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6 Maintenance <br />a) Polish off any flaws with a fine emery cloth. <br />The end of the shaft must be clean and free from burrs. <br />b) Coat the inner conic, the outer cylindrical surfaces, and the thread of the conical <br />sleeve with a thin layer of grease. <br />The proper lubrication is grease for bearings, for example Exxon Mobil Unirex N3, <br />Mobil Mobilith SHC 220 or equivalent. <br />NOTICE.: <br />Surplus grease can cause the impeller to become loose. Remove surplus grease <br />from conical and/or cylindrical surfaces of shafts and/or sleeves. <br />a <br />N <br />QmmI <br />\ O <br />2. Mount the impeller: <br />a) Fit the conical sleeve onto the shaft. <br />b) Lubricate the impeller screw threads and contact surface. <br />Ensure that all parts are. clean. <br />c) Fit the washer on the lubricated impeller screw. <br />d) Press the impeller onto the shaft with the impeller screw. <br />NOTICE: <br />The impeller may get jammed against the oil housing bottom. Pull out the impeller <br />a couple of millimeters, when mounting a C impeller with the pressure class LT. <br />3. Tighten the impeller screw. <br />If applicable, use the rod. <br />"Tightening torque: 65 Nm (48 ft-lbs) <br />Tighten a further 1 /8 turn, 45' aftertightening to the correct torque. <br />Flygt 3102 Installation, Operation, and Maintenance Manual 49 <br />