Komatsu D65EX-12 Operation & Maintenance Manual page 174

OUTLINE OF SERVICE
COOLANT
River water contains large amounts 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 proper mixing proportion of the antifreeze depends on the ambient temperature. For the mixing propor-
tion, see "CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-25)".
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.
GREASE
Grease is used to prevent twisting and noise at the joints.
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.
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.
CARRYING OUT KOWA (Komatsu Oil Wear Analysis)
KOWA is a maintenance service that makes it possible to prevent machine failures and down-time. With KOWA,
the oil is periodically sampled and analyzed. This enables early detection of wear of the machine drive parts and
other abnormalities.
Periodic use of KOWA makes the following possible:
It enables abnormalities to be detected early, leading to reduction of repair costs and machine downtime.
It enables repair schedules to be planned, leading to improved machine availability.
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MAINTENANCE