Komatsu PC350LC-8, Operation & Maintenance Manual

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MAINTENANCE PROCEDURE
MAINTENANCE
4-30
3. Check that the cooling water temperature has gone down
enough to make it possible to touch the radiator cap sur-
face by hand, then turn radiator cap (2) slowly until it con-
tacts the stopper to release the pressure.
4. Following this, push radiator cap (2), turn it until it contacts
the stopper, then remove it.
5. 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.
6. 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, run the engine for
about 10 minutes.
7. Stop the engine and open drain valve (4) to drain the water.
8. After draining the water, clean the radiator with detergent.
For the cleaning method, follow the instruction of deter-
gent.
9. Close drain valve (4).
10. Install the cover (3).
11. Replace the corrosion resistor, then turn the valve (1) fully to the left to open it. (Only machines equipped with
corrosion resistor)
For details of replacement of the corrosion resistor cartridge, see “REPLACE CORROSION RESISTOR CAR-
TRIDGE (4-74)“.
12. Add coolant mixed with antifreeze until it overflows from the water filler.
Decide the proportions of antifreeze and water according to the table for the mixing rate of water and anti-
freeze.
13. Run the engine at low idling for 5 minutes to remove the air from the water, then run at high idling for 5 min-
utes. (Leave radiator cap (2) removed when doing this.)