Komatsu Galeo HD405-7R, Operation & Maintenance Manual

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MAINTENANCE
OUTLINE OF SERVICE
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 fuel that matches the temperatures given in the Operation and Maintenance Manual.
If the fuel is used in temperatures lower than the specified temperature for use (particularly at temperatures
of lower than -15
°
C), the properties of the fuel will make it congeal.
If the fuel is used in temperatures higher than the specified temperature for use, the viscosity will go down, and
this may result in a drop in output or other problems.
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
Use only diesel fuel.
The engine mounted on this machine employs electronic control and a high-pressure fuel injection device to obtain good fuel
consumption and good exhaust gas characteristics. For this reason, it requires high precision for the parts and good lubrication.
If kerosene or other fuel with low lubricating ability is used, there will be a big drop in durability.
COOLANT AND WATER FOR DILUTION
The coolant 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). Komatsu 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 Komatsu genuine supercoolant
(AF-NAC). If you use another coolant, it may cause serious problems such as corrosion of the engine and parts
of the cooling system that use light metals such as aluminum.
When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor. For details, see
"CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-28)".
When diluting the antifreeze coolant, use distilled water or tap water (soft water).
Natural water, such as a river water or well water (hard water), contains large amounts of minerals (calcium,
magnesium, etc.), and this makes it easier for scale to form inside the engine or radiator. Once scale is deposited
inside the engine or radiator, it is extremely difficult to remove. It also causes overheating due to poor heat
exchange, so when you dilute the coolant, we recommend that you use water with an overall hardness of less
than 100 PPM.
When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
Antifreeze coolant is flammable, so be sure to keep it away from flame.
The ratio of Supercoolant (AF-NAC) to water differs according to the ambient temperature.
For details of the ratio when mixing, see "CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-28)".
Even in areas where it is not necessary to prevent freezing, use Supercoolant (AF-NAC) at a mixing ratio of at
least 30% to prevent corrosion of the cooling system.
Supercoolant (AF-NAC) may be supplied in premix. In this case, never add diluting 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.
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