Komatsu WA70-7, Руководство по эксплуатации и обслуживанию

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5.8 Maintenance procedure
Maintenance Maintenance every 2000 service hours
WA70-7 – VENAM02003
5-69
Draining the coolant
1. Switch off the engine and let it cool down.
2. Slowly turn the radiator cap (arrow) to the first stop and let
the pressure escape. Then push the cap down and continue
turning until it can be removed.
3. Install a hose to the outlet (1) of the drain valve and route the
end of the hose to the drain tray.
4. Open the drain valve and drain the coolant.
5. Close the drain valve.
Cleaning the cooling system
NOTICE
Fill the cooling system slowly. Otherwise the enclosed air may
not be able to escape fully. After filling, wait for three more min-
utes and top off fluid if required.
1. Slowly fill the cooling system with the cleaning agent.
(Observe the instructions by the manufacturer of the clean-
ing agent.)
2. Let the engine run with an open radiator cap for 5 minutes at
a coolant temperature of about 80 °C.
3. After cleaning, switch off the engine and open the drain
valve (1) to drain the cooling system completely.
Close the drain valve (1), and fill the cooling system slowly
with clean water.
4. Let the engine run for five minutes at a coolant temperature
of about 80 °C.
5. Drain the cooling system again. If the drained water is not
clean yet, flush the cooling system again until the draining
water is clean.
6. Close the drain valve.
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