Komatsu PC200-8M0 Shop Manual page 176

SEN06120-00
When oil flowing from two pumps are divided [pump merge-divider valve changeover signals (IS1)
and (IS2) are ON]
Operation
q Since drive signal (IS1) of the main spool is ON, main spool (1) is moved to the left by the output pres-
sure from the pump merge-divider EPC valve. As a result, port (E) is disconnected from port (F).
q The pressurized oil from the two pumps are sent to respective control valve groups.
Pressure P1: To bucket, left travel, boom
Pressure P2: To swing, right travel, arm
When drive signal (IS2) of the EPC valve for LS spool (3) becomes ON, LS spool (3) is also moved to
q
the left by the output pressure from the pump merge-divider EPC valve. As a result, ports (A) and (C)
are interconnected, and other ports remain disconnected from each other.
The LS pressures transmitted from respective control valve spools through LS circuits (5), (6), (7), and
q
(8) are transmitted to respective control valves.
34
10-402
402 Hydraulic system, Part 2
Functions and operation by valve
PC200, 200LC, 220, 220LC-8M0