en
Maintenance and repair
34
WILO GVA GmbH 2019-02
9.6.4
Replacing the hub
Disassembling the hub
1
2
3
4
6
5
7
Fig. 13: Installing/dismantling the hub
1
Mixer shaft
2
Flat gasket
3
Tensioning kit, rear
4
Hub
5
Tensioning kit, front
6
Interior hexagonal head screw, black
7
Interior hexagonal head screw, silver
‡
Propeller blades are removed. See “Attaching the propeller blades [
}
18]”.
‡
Cover cap is removed. See “Mounting the cover cap [
}
21]”.
‡
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!
2. Loosen the tensioning kit: screw out silver screws (M8). Screw in M10 screw and
loosen tensioning kit.
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.
1. Place the flat gasket on the lower end of the mixer shaft and slide up as far as it will
go.
2. Place the rear tensioning kit on the mixer shaft and slide up as far as it will go.
3. Place the hub on the mixer shaft and slide up as far as it will go.
4. Tighten interior hexagonal head screws (4x silver) in a crosswise manner until
hand-tight.
⇒ The hub is now secured against slipping.
5. Tighten interior hexagonal head screws (10x black) in a crosswise manner until
hand-tight.
6. Place stretching device on mixer shaft and hub ring.
7. Affix the stretching device to the mixer shaft: Screw in the hexagon head screw
through the stretching device and into the centring hole in the mixer shaft.
8. By slowly turning the hexagon head screw, mount the hub completely on the mixer
shaft.
NOTICE! End position: The stretching device is flush with the mixer shaft
and the hub ring!
9. Tighten all interior hexagonal head screws in a crosswise manner.
Tightening
torque: 35 Nm (26 ft·lb)!
⇒ The hub is firmly fixed to the mixer shaft.
10.Remove the stretching device: Remove the hexagon head screw.
11.Tighten covered interior hexagonal head screws in a crosswise manner.
Tightening
torque: 35 Nm (26 ft·lb)!
12.Place the front tensioning kit on the mixer shaft and slide up as far as it will go.
