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30 Testing and adjusting
Testing oil leakage
a Testing tools for oil leakage
Symbol
Part No.
Commercially
Q
available
a Test the oil leakage under the following condi-
tion.
Hydraulic oil temperature: Within operating
q
range
1.
Testing oil leakage from boom cylinder
1)
Move the boom cylinder to the RAISE
stroke end and stop the engine.
Release the residual pressure from
the piping on the boom cylinder
head side. For details, see "Releas-
ing residual pressure from hydrau-
lic circuit" (Operate the lever in the
boom RAISE direction only, how-
ever).
2)
Disconnect hose (1) on the cylinder head
side and block it with a plug.
Take care not to disconnect the
hose on the cylinder bottom side.
a Use the following part to block the
hose side.
07379-00640 (Flange #06)
3)
Run the engine at high idle and relieve the
boom circuit by raising the boom.
Take care not to "lower the boom".
4)
Start testing the oil leakage 30 seconds
after relieving is started and test for 1 min-
ute.
5)
After finishing test, return the removed
parts.
PC130-8
Part name
Measuring cylinder
1
2.
Testing oil leakage from arm cylinder
1)
Move the arm cylinder to the IN stroke end
and stop the engine.
Release the residual pressure from
the piping on the arm cylinder
head side. For details, see Releas-
ing residual pressure from hydrau-
lic circuit (Operate the lever in the
arm IN direction only, however).
2)
Disconnect hose (2) on the cylinder head
side and block it with a plug.
Take care not to disconnect the
hose on the cylinder bottom side.
a Use the following part to block the
hose side.
07376-70522 (Plug #05)
3)
Run the engine at high idle and relieve the
arm circuit by moving the arm IN.
Take care not to "move the arm
OUT".
4)
Start testing the oil leakage 30 seconds
after relieving is started and test for 1 min-
ute.
5)
After finishing test, return the removed
parts.
SEN04114-06
53
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Troubleshooting
