24. SERVICE PROCEDURE 24.7 EVERY 500 HOURS SERVICE Maintenance for every 50, 100 and 250 hours service should be carried out at the same time. 24.7.1 REPLACE FUEL FILTER CARTRIDGE ¤ WARNING Engine is at high temperature immediately after the machine has been operated. Wait for engine to cool down before replacing the filter. Do not bring fire or sparks near the fuel. Prepare a filter wrench and a container to catch the fuel. 1. Set the container to catch the fuel under the filter cartridge. 2. Using a filter wrench, turn filter cartridge 1 counterclockwise to remove it. 3.
Clean the filter holder, fill a new filter cartridge with clean fuel, coat the packing surface with engine oil, then install it to the filter holder. 4. When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it up 1/2 to 3/4 of a turn. If the filter cartridge is tightened too far, the packing will be damaged and this will lead to leakage of fuel. If the filter cartridge is too loose, fuel will also leak from the packing, so always tighten to the correct amount. AM091700 5. After replacing the fuel filter cartridge, bleed the air from the system. Bleed the air as follows. 6.
Fill the fuel tank with fuel (to the position where the float is at the maximum position). 7. After replacing filter cartridge 1 , loosen air bleed plug 2 . 8. Loosen the knob of feed pump 3 , operate it up and down, and continue until no more bubbles come out with the fuel from air bleed plug 2 . 9. Tighten air bleed plug 2 . Use a genuine Komatsu filter cartridge. After replacing the filter cartridge, start the engine, and check that there is no leakage of fuel from the filter seal surface. 3-57