Doosan 7/26E, Operation And Maintenance Manual

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OPERATING INSTRUCTIONS 69
7/26E, 7/31E, 7/41
Make sure the fan belt is not broken, or off the pulley, and that the fan
turns when the engine is started. If the engine coolant level in the
reserve tank is low, look for leaks at the radiator hoses and
connections, radiator, and water pump. If you find major leaks, do not
run the engine until these problems have been corrected. If you do not
find a leak or other problem, WAIT UNTIL THE ENGINE HAS
COOLED DOWN then carefully add engine coolant to the reserve tank.
(Engine coolant is a mixture of ethylene glycol antifreeze and water.
See “Engine Care in cold season” for the proper antifreeze and
mixture.)
CAUTION: To avoid being burned, do not spill antifreeze or engine
coolant on the exhaust system or hot engine parts. Under some
conditions the ethylene glycol in engine coolant is combustible.
If the engine coolant level in the reserve tank is at the correct level but
there is still an indication of an overheat condition and no cause was
found, please consult your local Doosan branch or dealer.
Overcooling
Operating the engine at low coolant temperature will not only increase
the oil and fuel consumption but also will lead to premature parts wear
which may result in engine failure. Ensure that the engine reaches
normal operating temperature 75 to 85°C (167 to 185°F) within ten
minutes of starting.
(3) Hourmeter
This meter indicates the machine operation hours. Make sure that the
meter is always working during engine operation. Periodical machine
maintenance is scheduled on the operation hours indicated on the
hourmeter.
(4) Liquid and Exhaust Smoke Leakage
Make regular checks for lubricant, fuel, coolant and exhaust smoke
leakage.
(5) Abnormal Engine Noise
In the event of any abnormal engine noise, please consult your local
Doosan branch or dealer.
(6) State of the Exhaust Smoke
Check for any abnormal exhaust smoke color.
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