Wilo Stratos GIGA Serie Instrucciones De Instalación Y Funcionamiento página 59

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Fig. 49: Correct position of the impeller nut
after the installation
Installation and operating instructions Wilo-Stratos GIGA
when doing this (see chapter 7.1 "Permitted installation positions
and change of the arrangement of components before the instal-
lation" on page 21). Attach the lantern with the screws (Fig. 7,
Item 10) or – for the pump/lantern types in accordance with
(Fig. 46) – with the screws (Fig. 46, Item 8) at the motor flange.
23. Push the new rotating unit of the mechanical seal (Fig. 7, Item 12)
onto the shaft.
CAUTION! Danger of property damage!
Danger of damage due to incorrect handling.
• The impeller is attached with a special nut whose assembly
requires a particular procedure described below. If the installa-
tion instructions are not observed, there is a danger of over-
screwing the thread or of harming the pumping function. The
removal of damaged parts can be very difficult and lead to dam-
aging of the shaft.
• Apply thread paste to both impeller nut threads for every instal-
lation. The thread paste has to be suitable for stainless steels and
for the permitted operating temperature of the pump (e.g.
Molykote P37). Dry assembly can lead to thread seizing (cold
welding) of the thread and make the next dismantling impossible.
24. During the assembly of the impeller, put an open-end wrench
(0.9 in/22 mm is the best size) into the lantern window and hold
the shaft steady with the wrench surfaces (Fig. 48, Item 1).
25. Screw the impeller nut into the impeller hub as far as it will go.
26. Tighten the impeller together with the impeller nut on the shaft
by hand without changing the position achieved in the previous
step. Do not use a tool to tighten the impeller.
27. Hold the impeller and manually loosen the impeller nut by about
two rotations.
28. Without changing the position achieved in the previous step 27,
tighten the impeller together with the impeller nut on the shaft
again until increasing friction resistance occurs.
29. Hold on to the shaft (see step 24) and tighten the impeller nut
with the specified tightening torque (see Tab. 2 "Screw tightening
torques"). The nut (Fig. 49, Item 1) has to be about ±0.02 in
(±0.5 mm) flush with the end of the shaft (Fig. 49, Item 2). If this
is not the case, release the nut and repeat steps 25 to 29.
30. Remove the open-end wrench and reinstall the protective plate
(Fig. 7, Item 18).
31. Clean the lantern groove and insert the new O-ring (Fig. 7, Item
11).
32. Attach the motor impeller unit to the transport eyes with suitable
lifting equipment for the purpose of safeguarding. When attach-
ing, avoid damaging plastic parts, such as the fan wheel and the
upper part of the electronic module.
33. Insert the motor impeller unit (see Fig. 13) into the pump housing
in the old position or another desired angular position. Observe
the permitted installation positions of the components when
doing this (see chapter 7.1 "Permitted installation positions and
change of the arrangement of components before the installa-
tion" on page 21).
English
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