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MAINTENANCE PROCEDURE
1) Loosen air bleed plug (1) and check that oil oozes out
from the air bleeder (3).
2) If oil (4) does not ooze out, remove the pump case drain
hose and elbow, then fill the inside of the pump case with
hydraulic oil through drain port (2).
If the mouthpiece is lower than the surface of the oil in the
hydraulic tank, oil will flow out from the drain hole when it is
removed, so secure the mouthpiece of the hose at a position
higher than the level of the oil in the hydraulic tank.
3) After completing the air bleed operation, tighten air bleed
plug (1) and install the drain hose.
NOTICE
If the drain hose is installed first, oil will spurt out from
plug (1) hole. If the pump is operated without filling the
pump case with hydraulic oil, abnormal heat will be gener-
ated and this may cause premature damage to the pump.
2. Starting engine
Cancel the automatic warming-up operation before starting the engine. Run the engine at low idling for 10
minutes after starting it, then go on to the next operation.
3. Bleeding air from cylinders
1) Run the engine at low idle, and extend and retract each cylinder 4 to 5 times, taking care that a cylinder is not
moved to the end of its stroke. (Stop the cylinder approx. 100 mm short of its stroke end)
2) Next, operate each cylinder 3 to 4 times to the end of its stroke.
3) Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.
NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end, air
taken inside the cylinder may cause damage to the piston packing.
4. Bleeding air from swing motor (bleed the air only when the oil inside the swing motor case has been drained)
q When oil has been drained from inside swing motor case
1) Run the engine at low idling, loosen hose (1), and check
that oil oozes out from hose (1).
NOTICE
When doing this, do not operate the swing.
2) If oil does not ooze out, stop the engine, remove hose (1),
and fill the inside of the motor case with hydraulic oil.
3) After completely bleeding the air, tighten hose (1).
4) Run the engine at low idle, and slowly swing the upper structure at least 2 times uniformly to the left and right.
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MAINTENANCE
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