Xylem Flygt 5520, Installation, Operation And Maintenance Manual

Page: 42 / 54

6. Remove the expeller.
Install the impeller
1. Prepare the shaft:
a) Make sure that the end of the shaft is free from burrs.
Polish off any flaws with a fine emery cloth.
b) Grease the shaft end and the inside of the impeller hub.
NOTICE:
• Do not grease the conical part of the shaft.
• Surplus grease can cause the impeller to become loose. Remove surplus grease
from conical and/or cylindrical surfaces of shafts and/or sleeves.
2. Check the clearance:
a) Place the wearing cover on the impeller.
b) Measure the distance between the outside of the impeller hub and the inside of the
wearing cover hole.
If the clearance exceeds 3.0 mm (0.12 in.), the wearing cover must be replaced.
3. Mount the impeller:
a) Fit the sleeve onto the shaft.
b) Fit the expeller and the wearing cover onto the shaft.
Use a rubber mallet in order to knock the wearing cover in to place.
c) Press the impeller onto to the shaft.
4. Fasten the impeller:
a) Fit the washer on the impeller screw.
b) Fit the impeller screw.
c) Tighten the impeller screw.
Tightening torque: 60 Nm (42 ft-lbs.)
d) Check that the impeller can rotate freely.
5. Mount the pump housing:
a) Make sure the ring is seated against the oil housing.
b) Fit the pump housing.
c) Fit and tighten the lubricated screws.
For tightening torque, see Torque values (page 34).
6. Check that the impeller can rotate freely.
Make sure that there is no friction between the impeller and the wear ring and that the
clearance is 0.3 mm (0.01in.).
Maintenance
40 Flygt 5520 Installation, Operation, and Maintenance Manual