Testing oil leakage 1
a Testing tools for oil leakage
a Test the oil leakage under the following condi-
tion.
q Hydraulic oil temperature: Within operating
range
1. Testing oil leakage from boom cylinder
1) Move the boom cylinder to the RAISE
stroke end and stop the engine.
k 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.
k 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.
k 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.
2. Testing oil leakage from arm cylinder
1) Move the arm cylinder to the IN stroke end
and stop the engine.
k 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.
k 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.
k 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.
Symbol Part No. Part name
Q
Commercially
available
Measuring cylinder
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