Komatsu WA500-6H Operation & Maintenance Manual page 286

4.9 Service procedure
When required
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 (18°F)
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 (5°F).
Do not store undiluted antifreeze at a temperature of below -
15°C (5°F).
Mixing rate of water and antifreeze
Min. atmospheric
temperature
Amount of
antifreeze
Amount of water
Ratio
If the jobsite changes frequently and it is difficult to manage the
density of the antifreeze, a density of up to 50% can be permit-
ted.
4-32
°C -10
°F 14
Liter 36
US gal 9.51
Liter 84
US gal 22.29
% 30
-15 -20
5 -4
43 49
11.41 13.00
77 71
20.29 18.70
36 41
Maintenance
-25 -30
-13 -22
55 60
14.58 15.85
65 60
17.12 15.85
46 50
WA500-6H – VEAM430100