TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
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ELECTRO-HYDRAULIC SYSTEM - CONTINUED
15.
End Cover Valve Manifold.
a.
End cover valve manifold (92) contains hydraulic lockout solenoid valve (99), pilot pressure reducing valve (104),
and margin pressure relief valve (114).
b.
Pilot pressure reducing valve (104) receives oil from implement piston pump through tank port (B). Valve reduces
pressure of system oil to pilot pressure. Pilot pressure oil is sent to pilot circuit.
c.
Margin pressure relief valve (114) receives pump oil from pump port (B) and load sensing oil from signal duplicat-
ing reducing valve. Relief valve allows system oil at pressure above margin pressure setting over signal oil to drain
to hydraulic tank through tank port (C).
d.
Hydraulic lockout solenoid valve (99) is controlled by an implement ECM output. Hydraulic lockout switch in
operator's cab provides input to implement ECM regarding desired pilot hydraulic system status. When solenoid
valve is energized, pilot hydraulics are enabled. Pilot hydraulics are disabled when solenoid is de-energized.
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