Xylem Flygt 2620.172 Service And Repair Instructions page 58

4 Maintenance
3. Grease the threads of the screw and the washer.
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.
4. Check that the impeller screw is clean and easy to screw into the shaft end.
This is to prevent the shaft from rotating with the impeller screw.
5. Assemble the conical sleeve in the impeller.
Make sure that the conical sleeve bottoms in the impeller.
6. Assemble the impeller with the conical sleeve onto the shaft.
7. Fasten the impeller:
a) Place the washer on the impeller screw.
b) Lock the impeller to prevent rotation.
c) Tighten the impeller screw.
d) Tighten a further 1/8 turn, 45°.
e) Check that the impeller can rotate freely.
56
Use pliers, a screwdriver, or similar.
Tightening torque: 22 Nm (16.2 ft-lb)
The screw will be loaded to its yield point and the load capacity of the joint will be
higher.
2620.172/.281 Service and Repair Instructions