Komatsu PW160-7K Series Operation And Maintenance Manual page 303

MAINTENANCE
Procedure for bleeding air
Follow steps 1 & 2 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.
NOTICE
Be sure to insert seat before inserting plug.
REMARK
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 (162)" 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, for 5 minutes after engine start.
Extend and retract each cylinder 4 - 5 times without operating
it to the end of its stroke. (Stop approx. 100 mm before the
end of the stroke)
2. Next alter engine speed to Max., and 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.
SERVICE PROCEDURE
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