Komatsu PC300LC-8 Operation & Maintenance Manual page 289

MAINTENANCE PROCEDURE
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.
The coolant is already diluted with distilled water. (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 machine on level ground, then stop the engine.
2. Check that the cooling water temperature has gone down
enough to make it possible to touch the radiator cap surface by
hand, then turn radiator cap (2) slowly until it contacts the
stopper to release the pressure.
3. Following this, push radiator cap (2), turn it until it contacts the
stopper, then remove it.
4. Remove the cover (3), then set the container under drain valve
(4) to catch the coolant mixture.
Open drain valve (4) at the bottom of the radiator and drain the
coolant.
5. After draining the antifreeze solution, close drain valve (4),
then fill with clean water. After the radiator is filled with water,
start and run the engine at low idle speed. After the water
temperature rises above 90°C (194°F), run the engine for
about 10 minutes.
6. Stop the engine and open drain valve (4) to drain the water.
7. After draining the water, clean the radiator with detergent.
For the cleaning method, follow the instruction of detergent.
8. Close drain valve (4).
9. Install the cover (3).
10. Add Supercoolant through the water filler up to the bottom of the filler port.
For details of the Supercoolant density, see the COOLANT DENSITY TABLE.
11. Run the engine at low idling for 5 minutes to remove the air from the water, then run at high idling for 5 minutes.
(Leave radiator cap (2) removed when doing this.)
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WARNING
MAINTENANCE