Komatsu PC200-8M0, Shop Manual

Page: 151 / 1254

SEN06120-00
PC200, 200LC, 220, 220LC-8M0 10-402
9
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)
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.)
Unit: mm
No. Check item Criteria Remedy
24 Check valve return spring
Standard dimension Repair limit
Replace spring if
damaged or
deformed
Free length x
Outside diame-
ter
Installed
length
Load at
installed
length
Free length
Load at
installed
length
59.3 x 14.4 43
14.7 N
{1.5 kg}
—
11.8 N
{1.2 kg}
25 Check valve spring 33.8 x 6 29
13.7 N
{1.4 kg}
—
11 N
{1.12 kg}
26 Piston return spring 60.2 x 20 36
170 N
{17.3 kg}
—
135 N
{13.8 kg}
27 Check valve spring 31.5 x 10.3 19.5
5.9 N
{0.6 kg}
—
4.71 N
{0.48 kg}
28 Piston return spring 88.2 x 28.4 65
157 N
{16 kg}
—
126 N
{12.8 kg}
29 Piston return spring 18.0 x 9.3 13.4
36.1 N
{3.68 kg}
—
28.8 N
{2.94 kg}