TM-9-2320-387-10
TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113
OPERATOR’S MANUAL
OCTOBER 2001
CHANGE 1
TM-9-2320-387-10 - Page 41 of 277
TM
9-2320-387-10
l-24.
STEERING CONTROL SYSTEM OPERATION
Major components of the steering system are:
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A
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B
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C
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D
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E
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F
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-BOOSTER
- Converts hydraulic power from the steering pump to
mechanical power to the master cylinder, providing power assist during
braking.
SERPENTINE
BELT - 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 bafnes 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 is supplied by the power
steering pump.
1-27
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