SERVICE PROCEDURE MAINTENANCE
4-24
WARNING
Antifreeze is flammable, so keep it away from flame.
Antifreeze is toxic. When removing the drain plug, be careful not to get water containing antifreeze on
you. If it gets in your eyes, flush your eyes with large quantities of fresh water and see a doctor at once.
Use city water for the cooling water.
If river water, well water or other such water supply must be used, contact your Komatsu distributor.
We recommend use of an antifreeze density gauge to control the mixing proportions.
Prepare a container having capacity of at least 44 liters (11.62US gal)to receive the antifreeze solution.
1. Stop the engine.
2. Turn radiator cap(1) slowly to remove it.
3. Place a container to receive the antifreeze solution under
drain valve(2) on the underside of the radiator and drain
plug(3) on the side of the cylinder block.
Open drain valve(2) and remove drain plug(3) to drain
the antifreeze solution.
4. After draining the antifreeze solution, close drain valve(2)
and tighten drain plug(3), then pour city water. After the
radiator is filled with the water, start and run the engine at
low idling speed. After the water temperature rises above
90°C, run the engine for about 10 minutes.
5. Stop the engine and open drain valve(2) and remove drain plug(3) to drain the water.
6. After draining the water, clean the cooling system with cleaning agent.
For the cleaning method, see the instructions for the cleaning agent.
7. Close drain valve(2). Wind seal tapes onto drain plug(3), then tighten it.
8. Add water through the water filler up to the filler port.
9. To remove the air in the cooling water, run for five minutes at low idling, then for another five minutes at high
idling.
When doing this, leave radiator cap (2) off.
10. Drain the cooling water inside sub-tank(4), clean the
inside of the sub-tank, then fill again with cooling water to
a point midway betwee the FULL and LOW marks.
11. Stop the engine and tighten the cap. Check the coolant
level and add water if necessary.
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