OFFICIAL NHTSA RECALL

78V171000

Steering:linkages:knuckle:spindle:arm

Reported Aug 8, 1978 · MACK TRUCKS, INCORPORATED

Summary

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.

Consequence

Not supplied in the source record.

Remedy

DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE LEFT STEERING KNUCKLE WITH AN IMPROVED TYPE OF KNUCKLE.

Notes

VEHICLE DESCRIPTION: TRUCK TRACTORS.SYSTEM: STEERING; STEERING KNUCKLE.CONSEQUENCES OF DEFECT: LOSS OF STEERING CONTROL COULD CAUSE A VEHICLEACCIDENT.

This campaign page uses the representative official campaign record. Applicability-specific source variants appear on the linked vehicle pages. Recall counts refer to campaigns, not affected vehicles.

Vehicle entries in this campaign

1974 Mack Mb 1974 Mack U 1974 Mack R 1974 Mack F 1973 Mack U 1973 Mack R 1973 Mack Mb 1973 Mack F 1972 Mack F 1972 Mack U 1972 Mack R 1972 Mack Mb 1971 Mack U 1971 Mack Mb 1971 Mack F 1971 Mack R

This is model-level recall history. It does not confirm whether a particular VIN is affected or has received the repair. Check with NHTSA ↗