Kubota XN12-8 Operation Manual page 138

Maintenance
Every 1000h
3. Place a tray beneath the water drainage
plug (4) to collect the used coolant and
then loosen the water drainage plug (4) to
drain the coolant.
4. Tighten the water drainage plug (4).
5. Add running water through the water filler
port into the radiator, till the water level
reaches the top of filler port. Add the water
slowly and easily to prevent the ingress of
air into radiator.
6. Install the radiator cap (3).
7. Start the engine and run the engine at a
speed slightly higher than the low idling
speed. Heat up the water temperature to at
least 90℃, open the thermostat, and then
run the engine for approximately 10min.
8. Stop the engine, wait for the coolant to
cool down, and then take out the drainage
plug (4) to drain the water.
9. After water drainage, clean the cooling
system by detergent. Use the detergent as
per the attached operation instructions of
the detergent.
10. Repeat steps 4~8 to clean the cooling
system.
11. Tighten the water drainage plug (4).
12. Add new coolant (Mixture of antifreeze
and running water) through filler port to
the radiator, till the radiator is full. Add the
coolant slowly and easily.
13. Install the radiator cap (3).
14. Warm up the engine. Use instruments to
check the cooling system for presence of
abnormality.
15. Increase the water temperature to at least
90℃. Then, open the thermostat and run
the engine for approximately 10min.
16. Stop the engine, wait for the coolant to
cool down, and then check the coolant
level in the radiator.
17. Install the radiator cap (3).
18. Clean the inside of water tank (1) and add
coolant, till the water level reaches upper
limit (H).
19. If the coolant is replaced, re-check the
coolant level after the operations of
machine.
Once the machine starts operations, the
coolant is distributed to the whole system
so that the coolant level drops.
Add the coolant to compensate the
consumed coolant.
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