Komatsu PC400LC-5 Operation & Maintenance Manual page 150

18.1.2 FUEL
The fuel pump is a precision instrument, and if fuel containing water or dirt is used, it cannot work
properly.
Be extremely careful not to let impurities get in when storing or adding fuel.
Always use the fuel specified in the Operation and Maintenance Manual.
Fuel may congeal depending on the temperature when it is used (particularly in low temperature
below-150, so it is necessary to change to a fuel that matches the temperature.
To prevent the moisture in the air from condensing and forming water inside the fuel tank, always
fill the fuel tank after completing the day's work.
Before starting the engine, or when IO minutes have passed after adding fuel, drain the sediment
and water from the fuel tank.
If the engine runs out of fuel, or if the filters have been replaced, it is necessary to bleed the air from
the circuit.
18.1.3 COOLANT
River water contains large amounts of calcium and other impurities, so if it is used, scale will stick
to the engine and radiator, and this will cause defective heat exchange and overheating.
Do not use water that is not suitable for drinking.
When using anti-freeze, always observe the precautions given in the Operation and Maintenance
Manual.
Komatsu machines are supplied with Komatsu original anti-freeze in the coolant when the machine
is shipped.
This anti-freeze is effective in preventing corrosion of the cooling system.
The anti-freeze can be used continuously for two years or 4000 hours. Therefore, it can be used as
it is even in hot areas.
Anti-freeze is inflammable, so be extremely careful not to expose it to flame or fire.
The proportion of anti-freeze to water differs according to the ambient temperature.
For details of the mixing proportions, see "24.2.2 CLEAN INSIDE OF COOLING SYSTEM".
If the engine overheats, wait for the engine to cool before adding coolant.
If the coolant level is low, it will cause overheating and will also cause problems with corrosion from
the air in the coolant.
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