24. SERVICE PROCEDURE Prepare a container to catch drained coolant: Min 32 ¶ (8.5 US gal, 7.1 UK gal) capacity. 1. If a corrosion resistor cartridge is installed, close valves 1 . 2. Turn radiator cap 2 slowly to remove it. 3. Remove the undercover, then set a container to catch the coolant under drain valves 3 and 4 . Open drain valve 3 at the bottom of the radiator and open drain valve 4 of cylinder block to drain the water. AM091190 4. After draining the water, close drain valves 3 and 4 and add water. When the radiator is full, start the engine and run at low idling. 5. Open drain valves 3 and 4 , run the engine at low idling, and flush water through the system for 10 minutes.
When doing this, adjust the speed of filling and draining the water so that the radiator is always full. While flushing water through the system, watch carefully that the water inlet hose does not come out of the radiator water filler. 6. After flushing, stop the engine, open drain valves 3 and 4 , then close it again after all the water has drained out. 7. After draining the water, clean with a flushing agent. We recommend use of a Komatsu genuine cleaning agent. For details of the cleaning method, see the instructions given with the cleaning agent. 8. After cleaning, open drain valves 3 and 4 to drain all the cooling water, then close them and fill slowly with clean water. 9.
When the water comes up to near the water filler port, open drain valves 3 and 4 , run the engine at low idling, and continue to run water through the system until clean colorless water comes out. When doing this, adjust the speed of filling and draining the water so that the radiator is always full. 3-28