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Steering: hydraulic power assist systemRecall 91V-080 · 1988–1989 Mack CF

MACK TRUCKS, INCORPORATED recall 91V-080 covers 35 1988–1989 Mack CF for a steering: hydraulic power assist system problem, reported to NHTSA on May 23, 1991.

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Vehicles repairedNo manufacturer report yet
Vehicles affected351 model
ReportedMay 23, 1991Owners notified May 2, 1991
Complaints since0Same system, after the recall

Source: NHTSA recall 91V080000 and manufacturer quarterly reports. Started by an NHTSA defect investigation.

What's wrong

The problem

INCORRECT MANUFACTURE OF THE HYDROBOOST CYLINDER ALLOWS THE BALL SOCKET CLAMP TO CONTACT RIGHT SIDE STEERING LEVER ON AN EXTREME LEFT TURN AND CAUSE FLEXING OF THE CYLINDER ROD.

The risk

THIS FLEXING CAN CAUSE SEAL FAILURE OR CYLINDER FAILUREOF THE HYDROBOOST UNIT AND RESULT IN LOSS OF STEERING CONTROL AND RESULT IN AVEHICLE ACCIDENT.

What to do

The fix

REPLACE INCORRECTLY BUILT BOOST CYLINDERS.

SYSTEM: STEERING POWER ASSIST, HYDROBOOST ASSEMBLY.VEHICLE DESCRIPTION: CF AERIALSCOPE MODEL.

Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.

1 model

Vehicles in this recall

Mack CF1988, 1989

Built from March 1, 1988 to June 1, 1989. Not every vehicle in these model years is included; check by VIN.

Background

The investigation behind this recall

  1. POWER STEERING FAILUREEA91009 · closed May 28, 1991
    NHTSA