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10 Structure, function and maintenance standard
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.
Spring (1st stage spool)
3.
Spring (2nd stage spool)
4.
Safety valve
5.
Check valve
6.
Spring
No.
Check item
7
Check valve spring
8
Spool return spring
9
Spool return spring
10
Spool return spring
PC300, 350-8
Standard size
Free length x
Installed
Outside diameter
length
20.8 x 12.2
13.5
41.1 x 9.6
35.0
41.9 x 25.8
41.0
44.6 x 25.6
41.0
Criteria
Repair limit
Installed
Free length
load
12.7 N
—
{1.3 kg}
58.8 N
—
{6.0 kg}
78.5 N
—
{8.0 kg}
181 N
—
{18.5 kg}
SEN01994-01
Unit: mm
Remedy
Installed
load
10.2 N
{1.04 kg}
If damaged or
deformed, replace
47.1 N
spring.
{4.8 kg}
62.8 N
{6.4 kg}
145 N
{14.8 kg}
61
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Troubleshooting
