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NHTSA Campaign 78V171000

STEERING:LINKAGES:KNUCKLE:SPINDLE:ARM

Issued by MACK TRUCKS, INCORPORATED · Reported Aug 8, 1978 · 2,100 vehicles affected

What's wrong

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.

Remedy

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

Vehicles affected by this recall

Make Model Year Units
MACK F 1971 2,100
MACK F 1972 2,100
MACK F 1973 2,100
MACK F 1974 2,100
MACK MB 1971 2,100
MACK MB 1972 2,100
MACK MB 1973 2,100
MACK MB 1974 2,100
MACK R 1971 2,100
MACK R 1972 2,100
MACK R 1973 2,100
MACK R 1974 2,100
MACK U 1971 2,100
MACK U 1972 2,100
MACK U 1973 2,100
MACK U 1974 2,100

Source: NHTSA Campaign 78V171000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.