Komatsu PW118MR-11, Operation & Maintenance Manual, Page: 359 / 462

METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT
METHOD FOR BLEEDING AIR FROM PUMP
Perform it when any hydraulic component or oil has been replaced.
NOTICE
If the pump is operated without filling the pump case with hydraulic oil, abnormal heat will be generated
and this may cause a premature damage to the pump. Bleed air securely.
1.
Run the engine at low idle.
2.
Open the rear right cover.
3.
Loosen the cap (1) on the pump by 1 turn and check that
the oil comes out.
4.
Having bled the air, tighten the cap (1).
Tightening torque: 9,8-12,7 Nm (1,0-1,3 kgm)
METHOD FOR BLEEDING AIR FROM PUMP AND HYDRAULIC TANK
Perform it when any hydraulic component or oil has been replaced.
NOTICE
If you run the engine at high speed without bleeding air from the piping between the pump and hydraul-
ic tank, the pump may heat abnormally and may be broken in a short period.
1.
Start the engine and run at medium speed.
2.
Operate the work equipment slowly for approximately 5 minutes, and bleed air.
METHOD FOR BLEEDING AIR FROM CYLINDER
Perform it when any hydraulic component or oil has been replaced.
NOTICE
If the engine runs at high speed immediately after startup or a cylinder is pushed up to its stroke end,
air mixed into the cylinder may cause damage to the piston packing or etc.
1.
Start the engine and run it at low idle.
2.
With the engine idling, extend and retract each cylinder 4 to 5 times, taking care that a cylinder is not
moved to the stroke end. (Stop the cylinder approximately 100 mm short of its stroke end.)
3.
Operate each cylinder 4 to 5 times to each stroke end.
All air is bled.
METHOD FOR BLEEDING AIR FROM SWING MOTOR
Bleed air only when the oil in the swing motor case is drained.
NOTICE
If the air is not bled from the swing motor, the motor bearings may be damaged.
RKA65210
MAINTENANCE MAINTENANCE PROCEDURE
4-31
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