Komatsu Galeo PC800-8 Shop Manual page 160

SEN00383-03
3. Operation of reversible valve
1) When ON-OFF solenoid for reversible valve
is turned OFF
• If ON-OFF solenoid (1) for reversible valve is
turned "OFF", the hydraulic oil from the pump is
blocked by ON-OFF reversible valve (2) and port
C is connected to the tank circuit.
• Accordingly, reversible valve spool (3) is pushed
by reversible valve spool spring (4) to the right to
open motor port MA and then the hydraulic oil
flows in to revolve the motor forward (clockwise).
2) When ON-OFF solenoid for reversible valve
is turned ON
• If ON-OFF solenoid (1) for reversible valve is
turned "ON", ON-OFF reversible valve (2)
changes to let the hydraulic oil from the pump
flow through port C into spool chamber D.
• The hydraulic oil in chamber D pushes reversible
valve spool (3) to the left against reversible valve
spool spring (4).
As a result, motor port MB opens and the hy-
draulic oil flows in to revolve the motor in reverse
(counterclockwise).
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10 Structure, function and maintenance standard
PC800, 850-8