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NHTSA Campaign 94V143000

STEERING:HYDRAULIC POWER ASSIST SYSTEM

Issued by THOMAS BUILT BUSES, INC. · Reported Aug 1, 1994 · 1,150 vehicles affected

What's wrong

A SUDDEN HYDRAULIC PRESSURE LOSS DURING HARD TURNS RESULTS IN A MOMENTARY LOSS OF POWER STEERING ASSIST. THE PRESSURE LOSS OCCURS WHEN THE HYDRAULICALLY DRIVEN ENGINE COOLING FAN TURNS OFF IN THE TURN.

Consequence

THE DRIVER REACTS TO THE LOSS OF POWER STEERING ASSIST BY OVERSTEERING, WHICH COULD RESULT IN A VEHICLE ACCIDENT.

Remedy

THE HYDRAULIC CONTROL VALVES WILL BE REPLACED WITH VALVES OF A NEW DESIGN. UNTIL SUCH TIME AS PARTS ARE AVAILABLE, OWNERS WILL BE INSTRUCTED TO DISCONNECT THE FAN CUTOFF SWITCH SO THAT HYDRAULICALLY DRIVEN FANS WILL RUN FULL TIME, ELIMINATING THE PRESSURE SPIKE.

Vehicles affected by this recall

Make Model Year Units
THOMAS SAF-T-LINER 1992 1,150
THOMAS SAF-T-LINER 1993 1,150
THOMAS SAF-T-LINER 1994 1,150
THOMAS TRANSIT LINER 1992 1,150
THOMAS TRANSIT LINER 1993 1,150
THOMAS TRANSIT LINER 1994 1,150

Source: NHTSA Campaign 94V143000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.