Komatsu PC210-8, Shop Manual

Page: 175 / 1200

10 Structure, function and maintenance standard UEN00100-00
PC210, 230, 240-8
47
CY: To work equipment cylinder
PCY: For pressure pickup port and equalizer circuit
PI:
From PPC valve
T: To tank
V: From control valve
1. Pilot spool
2. Spool (1st stage spool)
3. Spring (2nd stage spool)
4. Safety valve
5. Check valve
6. Spring
Unit: mm
No. Check item Criteria Remedy
7
Check valve spring
Standard size Repair limit
If damaged or
deformed, replace
spring.
Free length x
Outside diameter
Installed
length
Installed
load
Free length
Installed
load
20.8 x 12.2 13.5
12.7 N
{1.3 kg}
—
10.2 N
{1.04 kg}
8
Spool return spring 41.1 x 9.6 35.0
58.8 N
{6.0 kg}
—
47.1 N
{4.8 kg}
9
Spool return spring 41.9 x 25.8 41.0
78.5 N
{8.0 kg}
—
62.8 N
{6.4 kg}
10
Spool return spring 44.6 x 25.6 41.0
181 N
{18.5 kg}
—
145 N
{14.8 kg}