4. Remove the pin housing (176) by pressing it up with the pin
pusher below the pin housing.
9.12 Removing the sleeve
1. Pull the sleeve (150) free of the stator housing (55) with two
crowbars.
TM031673
Removing the sleeve
2. Remove the O-rings (37a).
3. Remove the O-ring (159).
Related information
8.1 Servicing Grundfos pumps with explosion-proof motors
9.13
Removing the stator housing
1. Remove the screws (184) and washers (184a).
2. Fit the motor top (151) with screw (183).
3. Turn the pump in horizontal position and support with wooden
blocks or similar support.
4. Fit one of the screws (184) into the screw hole to loosen the
intermediate flange (155).
5. In case of sensor version: Pull the WIO sensor out of the stator
housing.
6. Carefully pull the intermediate flange (55) free and, at the same
time, push the wire of the WIO sensor (521) through the flange.
Do not use force when pulling the sensor wire.
Do not pinch the sensor under the intermediate flange.
7. Remove the WIO sensor (521) and moisture switch (520).
Related information
8.1 Servicing Grundfos pumps with explosion-proof motors
9.14 Removing the stator
1. Remove the pin housing (176), using the pin pusher (B).
2. Remove the plug protector (177), using the multiplug pliers (C).
3. Remove the screw (173) and the washer (173a).
4. Remove the upper bearing cover (61) from the stator housing
(55).
5. Block up the stator housing (55) so that it stands on the flange
at a height where the stator can come out underneath.
6. Heat the stator housing (55) until the stator (48) drops out. Heat
the stator housing uniformly so that it is not deformed. When
using a gas burner, heat up to approximately 200 °C. When
using a pre-heated oven, heat up to approximately 300 °C.
Related information
8.1 Servicing Grundfos pumps with explosion-proof motors
10. Contaminated pumps
CAUTION
Biological hazard
Minor or moderate personal injury
‐ Wear appropriate personal protective equipment and
clothing.
‐ Observe the local hygiene regulations in force.
WARNING
Biological hazard
Death or serious personal injury
‐ Flush the pump thoroughly with clean water and rinse
the pump parts after dismantling.
The product is classified as contaminated if it is used for contagious
or toxic liquid.
Contact Grundfos with details about the pumped liquid before
returning the product for service. Otherwise, Grundfos can refuse to
accept the product.
Any application for service must include details about the pumped
liquid.
Clean the product in the best possible way before returning it.
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