MAINTENANCE 3. Open the drain valve (located on the left side of the machine, on the inside of the frame, above the fuel tank) on the engine coolant inlet tube coming from the oil cooler off the bottom of the radiator. 4. Allow the system to completely drain into a suitable container. (MAKE SURE the drain outlets do not plug up during draining.) 5. Close the drain valve. REMARKS: Always replace the coolant corrosion resistor filter after cleaning and flushing the cooling system and installing new coolant. See “24.7 EVERY 500 HOURS SERVICE” on page 3-54. FLUSHING THE COOLING SYSTEM 6. Refill the system with water only. 7.
Then run the engine at low idle and open the drain valve (described in step 3). 8. With the engine is running continue adding water in the top of the radiator, so that water is passing through the cooling system for about 10 minutes. 9. After flushing the system with water, close the drain valve. 10. Now clean the system with a flushing agent. For details of cleaning see instructions given with the cleaning agent. NOTE: If the system shows mineral build-up, scale rust or oil, use a heavy duty radiator cleaner. NOTE: Do not use a caustic cleaners in the cooling system. Aluminum components will be damaged. 11.
After cleaning with the flushing agent, refill the system with fresh water and repeat step 7 and 8 until clean water comes out the drain valve. 12. Now turn the engine OFF,drain all the water out, and then close the drain valve. FILLING THE COOLING SYSTEM 13. Prepare the proper coolant for your environment as specified. See "20.3 COOLANT SPECIFICATIONS" on page 3-14. 14. Fill the system with the new coolant, leave the radiator cap off and run the engine for 5 minutes at low idle and then for 5 minutes at high idle to eliminate any trapped air in the system. 15. Turn the engine OFF and wait 3 minutes then add more 3-67 WA320-3MC