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10.2.2
Changing the motor
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-08
pletely screwed in and that the central screw thread bears at least 12 mm in the motor
shaft thread in this position. In case necessary, use the supplied washers.
6.
By unscrewing the central screw, lower the retaining washer of the motor shaft by
about 5 mm (Fig. XIV).
7.
Put the first key (Fig. XV, Item 1) in the impeller shaft, put on the retaining washer
(Fig. XV, Item 2) of the impeller shaft and screw in the hexagon head screw (Fig. XV,
Item 3) by hand.
8.
Rotate the motor shaft so that the motor shaft key and impeller shaft key are opposite
each other.
9.
Put the first coupling half on the two keys and the retaining washers (Fig. XVI).
10. Align the threaded hole in the impeller shaft retaining washer to the installation drilled
hole of the coupling half.
11. Insert one of the coupling screws into the installation drilled hole and screw in half way
(Fig. XVII).
NOTICE
For all subsequent work, observe the torque specified for the respective
thread type (see tightening torques table)!
12. Tighten the central screw of the impeller shaft with the prescribed torque. Use a strap
wrench to apply counter pressure.
13. Tighten the mounting screw (Fig. XVII).
14. Tighten the central screw of the motor shaft with the prescribed torque (Fig. XVIII,
Item 1). Use a strap wrench to apply counter pressure.
15. Insert the second key (Fig. XIX, Item 2) of the impeller shaft.
16. Put on the second coupling half (Fig. XIX, Item 1).
17. Evenly screw the available coupling screws, as a final step, the coupling screw from the
installation drilled hole (Fig. XX).
18. Unscrew both mechanical seal press-out forcing screws from the cover (Fig. XXI).
19. Carefully vertically press the mechanical seal into its seat. Avoid damage to the mech-
anical seal due to jamming (Fig. XXI).
20. Screw in all four cover screws (Fig. XXII, Item 1) and tighten them with the prescribed
torque.
21. Rescrew and tighten the four interior hexagonal head screws (locking pins, Fig. XXII,
Item 2) completely in succession.
22. Install the coupling guard metal sheets (Fig. XXIII).
23. Connect the motor cable.
Increased bearing noises and unusual vibrations indicate bearing wear. The bearings or mo-
tor must then be replaced. The drive may only be replaced by the Wilo customer service!
Dismantling: Fig. XXIV to XXVII
WARNING
Risk of scalding!
At high fluid temperatures and system pressures, allow the pump to cool
down first and then depressurise the system.
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