to Database
1987-02-09 1987-02-09 1987-02-13

Production Dates: 1971-11-01 - 1987-02-01

Manufacturers Involved: Mack Trucks, Inc.

Component: SUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM

Potential Number Of Units Affected: 5235

Report Initiator: ODI ODI Report

Summary

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.

Remedy

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.