Komatsu WA100M-7, Operation And Maintenance Manual

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5.8 Maintenance procedure
Corrective maintenance Maintenance
5-34
WA80M-7, WA100M-7 – VENAM03001
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 turn-
ing 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 minutes
and top off fluid if required.
1. Slowly fill the cooling system with tap water.
2. Once the radiator has been filled with water, start the engine.
3. Press the accelerator pedal down slightly and allow the
engine to run at moderate engine revs for about 5 minutes,
without load.
4. After cleaning, switch off the engine and open the drain valve
(1) to drain the cooling system completely.
If the drained water is not clean yet, flush the cooling system
again until the draining water is clean.
5. Close the drain valve (1) again and slowly fill the cooling sys-
tem with clean, amine-free coolant.
1