Komatsu PC15MRX-1 Operation And Maintenance Manual page 165

MAINTENANCE
4. Open the hood (3) at the rear of the machine.
5. Set container to catch the coolant under drain valve (4).
6. Open drain valve (4) to drain the water.
Remove drain plug to drain the water.
7. After drain the water, close drain valve (4) and drain plug,
and add water. When the radiator is full, start the engine
and run at low idling. Raise the water temperature to
above 90°C and run for approx. 10 minutes.
8. Stop the engine, then open drain valve (4) and remove
the drain plug to drain the water.
9. After draining the water, clean the radiator with detergent.
For the cleaning method, follow the instruction of detergent.
10. Close drain valve (4), wrap the drain plug with sealing tape, then close it.
11. Decide the proportions of antifreeze and water according to the table for the mixing rate of water and anti-
freeze.
12. After the engine warming up, check that each gauge and caution lamp are in normal condition. If any abnor-
mality is found, carry out adjustment or repairs.
Operate the machine under a light load until the engine water temperature gauge points to the white range
(monitor panel spec.) or the green range(gauge panel spec.).
To remove the air in the cooling water, run the engine for 5 minutes at low idling, then for another 5 minutes
at high idling. (While doing this, leave the radiator cap removed)
MAINTENANCE PROCEDURE
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