Maintenance; Cleaning The Pump - Grundfos Unilift KP serie Montage- Und Betriebsanleitung

8. Maintenance

Under normal operating conditions, the pump is
maintenance-free.
If the pump has been used for liquids other than
clean water, flush it through with clean water
immediately after use.
Warning
For safety reasons the inlet strainer
must always be fitted to the pump
during operation.
Never dismantle the pump unless the
power supply has been switched off.
Be careful during dismantling as you
will get access to sharp edges, etc.,
which may cause cuts. Wear protective
gloves.

8.1 Cleaning the pump

Warning
Before starting any work on the
product, make sure that the power
supply has been switched off and that it
cannot be accidentally switched on.
If the pump delivers too little water due to deposits or
the like, dismantle and clean the pump:
1. Disconnect the power supply.
2. Drain the pump.
3. Remove the inlet strainer.
– Press a screwdriver in between the pump
sleeve and the strainer and press hard. Do the
same in several places along the strainer until
it is pried loose and can be removed. See fig.
10.
Fig. 10 How to remove the inlet strainer
4. Clean the inlet strainer and fit it.
If the pump still delivers too little water, dismantle the
pump further.
1. Disconnect the power supply.
2. Remove the inlet strainer. See point 3 above.
3. Turn the pump housing 90 ° counter-clockwise
using a screwdriver. See the arrow on the pump
housing.
4. Pull off the pump housing. See fig. 11.
Pump housing
Fig. 11 How to remove the pump housing
5. Clean and flush the inside of the pump to remove
possible impurities between motor and pump
sleeve.
6. Clean the impeller. See fig. 12.
Fig. 12 How to flush the pump
7. Check that the impeller can rotate freely. If not,
remove the impeller. See point 6.
9