Komatsu WA500-6H, Руководство по эксплуатации и техническому обслуживанию

Страница: 261 / 412

4.2 Outlines of service
Maintenance Handling oil, fuel, coolant, grease and carrying out KOWA (KOMATSU Oil Wear Analysis)
WA500-6H – VEAM430100
4-7
Coolant and water for dilution
z
The coolant has the important function of preventing corro-
sion 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 Super-
coolant (AF-NAC). KOMATSU Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties
and can be used continuously for 2 years or 4000 hours.
KOMATSU Supercoolant (AF-NAC) is strongly recom-
mended wherever available.
z
When using KOMATSU Supercoolant (AF-NAC), there is no
need to use a corrosion resistor.
For details, see "Clean inside of cooling system (4-31)".
z
When diluting the antifreeze coolant, use distilled water or
tap water (soft water).
z
Natural water, such as a river water or well water (hard
water), contains large amounts of minerals (calcium, magne-
sium, 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.
z When using antifreeze, always observe the precautions
given in the Operation and Maintenance Manual.
z Antifreeze is flammable, so be extremely careful not to
expose it to flame or fire.
z The ratio of Supercoolant (AF-NAC) to water differs accord-
ing to the ambient temperature.
For details of the mixing proportions, see "Clean inside of
cooling system (4-31)".
Supercoolant (AF-NAC) may be supplied already mixed. In
such cases, never dilute with water.
z If the engine overheats, wait for the engine to cool before
adding coolant.
z If the coolant level is low, it will cause overheating and will
also cause problems with corrosion from the air in the cool-
ant.