Komatsu GD555-5 Operation & Maintenance Manual page 267

SERVICE PROCEDURE
Coolant is toxic. When open the drain valve, be careful not to get coolant on you.
If it gets in your eyes, flush your eyes with large amount of fresh water and see a doctor at once.
When changing the coolant or when handling the cooling water containing coolant that has been drained during repair of
radiator, please contact your Komatsu distributor or request a specialist company to carry out the operation. Coolant is toxic.
Do not let it flow into drainage ditches or spray it onto the ground surface.
COOLANT is already diluted with distilled water, so it is not flammable. (For details of the distilled water, see
"COOLANT AND WATER FOR DILUTION (PAGE 4-5)"). Check the density with a COOLANT tester.
Prepare a hose to use when filling with coolant.
Prepare a container to catch drained coolant minimum 40 liters (10.57 US gal) capacity.
1. Stop the machine on level ground, then stop the engine.
2. Remove bolts (1) (2 pieces) to take cover (2) off.
3. Check that the cooling water temperature has gone down
enough to make it possible to touch the radiator cap surface by
hand, then turn radiator cap (3) slowly until it contacts the
stopper to release the pressure.
4. Following this, push radiator cap (3), turn it until it contacts the
stopper, then remove it.
5. Prepare a container to catch the coolant and open drain valve
(4) at the left of the fuel tank to drain the coolant.
6. After draining the water, close drain valve (4) and fill with city
water.
7. When the radiator is full, start the engine, and run it at low idle.
Keep the engine running at low idle for 10 minutes until the
coolant temperature reaches more than 90°C (194°F).
8. Stop the engine, open drain valve (4), and drain the water.
9. After draining the coolant, clean it with detergent liquid.
For the cleaning method, follow the instruction for the
detergent liquid.
10. Close drain valve (4).
11. Add coolant through the water filler port up to the mouth of the
port. For details of the coolant density, see "COOLANT
DENSITY TABLE".
12. To remove air in the coolant, run the engine for 5 minutes at low
idle and for another 5 minutes at high idle.
(While running the engine, leave the water filler cap removed.)
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WARNING
MAINTENANCE