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6.
Depressurise the pump by opening the air vent valve (Fig. XXIX/XXX/XXXII, Item 1.31).
NOTICE
For all subsequent work, observe the torque specified for the respective
thread type (see tightening torques table)!
7.
Remove the coupling guard metal sheets (Fig. I, Item 1) with a suitable tool (e.g. screw-
driver).
8.
Turn the coupling/shaft so that the four interior hexagonal head screws (twist guard;
Fig. II Item 1) are opposite the cover holes.
9.
Unscrew the interior hexagonal head screws (locking pins) one after the other until the
head is countersunk half way into the cover collar (Fig. II or Fig. III depending on the
pump type).
10. Unscrew all four cover screws (Fig. IV).
11. Screw in two of the cover screws up to the stop into the press-off drilled holes to press
the cover out of its seat (Fig. IV/V).
12. Unscrew one of the coupling screws and turn it all the way into one of the installation
drilled holes (Fig. VI, Item 1). To do this, the coupling half is fixed by the retaining
washer (Fig. VI, Item 3) at the impeller shaft.
13. Unscrew the remaining coupling screws and take off the loose coupling half. If need
be, use the provided press-off drilled holes (Fig. VI, Item 4). The impeller shaft is now
held up by the retaining washer (Fig. VII, Item 1).
14. Unscrew the hexagon head screw (Fig. VII, Item 2) at the motor shaft to lower the re-
taining washer (Fig. VII, Item 1), thereby lowering the impeller/impeller shaft (Fig. VII,
Item 3). When the impeller has been completely lowered (Fig. VIII, after a travel of
about 5 mm), completely take out the hexagon head screw and the retaining washer.
15. Unscrew the coupling screw out of the installation drilled hole and remove the remain-
ing coupling half (Fig. IX). If need be, use the provided press-off drilled holes.
16. Unscrew the central screw (Fig. X, Item 2) of the impeller shaft and remove it with the
retaining washer (Fig. X, Item 3).
17. Take out both impeller shaft keys (Fig. X, Item 1).
18. Carefully pull off and remove the mechanical seal (Fig. XI) from the impeller shaft.
Installation: Fig. XII to XXIII
NOTICE
Thoroughly clean the sliding/seat surfaces of the impeller shaft and the
lantern. If the shaft is damaged, it must be replaced. Always use new
screws for the twist guard. Replace the O-rings in the cover groove and
in the shaft sleeve groove.
1.
Completely screw in a cover screw (Fig. XII, Item 1) into each of the two press-off
drilled holes of the cover.
2.
Be sure that all interior hexagonal head screws (locking pins) are countersunk half way
into the cover collar (Fig. XII).
3.
Put the mechanical seal onto the impeller shaft in such a way that the four drilled holes
for the cover screws are opposite the threads (Fig. XIII). Attention: If the drilled holes of
the locking pins are not arranged at 90° to each other, pay attention to the installation
position. The drilled holes must point towards the lantern window to facilitate access-
ibility of the grub screws (Fig. II or Fig. III, depending on the pump type). Push the
mechanical seal on until the forcing screws are on the housing. A commercially avail-
able dishwashing liquid can be used as a lubricant.
4.
Check the keys in the motor shaft for correct seating.
5.
Push the motor shaft retaining washer on and fix with central screw (Fig. XIV). Ensure
that the motor shaft retaining washer is well seated when the central screw is com-
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-08
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