Komatsu PC290LC-6K Operation & Maintenance Manual page 222

24. SERVICE PROCEDURE
6. Bleeding air from attachment (if installed)
For machines equipped with attachments such as the breaker, actu-
ate the attachment pedal about 10 times to bleed the air completely
from the attachment circuit while running the engine at low idling.
NOTICE
If the attachment bleeding procedure is specified by the manu-
facturer, bleed the attachment according to such procedure.
7. Operation
1. After completion of bleeding the air, stop the engine, and wait for
at least 5 minutes before starting operations. In this way, the air
bubbles are removed from the oil inside the hydraulic tank.
2. Check for any leakage of oil, and wipe off any oil that has been
spilled.
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