TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 82 of 888
TM 9-2320-280-20-1
Change 2
1-49
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:
B
HYDRO-BOOST
–
Converts hydraulic power from the steering pump to mechanical power to the
master cylinder, providing power assist during braking.
A
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.
D
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.
C
ACCESSORY DRIVE PULLEY BELTS
– Transmits mechanical driving power from crankshaft
drive pulley to steering pump pulley which drives the steering pump.
E
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.
F
FAN CLUTCH
– Hydraulically actuated and deactuated by the hydraulic control valve. The fan is
actuated when hydraulic pressure is released, and deactuated when hydraulic pressure is applied.
Hydraulic pressure is supplied by the power steering pump.
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