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MAINTENANCE
Clean the inside of the cooling system, change the coolant and replace the corrosion resistor according to the
table below.
Antifreeze coolant
Komatsu supercoolant
(AF-NAC)
Permanent type antifreeze
(All-season type, *)
*: Permanent type antifreeze shall meet the requirements of ASTM D3306-03.
Stop the machine on level ground when cleaning or changing the coolant.
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.
Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
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.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mix-
ing table given below.
It is actually better to estimate and temperature about 10°C lower when deciding the mixing ratio.
The mixing ratio depends on the ambient temperature, but it should always be a minimum of 30% by volume (anti-
freeze/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
Amount of antifreeze
Amount of water
Proportion by volume
Interval of cleaning inside of cooling system
and changeing antifreeze coolant
Every two years or every 4000 hours which-
ever comes first
Every year (autumn) or every 2000 hours
whichever comes first
°C
- 10
- 15
liters
31.2
37.4
liters
72.8
66.6
%
30
36
- 20
- 25
- 30
42.6
47.8
52.0
61.4
56.2
52.0
41
46
50
MAINTENANCE PROCEDURE
Replacing corrosion resistor
unnecessary
Every 1000 hours
and when cleaning the inside
of the cooling system
and when changing coolant
-35
-40
56.2
60.3
47.8
43.7
54
58
4-25
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