Komatsu PC500LC-10R Shop Manual page 258

COMPONENT PARTS OF HYDRAULIC SYSTEM
OPERATION OF MERGE-DIVIDER VALVE OF CONTROL VALVE
When pumps are merged "when merge-divider valve selector signals (IS1) and
(IS2) are OFF"
Arm side
(Front Pump)
5 8 A
To control valve
To control valve
1.
EPC valve drive signal (IS1) is not sent, and the outlet pressure of the merge divider EPC valve outlet pres-
sure is 0 MPa {0 kg/cm
2.
Main spool (1) is pushed to the right by the spring (2), and the port (E) and port (F) are interconnected.
3.
Pressurized oil (P1) and (P2) discharged from the two pumps merge at ports (E) and (F), then it is sent to
the control valve which requires it.
4.
LS spool (3) is pushed to the right by the spring (4) since EPC valve drive signal (IS2) is not given. Port (A)
and port (D) are connected. Port (B) and (C) are connected.
5.
LS pressure which is led from the control valve spools to LS circuits (5), (6), (7), and (8) is sent to all pres-
sure compensation valves.
10-164
Connected
Connected
B C D
E
2
} .
IS2
OFF
Bucket side
(Rear Pump)
3 4 7 6
F
P1
10 STRUCTURE AND FUNCTION
IS1
OFF
PC200-8
2 x EPC valve
0 1
1
2
P2
PC500LC-10R
9
AEP21617