Komatsu PC200-8M0 Shop Manual page 151

402 Hydraulic system, Part 2
Control valve
1. Unload valve
2. Safety valve for hydraulic drift prevention valve
(boom "RAISE" and arm "OUT")
3. Main relief valve
4. Variable back pressure valve
Arm valve
5. LS shuttle valve
6. Arm quick return valve
7. Pressure compensation valve (IN)
8. Spool
9. Suction safety valve (IN)
10. Cooler check valve
11. Regeneration circuit check valve
12. Suction valve (OUT)
13. Pressure compensation valve (OUT)
No. Check item
24 Check valve return spring
25 Check valve spring
26 Piston return spring
27 Check valve spring
28 Piston return spring
29 Piston return spring
PC200, 200LC, 220, 220LC-8M0
Standard dimension
Free length x
Installed
Outside diame-
length
ter
59.3 x 14.4 43
33.8 x 6 29
60.2 x 20 36
31.5 x 10.3 19.5
88.2 x 28.4 65
18.0 x 9.3 13.4
R.H. travel valve
14. LS shuttle valve
15. Pressure compensation valve (FORWARD)
16. Spool
17. Suction valve (FORWARD)
18. Suction valve (REVERSE)
19. Pressure compensation valve (REVERSE)
Swing valve
20. LS selector valve
21. Pressure compensation valve (L.H.)
22. Spool
23. Pressure compensation valve (R.H.)
Criteria
Repair limit
Load at
installed Free length
length
14.7 N
—
{1.5 kg}
13.7 N
—
{1.4 kg}
170 N
—
{17.3 kg}
5.9 N
—
{0.6 kg}
157 N
—
{16 kg}
36.1 N
—
{3.68 kg}
SEN06120-00
Unit: mm
Remedy
Load at
installed
length
11.8 N
{1.2 kg}
11 N
Replace spring if
{1.12 kg}
damaged or
135 N
deformed
{13.8 kg}
4.71 N
{0.48 kg}
126 N
{12.8 kg}
28.8 N
{2.94 kg}
10-402
9