TM 5-3805-290-23-1
THEORY OF OPERATION - CONTINUED
0003 00
HYDRAULIC SYSTEM - CONTINUED
(9)
Move lever backward for third function hydraulic arrangement. This causes oil to flow into other side of
auxiliary circuit.
(10)
A machine that is equipped with an implement hydraulic system with a fourth function has two auxiliary
control valves.
(11)
Move lever forward for fourth function hydraulic arrangement. This causes oil to flow into one side of
auxiliary circuit.
(12)
Move lever backward for fourth function hydraulic arrangement. This causes oil to flow into other side of
auxiliary circuit.
e.
Pilot Valve.
(1)
Pilot valve controls pilot pressure to
main control valve. Main control valve
controls oil flow to implement and work
tool cylinders.
(2)
In pilot hydraulic system, oil pressure is
generated in piston pump for steering
and pilot systems. Oil is directed to both
steering system and pilot system. Oil that
is directed to pilot system will flow
through a manifold and a pressure reduc-
ing valve. Next, hydraulic oil flows
through solenoid valve (hydraulic lock-
out) for pilot valve. Hydraulic oil flows
through an inlet filter screen in pilot
valve.
427-B1756
0003 00-161
