Servicing and maintenance works Fuel system z Open constant-pressure valve in the crankcase/ fuel stopcock in the filter housing. z Start engine. Turn over the engine with starter (max. 20 Sec.) until bubble-free fuel emerges at the constant-pressure valve in the crankcase/fil- ter housing. z Shut down engine Screw in ventilation screws (tightening torque 25-5 Nm) and constant-pressure valve. z Start engine. Bring engine control to the start position and start. Check for leaks after starting the engine. 46 © 2009 Change after maintenance interval, loss of power, or annually. z Switch off the engine or switch over to the other filter in case of switchable filter.
z Shut off the fuel supply to the engine (with high- level tank). z Loosen screws diagonally. z Remove cover. z Remove spring cassette. z Change filter cartridge z Place spring cassette on the filter cartridge. z Check the cover gasket for correct fit and dam- age (change if necessary). z Tighten cover with screws diagonally (tightening torque 6Nm). z Check for leaks after starting the engine. z Vent the fuel system. level tank). z Place suitable collecting containers underneath. z Loosen vent screws slightly. z Open the drain cock and drain liquid. To open, the drain cock must be pressed lightly and turned.
z Shut down engine z Position fuel collecting vessel below the con- stant-pressure valve in the crankcase/filter hous- ing. Change the fuel pre-filter insert z Close the drain cock. z Tighten vent screw. z Vent the fuel system. Vent the fuel system A warning system (lamp/horn) should be in- stalled via the electric connections. If the warning system is triggered, immediate maintenance is required. z Switch off the engine or switch over to the other filter in case of switchable filter.
z Shut off the fuel supply to the engine (with high- Clean/change/vent the fuel pre-filter Cleaning/purging, draining of water 1 Venting screw 2 Cover 3 Screw 4 Spring cassette 5 Filter insert 6 Water collection vessel 7 Electrical connection 8 Water drain tap 6