Komatsu Utility 69001, Руководство по эксплуатации и техническому обслуживанию

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SERVICE PROCEDURE
MAINTENANCE
4-26
2. Turn radiator cap (1) slowly until it hits the stopper and by
so doing, relieving the internal pressure.
3. Turn radiator cap (1) until it hits the next stopper, while
depressing it. Keep turning the radiator cap (1) until it hits
the last stopper.
4. Put containers to catch the coolant under drain valve (2) at
the bottom of the radiator and under drain valve (3) at the
side of the cylinder block.
Open drain valve (2) and drain valve (3), and drain the
water.
5. After draining the antifreeze solution, close drain valve (2),
(3), then fill with clean water. After the radiator is filled with
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.
6. Stop the engine and open drain valve (2), (3) to drain the water.
7. After draining the water, clean the cooling system with cleaning agent.
For the cleaning method, see the instructions for the cleaning agent.
8. Replace the corrosion resistor, then open 2 valves.
For details of the procedure for replacing the corrosion resistor, see “REPLACE CORROSION RESISTOR
CARTRIDGE (4-64)“.
9. Close drain valve (2), (3).
10. 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.
11. To remove air in the cooling system, run the engine for 5 minutes at low idle, then for 5 minutes at high idle.
(While doing this, leave the radiator cap removed.)