Komatsu PC500LC-10R Shop Manual page 232

COMPONENT PARTS OF HYDRAULIC SYSTEM
15: Pressure compensation valve (arm IN)
16: Main relief valve
17: Unload valve
18: Main relief valve
19: Spool (service)
20: Spool (arm Hi)
21: Spool (bucket)
Sectional views (C-C, D-D, AE-AE)
1: Suction valve(arm OUT)
2: Suction valve (right travel REVERSE)
10-138
10 STRUCTURE AND FUNCTION
22: Spool (left travel)
23: Spool (boom)
24: Spool (swing)
25: Spool (right TRAVEL)
26: Spool (arm)
27: Spool (boom Hi)
3: Suction valve (boom RAISE)
4: Suction valve (left travel REVERSE)
PC500LC-10R