Komatsu PC200-8M0 Shop Manual page 160

SEN06120-00
1. Arm valve
2. R.H. travel valve
3. Swing valve
4. Boom valve
5. L.H. travel valve
6. Bucket valve
7. Service valve
8. Spool (arm)
9. Spool (R.H. travel)
10. Spool (swing)
11. Spool (boom)
12. Spool (L.H. travel)
13. Spool (bucket)
14. Spool (service)
15. Pressure compensation valve
16. Suction valve
17. Check valve (for boom regeneration circuit)
18. Check valve (for arm regeneration circuit)
19. Pump merge-divider EPC valve (for LS spool)
20. Pump merge-divider EPC valve (for main
spool)
21. LS shuttle valve
22. LS bypass plug
23. LS selector valve
24. Merge-divider valve
25. Arm quick return valve
26. Self-pressure reducing valve
27. Travel junction valve
28. Variable back pressure valve
29. Variable back pressure solenoid valve
30. Cooler check valve
31. Boom hydraulic drift prevention valve
32. Main relief valve (for boom, L.H. travel, bucket,
and attachment circuits)
Set pressure:
35.4 ± 0.3 MPa {360.5 ± 3 kg/cm
When one-touch power max. switch is set
to ON position:
38.0 ± 0.3 MPa {387 ± 3 kg/cm
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10-402
33. Main relief valve (for arm, R.H. travel, and
swing circuits)
34. Unload valve (for boom, L.H. travel, bucket,
and attachment circuits)
35. Unload valve (for arm, R.H. travel, and swing
circuits)
36. Suction safety valve
37. Suction safety valve
38. Suction safety valve
39. Suction 2-stage safety valve
40. Safety valve for hydraulic drift prevention valve
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402 Hydraulic system, Part 2
Functions and operation by valve
Set pressure:
35.4 ± 0.3 MPa {360.5 ± 3 kg/cm
When one-touch power max. switch is set
to ON position:
38.0 ± 0.3 MPa {387 ± 3 kg/cm
Cracking pressure:
2.5 ± 0.5 MPa {26 ± 5 kg/cm
Cracking pressure:
2.5 ± 0.5 MPa {26 ± 5 kg/cm
Set pressure:
24.5 ± 0.5 MPa {250 ± 5 kg/cm
Set pressure:
38.9 ± 0.5 MPa {397 ± 5 kg/cm
Set pressure:
31.4 ± 0.5 MPa {320 ± 5 kg/cm
1st stage set pressure:
24.5 ± 0.5 MPa {250 ± 5 kg/cm
2nd stage set pressure:
20.6 ± 0.5 MPa {210 ± 5 kg/cm
Set pressure:
38.9 ± 0.5 MPa {397 ± 5 kg/cm
PC200, 200LC, 220, 220LC-8M0
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