Komatsu Utility PC12R-8 MISTRAL, Руководство по ремонту

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2) When control valve is operated, pump discharge pressure P
P1
is set to LS pressure P
LS
+19,6
9,8
bar (20
10
kg/cm
2
).
OPERATION
Control valve operated
. When the control valve is operated, LS pressure
P
LS
is generated and acts on area S3 at the right
end of spool (1).
. When the differential pressure between pump di-
scharge pressure P
P1
and LS pressure P
LS
raises
and reaches 19,6
9,8
bar (20
10
kg/cm
2
), spool
(1) is moved to the left, and the oil flowing to tank
circuit when control valve is at HOLD flows to ac-
tuator circuit.
. The operation is same when fine control is carried
out on the control valve.
. When the pump discharge amount become smaller
than actuator requirement amount (Pump dischar-
ge amount<Actuator requirement amount) with
operating actuators at same time, spool (1) is mo-
ved to the left more till full stroke. As a result, pump
circuit P
P1
, P
P2
and tank circuit T are shut off, and
all the pump discharge amount Q flows to the ac-
tuator circuit.
10-49
PC12R-8 PC15R-8
To actuator
RKP00361
B
A
1
P
P1
S
3
T
S
S
1
2
P
LS
P
P2
T
3
S
2