Komatsu PC88MR-10 Shop Manual page 1304

60 Maintenance standard
Anti-drop valve for boom
No. Item
Spool return spring
1
Spool return spring
2
Check valve spring
3
60-52
Judgment criteria
Standard dimensions
Free
Installed
length x
height
outside
diameter
24.8×16.8 22.5
19.1×8 13.5
31.90×5.4 26
Repair limit
Load at
Free
installed
length
height
55.4 N
{5.65 kg}
24.7 N
{2.52 kg}
16.5 N
{1.68 kg}
Unit: mm
Remedy
Load at
installed
Replace
height
(Replace
44.3 N spring if
damaged or
{4.52 kg}
deformed as
18.04 N
well)
{1.84 kg}
12.1 N
{1.23 kg}
PC88MR-10