Komatsu 4D98 Series Shop Manual page 18

1. General
(3) Cooling water
Use clean drinkable water (tap water or rainwater) as the cooling water.
-
[NOTICE]
Always add antirust or antifreeze in the cooling water.
Especially in cold weather, be sure to add antifreeze to prevent freezing. Since scale
or rust will be generated in the water piping when only clear water is used, the cool-
ing performance is worsened. In a cold weather, the cooling water may be expanded
by freezing to cause damage to the cooling system parts.
1)
2)
Rust preventive agent
Be sure to add the rust preventive agent
to the cooling water. However, do not
use it in cold weather because freezing
will occur.
When you use a rust preventive agent
sold on the market, be sure to follow the
mixing rate designated by the manufac-
turer.
Replace the rust preventive agent once
a year.
Antifreeze
In cold weather, be sure to add the anti-
freeze to prevent freezing.
If you use antifreeze, addition of the rust
preventive agent is unnecessary. Anti-
freeze can be used throughout the year.
The mixing rate should be between 30%
and 55%.
Lowest atmospheric
temperature "C
j -45;; ( -20 1 -25
I
Mixing rate %
1 30 / 35 / 40
[NOTICE]
Excessive addition of antifreeze will
worsen engine cooling.
Always observe the mixing rate speci-
fied by the manufacturer for each am-
bien t temperature.
When you use an antifreeze sold on the market, be
sure to follow the mixing rate designated by the
manufacturer.
Replace the antifreeze once a year.
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