MACK U 1972: STEERING:LINKAGES:KNUCKLE:SPINDLE:ARM
NHTSA Campaign ID Number: 78V171000
| Make | Model | Year |
|---|---|---|
| MACK | U | 1972 |
| Date Owners Notified | Date Received by ODI | Date Added to Database |
| 1979-08-10 | 1978-08-08 | 1979-10-12 |
Manufacturers Involved: Mack Trucks, Inc.
Component: STEERING:LINKAGES:KNUCKLE:SPINDLE:ARM
Potential Number Of Units Affected: 2100
Report Initiator: MFR MFR Report
DEFICIENCIES, IN THE FORM OF FORGING LAPS, CRACKS AND EXCESSIVE DECARBURIZATION DURING HEAT TREATMENT, EXIST IN THE STEERING KNUCKLES. STRESSES IMPOSED WITH INTEGRAL HYDRAULIC POWER STEERING MAY LEAD TO A FAILURE IN THE AREA OF THE STEERING ARM ATTACHING BOSS. THIS TYPE OF FAILURE WOULD CAUSE LOSS OF STEERING CONTROL.
DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE LEFT STEERING KNUCKLE WITH AN IMPROVED TYPE OF KNUCKLE.
VEHICLE DESCRIPTION: TRUCK TRACTORS.SYSTEM: STEERING; STEERING KNUCKLE.CONSEQUENCES OF DEFECT: LOSS OF STEERING CONTROL COULD CAUSE A VEHICLEACCIDENT.
