Komatsu PC45MR-30403, Operation And Maintenance Manual

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8.
Place a container to catch the coolant under the drain
hose installed to the drain valve (6).
REMARK
For the machine with air conditioner, the drain valve (6) is
located at the position shown in the figure.
9.
Open the drain valve (6) to drain the coolant.
10. After draining the coolant, close the drain valve (6).
11. Fill the radiator with tap water.
Add tap water until it fills the radiator.
12. Start the engine and run it at low idle.
Continue running the engine at low idle for 10 minutes.
13. Stop the engine.
14. Open the drain valve (6) to drain the tap water.
15. After draining the tap water, close the drain valve (6).
16. Add coolant through the water filler port up to the mouth of the port.
For the coolant density, see “Coolant density table”.
17. Run the engine at low idle for 5 minutes to remove the air from the coolant, then run at high idle for a further
5 minutes.
Keep the radiator cap (5) removed during the above operations.
MAINTENANCE MAINTENANCE PROCEDURE
4-29