Komatsu ecot3 PC300LC-8 Shop Manual page 137

10 Structure, function and maintenance standard
1. Return spring
2. Merge-divide valve (for LS)
3. Valve (Sequence valve)
4. Spring (Sequence valve)
5. Merge-divide valve (Main)
6. Return spring
Boom valve
7. Drift prevention valve
8. LS shuttle valve
9. Pressure compensation valve (Lower)
10. Spool
11. 2-stage safety-suction valve (Lower)
12. Regeneration circuit check valve
13. Suction valve (Raise)
14. Pressure compensation valve (Raise)
L.H. travel valve
15. Merge-divider valve (travel junction valve)
16. Return spring
17. LS shuttle valve
18. Pressure compensation valve (Forward)
19. Spool
20. Suction valve (Forward)
21. Suction valve (Reverse)
22. Pressure compensation valve (Reverse)
Bucket valve
23. LS shuttle valve
24. Pressure compensation valve (Curl)
25. Spool
26. Safety-suction valve (Curl)
27. Safety-suction valve (Dump)
28. Pressure compensation valve (Dump)
No. Check item
29
Spool return spring
30
Check valve spring
31
Spool return spring
32
Check valve spring
33
Check valve spring
34
Check valve spring
35
Piston return spring
PC300, 350-8
Standard size
Free length x Installed
Outside diameter length
46.6 x 21.8 33.0
70.9 x 18.0 56.0
64.5 x 32.3 63.0
33.0 x 12.0 26.0
16.4 x 8.9 11.5
31.5 x 10.3 19.5
30.7 x 20.5 23.0
Criteria
Repair limit
Installed
Free length
load
157 N
—
{16.0 kg}
250 N
—
{25.5 kg}
178 N
—
{18.1 kg}
35.3 N
—
{3.6 kg}
13.7 N
—
{1.4 kg}
5.9 N
—
{0.6 kg}
50.0 N
—
{5.1 kg}
SEN01994-01
Unit: mm
Remedy
Installed
load
126 N
{12.8 kg}
200 N
{20.4 kg}
142 N If damaged or
{14.5 kg} deformed, replace
spring.
28.2 N
{2.88 kg}
11.0 N
{1.12 kg}
4.71 N
{0.48 kg}
40.0 N
{4.08 kg}
11