Komatsu PC30MR-5 Operation & Maintenance Manual page 321

MAINTENANCE
METHOD FOR RELEASING PRESSURE IN HYDRAULIC CIRCUIT
1.
Start the engine.
2.
Set the lock lever to FREE position (F).
3.
Place the machine on a firm, level ground.
4.
Set the work equipment to the posture shown in the figure
according to the following procedure.
1)
Operate the work equipment control levers, and re-
tract arm cylinder and bucket cylinder to their stroke
end (maximum reach posture of arm and bucket).
2)
Operate the boom swing control pedal to swing the
boom to the center position.
3)
Operate the work equipment control lever slowly to the
boom LOWER direction, and lower the boom and
make tooth contact to the ground.
For the attachment such as crusher, etc., keep the attachment in closed state.
5.
Set the lock lever to LOCK position (L).
6.
Release the internal pressure in the hydraulic circuit within 15 seconds according to the following proce-
dure.
When the engine is stopped, the pressure inside the accumulator gradually goes down, so releasing the
internal pressure can be performed only immediately after the engine is stopped.
1)
Turn the starting switch to OFF position (A) to stop the
engine.
WENAM00150
MAINTENANCE PROCEDURE
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