3. Testing oil leakage from bucket cylinder
1) Move the bucket cylinder to the CURL
stroke end and stop the engine.
k Release the residual pressure from
the piping on the bucket cylinder
head side. For details, see Releas-
ing residual pressure from hydrau-
lic circuit (Operate the lever in the
bucket CURL direction only, how-
ever).
2) Disconnect hose (3) 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.
07376-70422 (Plug #04)
3) Run the engine at high idle and relieve the
bucket circuit by curling the bucket.
k Take care not to "dump the bucket".
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.
4. Testing oil leakage from swing motor
1) Disconnect 2 drain hoses (4) and block
the hose side with plugs.
a Use the following parts to block the
hose side.
07376-70315 (Plug #03)
2) Turn the swing lock switch ON.
3) Run the engine at high idle and relieve the
swing circuit by swinging.
a Start testing the oil leakage 30 sec-
onds after relieving is started and test
for 1 minute.
a After testing 1 time, swing 180°, and
then test again.
4) After finishing test, return the removed
parts.
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