MAINTENANCE PROCEDURE MAINTENANCE Antifreeze is flammable, so keep it away from flame. Antifreeze is toxic. When removing the drain plug, be careful not to get water containing antifreeze on you. If it gets in your eyes, flush your eyes with large quantities of fresh water and see a doctor at once. Use city water for the cooling water. If river water, well water or other such water supply must be used, contact your Komatsu distributor. We recommend use of an antifreeze density gauge to control the mixing proportions. Prepare a container to catch drained coolant: 6.5 liters (1.72 US gal) capacity. Prepare a water inlet hose. 1. Open the cover at the right side of the machine. 2.
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 (1) slowly until it contacts the stopper to release the pressure. 3. Following this, push radiator cap (1), turn it until it contacts the stopper, then remove it. 4. Remove cover (2) at the rear right under the machine. 5. Set container to catch the coolant under drain valve (3) and drain plug of cylinder block. 6. Open drain valve (3) to drain the water. Remove drain plug to drain the water. 7. After you drain the water, close drain valve (3), install the drain plug, and add water.
When the radiator is full, start the engine and run it at low idle to raise the water tempera- ture above 90єC (194єF) and run the engine for approx. 10 minutes. 8. Stop the engine, then open drain valve (3) and remove the drain plug to drain the water. 9. After draining the water, clean the radiator with detergent. For the cleaning method, follow the instruction of detergent. 10.Close drain valve (3), wrap the drain plug with sealing tape, then close it. 11.Decide the proportions of antifreeze and water according to the table for the mixing rate of water and anti- freeze. 12.After the engine warming up, check that each gauge and caution lamp are in normal condition.
If any abnormal- ity is found, carry out adjustment or repairs. Operate the machine under a light load until the engine water temperature gauge (2) points to the white range (monitor panel spec.) or the green range (gauge panel spec.). To remove the air in the cooling water, run the engine for 5 minutes at low idling, then for another 5 minutes at high idling. (While doing this, leave the radiator cap removed) 4-22 WARNING