Komatsu PC500LC-10R Shop Manual page 236

COMPONENT PARTS OF HYDRAULIC SYSTEM
17: LS shuttle valve
18: Pressure compensation valve (FORWARD)
19: Spool
20: Suction valve (FORWARD)
21: Suction valve (REVERSE)
22: Pressure compensation valve (REVERSE)
Bucket valve
Sectional views (N-N, AA-AA, AB-AB, AD-AD, BB-BB)
Boom Hi-valve, arm Hi-valve
1: Boom Hi check valve
10-142
10 STRUCTURE AND FUNCTION
23: LS shuttle valve
24: Pressure compensation valve (DUMP)
25: Spool
26: Suction safety valve (DUMP)
27: Suction safety valve (digging)
28: Pressure compensation valve (digging)
2: Arm quick return valve
3: Pressure compensation valve (arm Hi IN)
PC500LC-10R