Komatsu PC500LC-10R, Shop Manual, Page: 649 / 758

Unit: mm
No. Item Judgment criteria Remedy
1
Variable back pressure valve
return spring
Standard dimensions Repair limit
Replace the
spring if dam-
aged or de-
formed
Free length
x outside di-
ameter
Installed
height
Load at in-
stalled
height
Free
length
Load at in-
stalled
height
117.84 x
31.8
52
31.4 N
{3.2 kg}
-
25.1 N
{2.56 kg}
2
Check valve spring of hy-
draulic drift prevention valve
71.1 x 19.3 31
35.3 N
{3.6 kg}
-
28.2 N
{2.88 kg}
3 Check valve spring 33.8 x 6 29
13.7 N
{1.4 kg}
-
11 N
{1.12 kg}
4
Check valve spring for re-
generation circuit
31.5 x 10.3 19.5
6.2 N
{0.63 kg}
-
4.71 N
{0.48 kg}
60 MAINTENANCE STANDARD MAINTENANCE STANDARD OF CONTROL VALVE
PC500LC-10R 60-45