Xylem Flygt 3201, Installation Operation & Maintenance, Page: 39 / 48

3. Tighten the impeller or propeller screw.
Tightening torque, see Torque values (page 32).
4. Check that the impeller is firmly seated and can be easily rotated by hand.
5. Before assembling the pump housing and the drive unit end, check the following:
a) Check the O-ring and fit it in place.
b) Check the orientation of the pump housing.
6. Assemble the pump.
Tightening torque, see Torque values (page 32).
More extensive repairs require special tools and should be completed by an Xylem
authorized service technician.
Adjust the lower wear protection
For the HS version, the lower wear protection may need adjustment. The clearance
between the impeller and the wear protection should be minimal. The clearance is
adjusted with the sleeve screws.
1. Check that the impeller can easily be rotated by hand.
2. Tighten the sleeve screws evenly until the wear protection is flush against the impeller.
3. Back off the sleeve screws a quarter turn.
4. Tighten the lock nuts evenly all around.
5. Fit and tighten the cap nuts.
6. Check that the impeller can easily be rotated by hand.
For the pump to perform at maximum capacity, the impeller must be adjusted regularly.
More extensive repairs require special tools and should be carried out by an Xylem
authorized service technician.
Service the pump
Regular inspection and service of the pump ensures more reliable operation.
Type of service Inspection interval
Intermediate service Every 2 years /8000 hours
(For standard sewage applications with FLS in use and a
pumped liquid temperature of 40ºC (104ºF ) or less.)
Major service in an authorized service shop Every 20,000 hours
(May vary considerably depending on operating
conditions.)
Intermediate service
Maintenance
Flygt 3201 Installation, Operation, and Maintenance Manual 37