Komatsu F30791, Shop Manual

Page: 84 / 298

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
and P
AR
, and LS pressure
P
LS
becomes the same pressure as AR (the side
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
LS
.
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
PC20R-8 PC27R-8
b c
RKP00433
A
L
P
AL
3
1L
a
2
P
P
3 2
1R
A
R
P
AR
P
LS
LEFT TRAVEL RIGHT TRAVEL