24. SERVICE PROCEDURE 24.5 EVERY 500 HOURS SERVICE Maintenance for every 250 hours service should be carried out at the same time. 24.5.1 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. When bleeding the air, be carefull not to let the fuel overflow. It may cause a fire. Prepare a filter wrench and a container to catch the fuel. 1. Set the container to catch the fuel under the filter cartridge. 2. Close valve 1 . 3. Remove drain plug P at the bottom of the filter, and drain the oil.
After draining the oil, tighten drain plug P again. 4. Using a filter wrench, turn filter cartridge 2 counterclockwise to remove it. 5. 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. 6. When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it up 3/4 to 1 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. 7. Open valve 1 and loosen air bleeding plug 3 .
8. Loosen the knob of feed pump 4 and move the pump up and down to draw off fuel until air ceases to come out of plug 3 . 3-53