Komatsu PC20R-8 Shop Manual page 84

A
L
1L
3
P
P
Steering when travelling
. When travelling in a straight line, if left travel spool
(1L) is returned to the neutral position and the
steering is operated, a difference (AR>AL) is gen-
erated in the load pressure of left and right travel
actuator circuits P
AL
P becomes the same pressure as AR (the side
LS
with the high load pressure).
. As a result, flow control valve (3) on the left travel
side is pushed on the left by LS circuit P
Because of this, the opening of the left notch a is
made smaller, so it becomes possible to operate
the steering when travelling.
. Damper b is provided in the circuit to dampen any
excessive characteristics in the opening or closing
of the travel junction circuit if the spool is operated
suddenly.
10-66
LEFT TRAVEL
P
AL
a
and P , and LS pressure
AR
.
LS
A
R
1R
P
LS
2
3
b
RIGHT TRAVEL
P
AR
c
RKP00433
PC20R-8 PC27R-8
2