Komatsu PC138USLC Operation & Maintenance Manual page 283

MAINTENANCE PROCEDURE
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 mixing
table given below.
It is actually better to estimate and temperature about 10°C (18°F) 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
(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
Volume ratio (%)
Antifreeze is flammable, so keep it away from flame.
Antifreeze is toxic. When open the drain valve, be careful not to get water containing antifreeze on you. If it gets in your eyes,
flush your eyes with large amount of fresh water and see a doctor at once.
When changing the coolant or draining the coolant from the radiator before carrying out repairs, ask a specialist company to
handle any coolant containing antifreeze, or contact your Komatsu distributor. Antifreeze is toxic, so never pour it into
drainage water ditches or drain it onto the ground surface.
Use antifreeze and appropriate water for diluting. (for details, see "COOLANT AND WATER FOR DILUTION (PAGE
4-5)")
We recommend use of an antifreeze density gauge to control the mixing proportions.
Prepare a container whose capacity is larger than the specified coolant volume to catch drained coolant.
Prepare a hose to supply antifreeze coolant and water.
Prepare a container with a capacity of at least 15 liter (3.96 US gal) to catch the coolant.
4 - 22
° C
Above-10 -15
° F
Above14
liter 3.7 4.3
US gal 0.98 1.14
liter 8.7 8.1
US gal 2.30 2.14
30
-20 -25
5 -4 -13
5.0 5.6
1.32 1.48
7.4 6.8
1.96 1.80
35 40 45
WARNING
MAINTENANCE
-30
-22
6.2
1.64
6.2
1.64
50