Komatsu ecot3 Operation And Maintenance Manual page 268

MAINTENANCE
FUEL
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.
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 for the temperature in the Operation and Maintenance Manual.
If the fuel is used at temperatures lower than the specified temperature (particularly at temperatures below -15
°C (5°F), the fuel will solidify.
If the fuel is used at temperatures higher than the specified temperature, the viscosity will drop, and this may
result in problems such as a drop in output.
Before starting the engine, or when 10 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.
If there is any foreign material in the fuel tank, wash the tank and fuel system.
NOTICE
Always use diesel oil for the fuel.
To ensure good fuel consumption characteristics and exhaust gas characteristics, the engine mounted on this machine uses an
electronically controlled high-pressure fuel injection device. This device requires high precision parts and lubrication, so if low
viscosity fuel with low lubricating ability is used, the durability may drop markedly.
COOLANT AND WATER FOR DILUTION
Komatsu genuine SUPERCOOLANT (AF-NAC) has the important function of preventing corrosion as well as
preventing freezing.
Even in the areas where freezing is not an issue, the use of antifreeze COOLANT is essential.
Komatsu machines are supplied with Komatsu SUPERCOOLANT (AF-NAC). SUPERCOOLANT (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
As a basic rule, we do not recommend the use of any COOLANT other than SUPERCOOLANT (AF-NAC). If you
use another COOLANT, it may cause serious problems, such as corrosion of the engine and aluminum parts of
the cooling system.
When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
COOLANT is already diluted with distilled water, so it is not flammable.
The density used for the COOLANT differs according to the ambient temperature.
For details of the density of the COOLANT, see "CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-27)".
Even in the areas where it is not considered necessary to prevent freezing, always use COOLANT with a density
of over 30% in order to prevent corrosion of the cooling system.
COOLANT is diluted with distilled water that does not contain any ions or water-hardening substances. Never
dilute the COOLANT with ordinary water.
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 due to air entering
the coolant.
OUTLINE OF SERVICE
4 - 5