Komatsu ecot3 PC300LC-8 Shop Manual page 139

10 Structure, function and maintenance standard
Boom Hi and arm Hi valve
1. Boom Hi check valve
2. Quick return valve
3. Pressure compensation valve (Arm Hi in)
4. Arm Hi spool
5. Safety-suction valve (Arm Hi in)
6. Boom Hi spool
7. Pressure compensation valve (Boom Hi raise)
Service valve 1
8. LS shuttle valve
9. Pressure compensation valve
10. Spool
11. 2-stage safety-suction valve
12. Safety-suction valve
Service valve 2
13. LS shuttle valve
14. Pressure compensation valve
15. Spool
16. Safety-suction valve
17. Unload valve
18. Main relief valve
19. LS bypass plug
PC300, 350-8
SEN01994-01
13