Komatsu PC500LC-10R Shop Manual page 259

10 STRUCTURE AND FUNCTION
When pumps are divided "when merge-divider valve selector signals (IS1) and
(IS2) are not given"
Arm side
(Front Pump)
5 8
To control valve
To control valve
1.
EPC valve drive signal (IS1) for the main spool is given. Main spool (1) moves to the left, and the port (E)
and port (F) are disconnected by the output pressure from merge-divider EPC valve.
2.
Pressurized oil discharged from two pumps is sent to each control valve groups.
P1 pressure: To bucket, left travel, boom
P2 pressure: To swing, right travel, arm
3.
EPC valve drive signal (IS2) for the LS spool (3) is given. It moves to the left, and the port (A) and port (C)
are connected by the output pressure from merge-divider EPC valve. Other ports are disconnected.
4.
LS pressure which is led from the control valve spools to LS circuits (5), (6), (7), and (8) is sent to respec-
tive control valves.
LS SEPARATION VALVE OF CONTROL VALVE
LS
Abbreviation for Load Sensing
FUNCTION OF LS SELECT VALVE OF CONTROL VALVE
The illustration shows the state of simultaneous operation of swing and travel RIGHT. "When pilot pressure (BP)
is supplied"
PC500LC-10R
Connected
A B C D
E
COMPONENT PARTS OF HYDRAULIC SYSTEM
IS2
Bucket side
(Rear Pump)
3 4 7 6
F
P1
IS1
ON ON
10
1
2
P2
9
AEP21618
10-165