Komatsu PW130ES-6K Operation & Maintenance Manual page 172

MAINTENANCE.
When carrying out inspection or maintenance of the
❍
hydraulic circuit, always bleed the air from the hydraulic
tank to remove the internal pressure.
Periodic maintenance includes the inspection of the hydraulic
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oil level, replacement of the filter and refilling of hydraulic oil.
When the high pressure hose, etc. is removed, check the O-
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ring for damage. If necessary, replace it.
After the hydraulic filter element and strainer are cleaned or
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replaced, or after the hydraulic system is repaired or replaced
or the hydraulic piping is removed, bleed air from the hydrau-
lic circuit.
The accumulators are charged with high-pressure nitrogen
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gas. Incorrect handling may be dangerous.
For the handling procedure, see "HANDLING ACCUMU-
LATOR" on page 246.
OUTLINES OF SERVICE
171