4.9 Service procedure
When required Maintenance
4-36 WA470-6H – VEAM946100
Even in the areas where freezing is not an issue, the use of anti-
freeze 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.
KOMATSU Supercoolant (AF-NAC) is strongly recommended
wherever available.
To maintain the anticorrosion properties of Supercoolant (AF-
NAC), always keep the density of Supercoolant between 30%
and 68%.
When using KOMATSU Supercoolant (AF-NAC), there is no
need to use a corrosion resistor.
When no corrosion resistor is used, use the special cover (600-
411-9000). Please consult your KOMATSU distributor about the
method of installing.
When deciding the ratio of antifreeze to water, check the lowest
temperature in the past, and decide from the mixing table given
below.
It is actually better to estimate a temperature about 10°C lower
when deciding the mixing rate.
The mixing ratio depends on the ambient temperature, but it
should always be a minimum of 30% by volume (antifreeze/total
amount of coolant x 100).
The freezing temperature of undiluted antifreeze is -15°C. Do
not store undiluted antifreeze at a temperature of below -15°C.
Mixing rate of water and antifreeze
Min. atmospheric
temperature
°C -10 -15 -20 -25 -30
°F 14 5 -4 -13 -22
Amount of
antifreeze
Liter 18.3 21.4 24.4 27.5 30.5
US gal 4.83 5.64 6.44 7.25 8.06
Amount of water
Liter 42.7 39.7 36.6 33.6 30.5
US gal 11.28 10.47 9.67 8.86 8.06
Ratio % 30 35 40 45 50
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