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LUBRICANTS, COOLANT AND FILTERS
LUBRICANTS, COOLANT AND FILTERS
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC
Oil
Oil is used in the engine and work equipment under extremely severe conditions (high temperature, high pres-
sure), and is deteriorates with use.
Always use oil that matches the grade and temperature for use given in the Operation and Maintenance Man-
ual.
Even if the oil is not dirty, always change the oil after the specified interval.
Oil corresponds to blood in the human body, so always be careful when handling it to prevent any impurities
(water, metal particles, dirt, etc.) from getting in.
The majority of problems with machine are caused by the entry of such impurities.
Take particular care not to let any impurities get in when storing or adding oil.
Never mix oils of different grades or brands.
Always add the specified amount of oil.
Having too much oil or too little oil are both causes of problems.
If the oil in the work equipment is not clear, there is probably water or air getting into the circuit. In such cases,
please contact your Komatsu distributor.
When changing the oil, always replace the related filters at the same time.
We recommend you have an analysis made of the oil periodically to check the condition of the machine. For
those who wish to use this service, please contact your Komatsu distributor.
At the time of shipping from the factory, SAE1OWCD is used for hydraulic type of oil. When HO46-hydraulic oil
is going to be used, change specified amount of oil (whole amount). The hydraulic oil that is not recommended
by Komatsu can cause clogging of oil filter, so do not use it. The portion of the oil that remains in the piping or
cylinders will not be a problem even though it will be mixed into new oil.
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 -15°C).
It is necessary to change for the fuel that is suitable for 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 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.
Cooling System Coolant
River water contains large amount 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 flammable, 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 "CLEAN INSIDE OF COOLING SYSTEM ( 4-23 )".
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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