Xylem Flygt 2190 Installation, Operation And Maintenance Manual page 53

3. Grease the threads of the impeller screw and the washer.
4. Check that the impeller screw is clean and easy to screw into the shaft end.
5. Assemble the conical sleeve in the impeller.
6. Assemble the impeller with the conical sleeve onto the shaft.
7. Press the impeller against the seal housing cover. Turn the adjustment screw
8. Fasten the impeller:
Flygt 2190, 2201 Installation, Operation, and Maintenance Manual
WS001759A
The proper lubrication of the screw and washer is lubricating grease for assembly of
bolts etc., for example, Kluber ALTEMP Q NB 50 or equivalent.
This is to prevent the shaft from rotating with the impeller screw.
Make sure that the conical sleeve bottoms in the impeller.
clockwise until the clearance between the impeller and the seal housing cover is 0.5–
0.7 mm (0.02–0.03 in).
a) Place the washer on the impeller screw.
b) Lock the impeller to prevent rotation.
Use pliers, a screwdriver, or similar.
c) Tighten the impeller screw.
Tightening torque: 76 Nm (57 ft-lb)
d) Tighten a further 1/8 turn, 45°.
The screw will be loaded to its yield point and the load capacity of the joint will be
higher.
6 Maintenance
51