Komatsu PC500LC-10R Shop Manual page 230

COMPONENT PARTS OF HYDRAULIC SYSTEM
B3: To boom cylinder head
B4: To swing motor
B5: To right travel motor
B6: To arm cylinder bottom
B-1: To arm cylinder bottom
B-2: To attachment
BP1: From LS select solenoid valve
BP5: From machine push-up solenoid valve
BP6: From attachment selector solenoid valve
P1: From R.H. work equipment PPC valve (bucket
CURL)
P2: From R.H work equipment PPC valve (bucket
DUMP)
P3: From travel PPC valve (left travel REVERSE)
P4: From travel PPC valve (left travel FORWARD)
P5: From R.H work equipment PPC valve (boom
RAISE)
P6: From R.H work equipment PPC valve (boom
LOWER)
P7: From L.H work equipment PPC valve (swing
LEFT)
P8: From L.H work equipment PPC valve (swing
RIGHT)
P9: From travel PPC valve (right travel REVERSE)
P10: From travel PPC valve (right travel FORWARD)
P11: From L.H work equipment PPC valve (arm OUT)
P12: From L.H work equipment PPC valve (arm IN)
1: Variable back pressure valve
2: Variable back pressure solenoid valve
3: Merge-divider EPC valve (for LS spool)
4: Merge-divider EPC valve (for main spool)
5: Arm check valve
6: Boom hydraulic drift prevention valve
7: Boom Hi-valve, arm Hi-valve
10-136
10 STRUCTURE AND FUNCTION
P-3: From R.H. attachment PPC valve
P-4: From R.H. attachment PPC valve
PLS1: To front pump LS valve
PLS2: To rear pump LS valve
PLSC: LS pressure pickup port
PP1: From front pump
PP2: From rear pump
PPC: Pilot source pressure pickup port
PP1S: Front pump oil pressure sensor mounting port
PP2S: Rear pump oil pressure sensor mounting port
PPS1: To front pump LS valve
PPS2: To rear pump LS valve
PR: To solenoid valve, PPC valve, and EPC valve
PST: From travel junction solenoid valve
PX1: From 2-stage relief solenoid valve
PX2: From 2-stage relief solenoid valve
T: To tank
T1: To tank
TS: To tank
TSW: From swing motor
IS1: Merge-divider EPC valve (main spool) drive sig-
nal
IS2: Merge-divider EPC valve (LS spool) drive signal
IS3: Variable back pressure solenoid valve drive signal
8: Boom Hi check valve
9: 6-spool valve
10: Cover A
11: Service valve
12: Arm quick return valve
13: Cover B
14: Merge-divider valve
PC500LC-10R