Maintenance; Cleaning The Pump - Grundfos Unilift KP 150 Installationsanleitung

8. Maintenance

Under normal operating conditions, the pump is
maintenance-free.
If the pump has been used for liquids other than
clean water, it should be flushed through with clean
water immediately after use.
Warning
For safety reasons the suction 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 pump,
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 suction 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 suction strainer
4. Clean the suction strainer and fit it again.
If the pump still delivers too little water, dismantle the
pump further.
Procedure:
1. Disconnect the power supply.
2. Remove the suction strainer (see point 3 above).
3. Turn the pump housing 90 ° counter-clockwise
using a screwdriver, see the arrow on the pump
housing. Pull off the pump housing. See fig. 11.
Pump housing
Fig. 11 How to remove the pump housing
4. Clean and flush the inside of the pump to remove
possible impurities between motor and pump
sleeve. Clean the impeller. See fig. 12.
Fig. 12 How to flush the pump
5. Check that the impeller can rotate freely. If not,
remove the impeller. See point 6.
6. Unscrew the nut (cross width 13 mm) from the
motor shaft. Use a screwdriver to prevent the
impeller from turning. See fig. 13.
Fig. 13 How to remove the impeller
7. Clean the impeller and clean around the shaft.
8. Check the impeller, the pump housing and the
sealing part. If necessary, replace defective parts.
9. Assemble the pump in the reverse order of the
dismantling.
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