MAINTENANCE EVERY 500 OPERATING HOURS 30. MAINTENANCE EVERY 500 OPERATING HOURS All maintenance operations to be performed after 10, 50, 100 and 250 hours of operation also fall in- to this maintenance category. 30.1 CHANGING THE FUEL FILTER AND FILTER ELEMENT Danger of fire! Fuel may ignite on hot surfaces! Only change the filter elements if the engine has suffi- ciently cooled down. Stay away with open fire or sparks while handling with fuel. Do not smoke. 1 - For maintenance operations, park and secure machine as described in chapter "22.1 Preparing the Machine for Main- tenance". 2 - Clean the area around the fuel filter (1).
3 - Unscrew the filter element counterclockwise with the filter screwdriver. 4 - Clean the filter head. 5 - Fill up the new filter element with clean fuel. 6 - Lubricate the sealing faces of the filter element lightly with engine oil. 7 - During reassembly, re-tighten the filter element manually, until the seal is fitting. Then re-tighten the filter element. (Consider the specifications of the filter manufacturer on the filter). 8 - Then purge the fuel system. (see section "30.1.1 Bleeding the Fuel System"). 9 - Start the engine and check for leaks. 1 75_251 167