Cleaning The Pump; Contaminated Pumps; Replacement Of Parts - Grundfos Unilift AP35B Installation And Operating Instructions Manual

8.1 Cleaning the pump

If the pump does not deliver a sufficient quantity of
water because of sediment, dismantle and clean the
pump.
To dismantle the pump, follow this procedure. Refer
to the appendix, fig. B.
1. Disconnect the power supply.
2. Lift the pump out of the liquid and allow it to
drain.
3. Remove the pump housing (50) by inserting a
screwdriver into the slot of one of the four spring
clamps (26) and press it downward until the
clamp comes loose. Repeat the procedure for all
four clamps.
4. Clean the pump housing, the pump, and the
impeller (49).
5. Check to make sure the impeller can rotate
freely. If not, remove and clean the impeller:
– Hold the impeller in place with a screwdriver
while loosening and removing the lock nut (67)
on the motor shaft.
– Clean the impeller and around the shaft.
6. Check the impeller and the shaft. If the impeller is
worn or defective, replace it.
7. Assemble the pump in the reverse order of
dismantling:
– Fit the impeller (49) with the washer and lock
nut (67). Make sure the impeller engages with
the shaft.
– Place the inlet part (6), the O-ring (37), the
pump housing (50) and the O-ring (7a) on top
of the ring stand (84) and lower the pump onto
this assembly.
– Fit the four spring clamps (26) using a
screwdriver.
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8.2 Contaminated pumps

Any application for service, no matter to whom it may
be made, must include details about the pumped
liquid.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with
clean water and rinse the pump
parts in water after dismantling.
The product will be classified as contaminated if it
has been used for a liquid which is injurious to health
or toxic.
If you request Grundfos to service the product,
contact Grundfos with details about the pumped
liquid before returning the product for service.
Otherwise Grundfos can refuse to accept the product
for service.
Any application for service must include details
about the pumped liquid.
Clean the product in the best possible way before
you return it.
Costs of returning the product are to be paid by the
customer.

8.3 Replacement of parts

The impeller assembly and power cable can be
replaced. The part numbers and the components
included in the service kits can be found in Grundfos
Product Center at www.grundfos.us. Alternatively,
contact your local Grundfos dealer or service center.