Komatsu PW130ES-6K Operation & Maintenance Manual page 231

SERVICE PROCEDURE
Procedure for bleeding air
Follow steps 1 to 7 to bleed the air.
1. Bleeding air from pump
1. Loosen air bleeder (1) installed to the drain port, and check
that oil oozes out. (Completion of air bleeding)
2. After completing the air bleeding operation, tighten the air
bleeder.
NOTE: If the pump is operated without filling the pump case with
hydraulic oil, abnormal heat will be generated and this
may lead to premature damage of the pump.
2. Starting engine
Start the engine according to "STARTING ENGINE" on page 110
keep running the engine at low idling for 10 minutes, and carry out
the following procedure.
3. Bleeding air from cylinders
1. Run the engine at low idling, and extend and retract each cyl-
inder 4 - 5 times without operating it to the end of its stroke.
(Stop approx. 100 mm before the end of the stroke)
2. Next, operate each cylinder to the end of its stroke 3 - 4
times.
3. After this, operate each cylinder 4 - 5 times to the end of its
stroke to completely bleed the air.
NOTICE
If, at first, the engine is run 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 or other parts.
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 bleeding plug (1).
NOTICE
When doing this, do not operate the swing·
2. If oil does not ooze out, stop the engine, remove air bleeding
plug (1), fill the motor case with hydraulic oil.
3. After completion of the air bleed operation, tighten air bleed-
ing plug (1).
4. Run the engine at low idling, and swing 2 or more times
slowly and uniformly to the left and right.
NOTICE
If the air is not bled from the swing motor, the bearings of
the motor may be damaged.
230
MAINTENANCE.