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MAINTENANCE
OUTLINES OF SERVICE
COOLANT AND WATER FOR DILUTION
The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
As a basic rule, we do not recommend the use of any coolant other than Komatsu genuine supercoolant
(AF-NAC). If you use another coolant, it may cause serious problems such as corrosion of the engine and parts
of the cooling system that use light metals such as aluminum.
When diluting the antifreeze coolant, use distilled water or tap water (soft water).
Natural water, such as a river water or well water (hard water), contains large amounts of minerals (calcium,
magnesium, etc.), and this makes it easier for scale to form inside the engine or radiator. Once scale is deposited
inside the engine or radiator, it is extremely difficult to remove. It also causes overheating due to poor heat
exchange, so when you dilute the coolant, we recommend that you use water with an overall hardness of less
than 100 PPM.
When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
Antifreeze coolant is flammable, so be sure to keep it away from flame.
The ratio of Supercoolant (AF-NAC) to water differs according to the ambient temperature.
For details of the ratio when mixing, see "CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-20)".
Even in areas where it is not necessary to prevent freezing, use Supercoolant (AF-NAC) at a mixing ratio of at
least 30% to prevent corrosion of the cooling system.
Supercoolant (AF-NAC) may be supplied in premix. In this case, never add diluting water.
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 due to air entering
the coolant.
GREASE
Grease is used to prevent seizure and noises at the joints.
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.
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 downtime. With KOWA, the
oil is periodically sampled and analyzed. This enables early detection of wear of the machine drive parts and other
problems.
We strongly recommend you to use this service. The oil analysis is carried out at actual cost, so the cost is low, and
the results of the analysis are reported together with recommendations which will reduce repair costs and machine
downtime.
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