Komatsu PC20R-8 Shop Manual page 78

1
2
P
P
2) Boom swing, blade valve
. When boom swing spool (1) is operated, pump
pressure P is reduced by reducing valve (3) (in
P
the same way as in item 1), and is sent to the LS
circuit P .
LS
. When the blade spool (5) is operated, pump pres-
sure P flows from flow control valve (2), passage
P
e, and notch a in blade spool (5) through bridge
passage b to actuator circuit A.
. At the same time, the actuator circuit pressure
passes through notch f in hammer spool (6), then
goes through passage d, and acts on the left end
of piston (7). Piston (7) and reducing valve (3) then
move to the right.
10-60
7 T
3
d
e
P
LS
4
A
d
6
. As a result, pump pressure P
d, becomes the actuator circuit pressure, and is
sent to LS circuit P
M The boom swing and blade valves are different
from the boom, arm, bucket, and travel valves:
they share one pressure compensation valve
and bring in the LS pressure.
b
5
a
f
RKP00620
is reduced at notch
P
.
LS
PC20R-8 PC27R-8