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MAINTENANCE
BLEEDING AIR FROM HYDRAULIC SYSTEM
For details, see "STARTING ENGINE (PAGE 3-57)". If it is necessary to refer to the items for starting the engine,
moving the machine off, steering, or stopping, see the OPERATION section.
1.
Bleeding air from pump
1)
Loosen air bleed plug (1) installed to the drain port
and check that oil oozes out (air bleeding is com-
pleted).
2)
After completion of the air bleeding operation, tighten
the air bleed plug.
NOTICE
If the pump is run when the pump case is not full of oil,
there will be abnormal generation of heat, and this will lead
to premature failure of the pump.
2.
Starting engine
Start the engine. For details, see STARTING ENGINE
(PAGE 3-57).
Run the engine at low idling for 10 minutes after starting,
then start operations.
3.
Bleeding air from cylinders
1)
Run the engine at a mid-range speed (1650 rpm) and extend and retract the cylinders 4 to 5 times to a
point 100 mm (3.9 in) from the end of the stroke. (Be careful not to operate to the end of the stroke.)
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 immediately at high speed or the cylinder is operated to the end of its stroke, the air
inside the cylinder may cause damage to the piston packing.
4.
Bleeding air from swing motor
(only after draining oil from swing motor case)
1)
Run the engine at low idling, Loosen air bleeding
plug (1) and check that oil oozes out from air bleed-
ing plug (1).
NOTICE
When doing this, do not operate the swing.
2)
If no oil oozes out, stop the engine, remove air
bleeding plug (1), then fill the motor case with
hydraulic oil.
3)
After completing the air bleed operation, tighten air bleeding plug (1).
4)
Run the engine at low idling, and slowly swing the upper structure at least 2 times uniformly to the left
and right.
NOTICE
If the air is not bled from the swing motor, the motor bear-
ings may be damaged.
MAINTENANCE PROCEDURE
4-39
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