Wilo Stratos GIGA2.0-I Notice De Montage Et De Mise En Service page 263

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Fig. 102: Correct position of the impeller nut
after installation
Installation and operating instructions Wilo-Stratos GIGA2.0-I, Wilo-Stratos GIGA2.0-D
Maintenance
Installation
NOTICE
For all the following work, observe the screw tightening torque specified for the re-
spective thread type ("Tightening torques" [} 159] table)!
Elastomers (O-ring, mechanical seal bellows) are easier to install with "wetted wa-
ter" (e.g. mixture of water and washing up liquid).
1. Clean the flange support and centring surfaces of the pump housing, lantern and
motor flange to ensure proper positioning of the parts.
2. Insert a new stationary ring in the lantern. Carefully push the lantern over the shaft
and position it in the old position or another desired angular position relative to the
motor flange. Observe permitted installation positions of the components (see
section "Permitted installation positions and change of the arrangement of com-
ponents before installation" [} 154]).
CAUTION
Damage due to incorrect handling!
The impeller is attached with a special nut whose installation requires a particular
procedure described below. If the installation instructions are not observed, there is
a danger of overtightening the thread or of endangering the pumping function. The
removal of damaged parts can be very difficult and result in damaging the shaft.
Apply thread paste to both impeller nut threads for every installation. The thread
paste has to be suitable for stainless steels and for the permitted operating temper-
ature of the pump, e.g. Molykote P37. Dry assembly can lead to thread seizing (cold
welding) of the thread and make subsequent dismantling impossible.
⇒ Version with plastic impeller and cone connection (Fig. I)
3. 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).
4. Screw the impeller nut into the impeller hub as far as it will go.
5. Screw the impeller together with the impeller nut hand-tight onto the shaft. Do
not change the position achieved in the previous step. Never use a tool to tighten
the impeller.
6. Hold the impeller and manually loosen the impeller nut by about two rotations.
7. Screw the impeller together with the impeller nut onto the shaft again until friction
resistance increases. Do not change the position achieved in the previous step.
8. Hold the shaft with open-end wrench (22 mm width across flats) and tighten the
impeller nut to the prescribed tightening torque (see table "Tightening
torques" [} 159]). The nut (Fig. 102, Item 1) has to be about ±0.5 mm flush with
the end of the shaft (Fig. 102, Item 2). If this is not the case, release the nut and re-
peat steps 4 – 8.
9. Remove the open-end wrench and reinstall the protective plate (Fig. I/III, Item 27).
⇒ Version with cast impeller and parallel key connection (Fig. III)
10. Install the impeller with washer(s) and nut, countering at the impeller's outer dia-
meter while doing so. Avoid damage to the mechanical seal due to jamming.
11. Clean the lantern groove and insert the new O-ring (Fig. I, Item 19).
12. Attach motor impeller unit to the transport lugs with suitable lifting equipment for
protection. When attaching, avoid damaging plastic parts such as the fan wheel
and the upper part of the electronic module.
13. Insert the motor impeller unit (see Fig. 98) into the pump housing in the old posi-
tion or another desired angular position. Observe permitted installation positions
of the components (see section "Permitted installation positions and change of the
arrangement of components before installation" [} 154]).
14. The use of mounting bolts is recommended (see section "Accessories" [} 150]).
Once the lantern guide has firmly engaged, (about 15 mm before the end position),
there is no longer any danger of tipping or tilting. After the motor impeller unit has
en
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