Use a 12 mm hexagon bit adapter (Allen socket) with a 100 mm (4 in) extension.
15. Fasten the impeller:
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.
e) Check that both the upper and lower impeller can rotate easily.
16. Check that the impeller can rotate freely.
If not, then the adjustment screw and the conical sleeve have not been aligned, and
the shaft may have been displaced relative to the main bearing.
17. Mount the strainer and the nuts.
Tightening torque: 76 Nm (57 ft-lb)
6 Maintenance
Flygt 2190, 2201 Installation, Operation, and Maintenance Manual 49
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