Komatsu PC118MR-8 Operation And Maintenance Manual page 292

GUIDE TO MAINTENANCE
q It is advisable to have the oil periodically analysed in order to check the conditions of the machine. The
analysis must be carried out by specialized personnel at Komatsu distributor.
q When using a commercially available oil, the oil change interval may need to be reduced.
The KOWA analysis should ideally be used to perform detailed checks of the oil characteristics.
The engine oil must be selected very carefully, since it lubricates the engine, which is the machine's heart; the
main maintenance operations required for the engine oil are the following:
Q Daily check of the oil level;
Q check of the degree of pollution of the oil;
Q periodical change.
Fuel
q Always fill the fuel tank at the end of each working day to prevent moisture in the air condensing and turning
into water inside the fuel tank.
q Do not allow impurities to enter during the storage of the fuel or refuelling.
REMARK
The fuel pump is a precision instrument and can not function properly if fuel containing water or dirt is used.
q Always use fuel suitable for the engine. Other fuels with different specifications may damage the engine or
reduce its power.
q If fuel runs out, or if the fuel filter has been replaced, it is necessary to bleed the circuit.
q If there are foreign bodies in the fuel tank, wash the tank and the fuel circuit.
q Use only low- or ultra low-sulphur content fuel.
NOTICE
Always use diesel oil as fuel.
To ensure good characteristics of fuel consumption and exhaust gases, the engine fitted to this machine
uses an injection device at high pressure.
This device needs that components and lubrication have high precision characteristics, therefore, its
working life may be considerably reduced if you use low viscosity fuel with poor lubricating capacity.
Coolant
q The coolant has the important function of preventing both corrosion and freezing.
Komatsu machines are supplied with Supercoolant Komatsu (AF-NAC). The Supercoolant Komatsu (AF-NAC)
has high anticorrosion, antifreeze and coolant properties, so it can be used regularly for 2 years or 2000 hours.
As a general rule, we do not recommend the use of refrigerants different than Supercoolant Komatsu (AF-
NAC). If another coolant is used, you may experience problems such as corrosion of the engine and the
aluminium components of the cooling system.
q When using antifreeze, always observe the instructions in the Use and Maintenance Manual.
q The coolant Supercoolant is already diluted with distilled water and is non-flammable.
q Supercoolant (AF-NAC) is diluted with distilled water containing no ions or hardener substances. Never dilute
Supercoolant with normal water.
q The density of the Supercoolant (AF-NAC) liquid diluted with water varies depending on the surrounding
temperature.
For more details on the density of the coolant, see "CLEANING OF THE COOLING SYSTEM AND
CHANGING THE COOLANT (4-80)".
Even in areas where preventing the risk of freezing is not necessary, use Supercoolant (AF-NAC) with a
density greater than 30% to prevent the risk of corrosion of the cooling system.
q If the engine overheats, let it cool before adding coolant.
q When the coolant level is low it causes engine overheating and corrosion problems due to air in the coolant.
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MAINTENANCE
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