LUBRICANTS, COOLANT AND FILTERS MAINTENANCE
4-6
Cooling System Coolant 4
q 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.
q When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
q 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.
q Antifreeze is flammable, so be extremely careful not to expose it to flame or fire.
q 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 (4-25)“.
q If the engine overheats, wait for the engine to cool before adding coolant.
q If the coolant level is low, it will cause overheating and will also cause problems with corrosion from the air in
the coolant.
Grease 4
q Grease is used to prevent twisting and noise at the joints.
q This construction equipment is used under heavy-duty conditions. Always use the recommended grease and
follow the change intervals and recommended ambient temperatures given in this Operation and Maintenance
Manual.
q The nipples not included in the MAINTENANCE section are nipples used when overhauling, so they do not
need grease.
If any part becomes stiff or generates noise after being used for a long time, grease it.
q Always wipe off all of the old grease that is pushed out when greasing.
Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would
cause wear of the rotating parts.
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