Doosan LIGHTSOURCE V9, Operation And Maintenance Manual

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OPERATION
LIGHTSOURCE V9
ENGINE STOPPING
(1) Close service valves.
(2) Before stopping the engine, cool down the engine by operating it at
reduced load about three minutes. In this period, check the engine
noise for abnormalities.
LONG TERM STORAGE
If the equipment is to be out of operation for an extended period, it
should be started at least once per week and run on load for about 15
minutes after it has reached normal operating temperature.
If this is not possible,
Do not drain the cooling water
Clean dust or oil from the engine extension
Either fill completely or drain the fuel tank
Grease accelerator joints and electrical connections
Disconnect the negative battery terminal