Komatsu D31EX-21, Operation & Maintenance Manual, Page: 186 / 256

OUTLINE OF SERVICE
MAINTENANCE
4-6
COOLANT 4
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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.
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When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
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Antifreeze is also effective in preventing corrosion on the parts of the engine cooling system. It may be contin-
uously used for two years or 4000 hours of operation, therefore it may be used throughout the year.
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Antifreeze is flammable, so be extremely careful not to expose it to flame or fire.
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The proper mixing proportion of the antifreeze depends on the ambient temperature. For the mixing propor-
tion, see “CLEAN INSIDE OF COOLING SYSTEM (4-23)“.
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If the engine overheats, wait for the engine to cool before adding coolant.
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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
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Grease is used to prevent twisting and noise at the joints.
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The nipples not included in the maintenance section are nipples for overhaul, so they do not need grease.
If any part becomes stiff after being used for long time, add grease.
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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) 4
The oil clinic samples the oil periodically and analyzes it. This is a preventive maintenance service, which pro-
vides early discovery of abnormal parts and wear of the drive parts of the machine. This then makes it possible to
ensure prevention of failures and reduction in downtime.
Komatsu's long years of experience and rich supply of accumulated data make it possible to accurately determine
the condition of your machine. This enables us to locate the problems and to recommend suitable and timely
repair methods.
The oil clinic charges the customer only the actual costs, and provides an immediate report of the results of the
analysis and recommendations for action to take. This low-cost service can save you high costs and inconve-
nience in the future, so we strongly recommend you to avail yourself of this service.
KOWA ANALYSIS ITEMS
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Analysis of metal wear particles
This uses an ICP (Inductively Coupled Plasma) analyzer to
measure the density of metal wear particles in the oil.