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MAINTENANCE
4. Check that the cooling water temperature has gone down
enough to make it possible to touch the radiator cap sur-
face by hand, then turn radiator cap (3) slowly until it con-
tacts the stopper to release the pressure.
5. Following this, push radiator cap (3), turn it until it contacts
the stopper, then remove it.
6. Remove drain valve cover (4) on the radiator side and
drain valve cover (5) on the engine side.
7. Set containers to catch the drained coolant under drain
valve (6) on the radiator side and drain valve (7) on the
engine site.
Open drain valves (6) and (7), and drain the coolant.
8. After draining the antifreeze solution, close drain valve (6),
(7), 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.
9. Stop the engine and open drain valves (6), (7) to drain the
water.
10. After draining the water, clean the radiator with detergent.
For the cleaning method, follow the instruction of deter-
gent.
11. Close drain valves (6), (7).
12. Install the covers (4) and (5).
13. Replace the corrosion resistor, and open valve (1).(Only machines equipped with corrosion resistor)
For details of replacement of the corrosion resistor cartridge, see "REPLACE CORROSION RESISTOR CAR-
TRIDGE (4-74)".
14. 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.
15. Run the engine at low idling for 5 minutes to remove the air from the water, then run at high idling for 5 min-
utes. ( Leave radiator cap (3) removed when doing this. )
MAINTENANCE PROCEDURE
4-29
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