Komatsu PC400LC-5 Operation & Maintenance Manual page 154

18. OUTLINES OF SERVICE
18.4 FK&d&IONS WHEN DISASSEMBLING
it slowly to release the internal pressure, and remove it carefully.
When disassembling the machine or removing piping for
inspection or maintenance, always release the remaining pressure
as follows.
18.4.1 RELEASING PRESSURE IN
WORK EQUIPMENT
CIRCUIT, SWING CIRCUIT, TRAVEL CIRCUIT
1.
2.
3.
4.
5.
Lower the work equipment to the ground on a firm, flat surface
as shown in the diagram, then stop the engine.
Set the lock lever to the FREE position.
Operate all the work equipment levers to the end of their travel
within 5 - 6 seconds of stopping the engine.
Remove the cap from the hydraulic tank.
Start the engine, run for approx. IO seconds, then stop the
engine.
Do not run the engine at above 1000 rpm.
Place the work equipment levers at neutral.
Operate all the work equipment levers to the end of their travel
within 5 - 6 seconds of stopping the engine.
Repeat Steps 4 - 5 three times.
18.4.2 RELEASING PRESSURE FROM ACCUMULATOR
CIRCUIT
l
Pilot circuit
After stopping the engine, place lock lever @ in the FREE
position, operate all the work equipment levers 3 - 4 times to the
end of their travel, then wait for at least 1 minute for the pressure
to be released.
Do not loosen any piping for at least 1 minute after releasing the
pressure.
AE082200
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