TM 9-2320-280-20-1
1-29. STEERING CONTROL SYSTEM OPERATION
The steering system is identical for all models covered in this manual. Major components of the steering
system are:
HYDRAULIC CONTROL VALVE - Directs hydraulic fluid to provide required pressure to actuate
and deactuate fan clutch as required by engine temperature. Hydraulic pressure supplied by power
steering pump.
HYDRO-BOOST - Converts hydraulic power from the steering pump to mechanical power to the
master cylinder, providing power assist during braking.
ACCESSORY DRIVE PULLEY BELTS - Transmits mechanical driving power from crankshaft
drive pulley to steering pump pulley which drives the steering pump.
POWER STEERING COOLER - Directs power steering fluid through a series of fins or baffles so
outside air can dissipate excess heat before the fluid is recirculated through the steering system.
OIL RESERVOIR AND STEERING PUMP - Combined in one unit, the reservoir serves as an oil
filling point and the pump supplies the oil under pressure throughout the steering system.
FAN CLUTCH - Hydraulically-actuated by pressure from hydraulic control valve to control
operation of fan. Hydraulic pressure supplied by power steering pump.
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