Wilo Stratos GIGA2.0-I Notice De Montage Et De Mise En Service page 262

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Fig. 100: Threaded holes and slots for pulling
the motor impeller unit off the pump housing
Fig. 101: Wrench flats on the shaft
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Maintenance
11. When the screws (Fig. I, Item 10) are removed, the differential pressure sensor will
also be released from the motor flange. Suspend the differential pressure sensor
(Fig. I, Item 8) with the holder (Fig. I, Item 13) from the pressure measuring lines
(Fig. I, Item 7). Disconnect the connection cable of the differential pressure sensor
in the electronic module.
12. Pull the motor impeller unit off the pump housing. To do this, use the two threaded
holes (Fig. 99, Item 1).
Screw suitable screws into the threaded holes to loosen the fit. If the motor im-
peller unit can be moved easily, the slots (Fig. 100, Item 2) between the pump
housing and the lantern can additionally be used to pull it off. For example, use two
screwdrivers as levers to do this. After pressing out by about 15 mm the motor im-
peller unit will no longer be guided in the pump housing.
NOTICE
In order to avoid tipping, the motor impeller unit may have to be supported with
suitable lifting equipment. This is especially the case if no mounting bolts are used.
13. Release the two non-detachable screws from the protective plate (Fig. I and Fig. III,
Item 27) and remove the protective plate.
⇒ Version with plastic impeller and cone connection
14. Insert an open-end wrench (22 mm width across flats) into the lantern window and
hold the shaft by the wrench flats (Fig. 101, Item 1). Unbolt the impeller nut (Fig. I,
Item 22). The impeller (Fig. I, Item 21) is automatically pulled off the shaft.
15. Dismantle the shim (Fig. I, Item 20).
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⇒ Version with cast impeller and parallel key connection
16. Loosen impeller fastening nut (Fig. I, Item 22). Remove the conical spring washer
underneath (Fig. III, Item 23) and remove the impeller (Fig. I, Item 21) from the
pump shaft. Dismantle the key (Fig. III, Item 37).
17. Depending on the pump type, loosen the screws (Fig. I, Item 10) or, alternatively,
the screws (Fig. 99, Item 2), (Fig. II, Item 10b) or Fig. III, Item 10.
18. Release the lantern from the motor centring device with a two-arm puller (univer-
sal puller) and pull it off the shaft. The mechanical seal (Fig. I, Item 25) and spacer
(Fig. I, Item 20) will also be removed at the same time. Avoid jamming the lantern.
19. Press the mechanical seal's stationary ring (Fig. I, Item 26) out of the seat in the
lantern.
20. Carefully clean the seat areas on the shaft and the lantern.
WILO SE 2021-12