Wilo Vardo WEEDLESS-F Notice De Montage Et De Mise En Service page 258

en
9.6.4 Replacing the hub
1 2
Fig. 13: Installing/dismantling the hub
258
Maintenance and repair
NOTICE
Work steps for dismantling
The individual components are dismantled in reverse order to assembly.
Propeller blade replacement is performed with the mixer installed. Observe the follow-
ing points:
▪ Prepare the operating space/installation site:
– Clean, free of coarse solids
– Dry
– Frost-free
– Decontaminated
▪ Work must always be carried out by two persons.
▪ Avoid any painful or tiring body postures.
▪ When working at a height of more than 1 m (3 ft) above the ground, use scaffolding
with a safety harness.
▪ Cordon off the working area around the scaffolding.
▪ Toxic or asphyxiating gases may build up when working in closed rooms. Ensure there is
sufficient ventilation and observe protective measures according to work regulations
(examples):
– Measure the gas concentration before entering.
– Carry a gas detector with you.
– etc.
▪ Take immediate countermeasures if there is a build-up of toxic or asphyxiating gases.
▪ To remove/install the cover cap, see "Mounting the cover cap [} 245]".
▪ To remove/install the propeller blades, see "Attaching the propeller blades [} 243]".
▪ Inspect the individual propeller blades for wear. Replace all propeller blades if necessary.
Consult customer service!
▪ Note the setting angle. A different angle changes the flow behaviour.
Disassembling the hub
3 4
1
2
3
4
5
6
7
‡
Propeller blades are removed. See "Attaching the propeller blades [} 243]".
‡
Cover cap is removed. See "Mounting the cover cap [} 245]".
5 ‡
Align the mixer shaft horizontally: Position scantlings under the mixer shaft.
1. Loosen the interior hexagonal head screws (black and silver) of the front tensioning
kit. NOTICE! Do not unscrew the screws completely!
6
2. Loosen the tensioning kit: screw out silver screws (M8). Screw in M10 screw and
loosen tensioning kit.
7
3. Pull the front tensioning kit off the mixer shaft.
4. Loosen the interior hexagonal head screws (black and silver) of the rear tensioning
kit. NOTICE! Do not unscrew the screws completely!
5. Loosen the tensioning kit: screw out silver screws (M8). Screw in M10 screw and
loosen tensioning kit.
6. Pull the hub off the mixer shaft.
7. Pull the front tensioning kit off the mixer shaft.
Installing the hub
‡
New flat gasket to hand.
‡
Stretching device to hand.
Mixer shaft
Flat gasket
Tensioning kit, rear
Hub
Tensioning kit, front
Interior hexagonal head screw, black
Interior hexagonal head screw, silver
WILO GVA GmbH 2019-02