BW SOLAR Waterboy, Installation Manual

Page: 24 / 27

24
Fitting the new pump assembly
The installation of the new rotor and stator is simply the reverse of the disassembly.
NOTE: always use a medium strength locking compound to secure the body and top end bolts
from vibrating loose during operation.
Always replace the rotor, stator and flexi-shaft at the same time.
The grub screws in the flexi-shaft are to help prevent the rotor unthreading in the event that the
pump is run backwards. If the pump is run with the correct rotation, the rotor self-tightens and the
grub screws are not necessary. For that reason, replacement rotor/stator assemblies come without
grub screws. If the pump has been running for some time, it must be running with the correct
rotation or it would not have been pumping. You can reuse your existing grub screws if available.
Procedure:

Screw (anti-clockwise) the flexi-shaft onto the motor shaft and hand-tighten.

Insert the grub screw into the bottom thread and tighten.

Ensure the rotor is tightened into the flexi-shaft.

Insert the grub screw into the top thread and tighten.

Slide the pump body over the rotor ensuring no damage to the new rotor.

Using thread locker, insert and tighten the body screws.

Place the rubber stator over the rotor and push down until meets the body.

Place the top back over the stator.

Using thread locker, insert and tighten the top screws.

Check that you can turn the rotor by hand.

Recheck all bolts and screws to ensure fitting and return the pump to the water.