Komatsu WA380-6 Operation & Maintenance Manual page 259

SERVICE PROCEDURE
Coolant density table
° C
Minimum Temp
° F
Concentration (%)
COOLANT is toxic. When open the drain valve, be careful not to get coolant 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 when handling the coolant containing COOLANT that has been drained during repair of radiator,
please contact your Komatsu distributor or request a specialist company to carry out the operation. COOLANT is toxic. Do not
let it flow into drainage ditches or spray it onto the ground surface.
COOLANT is already diluted with distilled water, so it is not flammable. (For details of the distilled water, see
"COOLANT AND WATER FOR DILUTION (PAGE 4-5)"). Check the density with a COOLANT tester.
Prepare a container whose capacity is larger than the specified coolant volume to catch drained coolant.
Prepare a hose to use when filling with coolant.
1. Stop the engine.
2. Check that the coolant temperature has gone down enough to
make it possible to touch the radiator cap surface by hand,
then turn radiator cap (1) slowly until it contacts the stopper to
release the pressure.
3. Following this, push radiator cap (1), turn it until it contacts the
stopper, then remove it.
4. Set a container in position to catch the coolant, then open drain
valve (2) at the left side of the fuel tank.
5. After draining the water, close drain valve (2) and fill with city
water.
6. When the radiator is full, start the engine, and run it at low idle.
Keep the engine running at low idle for 10 minutes until the
coolant temperature reaches more than 90°C (194°F).
7. Stop the engine, open drain valve (2), drain the water, then
tighten the drain valve again.
8. After draining the water, clean the cooling system with cleaning agent.
For the cleaning method, see the instructions for the cleaning agent.
9. Add coolant through the water filler port up to the mouth of the port. For details of the COOLANT density, see
"COOLANT DENSITY TABLE".
10. To bleed the air from the cooling system, run the engine at low idle for 5 minutes, and for a further 5 minutes at
high idle. (When doing this, leave the radiator cap off.)
4 - 22
Above -10 -15 -20
Above 14 5 -4
30 36 41
-25 -30
-13 -22
46 50
WARNING
MAINTENANCE
-35 -40 -45
-31 -40 -49
54 58 61
-50
-58
64