en
Maintenance and repair
38
WILO SE 2021-05
Mechanical screw locking device
The mechanical screw locking device consists of two Nord-Lock wedge lock washers.
The screw connection is secured by a clamping force.
9.6.2
Which repair work may be carried
out
ƒ
Replacement of the propeller
ƒ
Replacement of mechanical seal on the fluid side.
ƒ
Replace the handle grip.
ƒ
Replacement of the frame.
9.6.3
Propeller replacement
For all information on propeller blade replacement, please see the separate instructions
for “Blade installation”.
9.6.4
Replacing the mechanical seal on
the fluid side
1
2
3
4
5
6
Fig. 13: Change of the mechanical seal on the
fluid side
1
Shaft
2
Packing sleeve
3
Mechanical seal: Stationary ring
4
Mechanical seal: Spring
5
Propeller blade
6
Hub
‡
Mixer set down on a firm surface and secured.
‡
Tools are ready for use.
‡
Oil drained from the pre-chamber.
‡
Propeller (blade with hub) dismantled.
1. Remove the mechanical seal spring from the shaft.
2. Carefully remove the packing sleeve using a rubber mallet.
3. Push the stationary ring of the mechanical seal out of its seating and remove from
the shaft.
4. Clean the shaft and check for wear and corrosion.
WARNING! Contact customer
service if the shaft has been damaged!
5. Lubricate the shaft using wetted water or detergent.
CAUTION! Do not use oil or
grease as lubricants!
6. Press in a new stationary ring for the mechanical seal into the housing using an as-
sembly unit.
CAUTION! Do not tilt the stationary ring when pushing it in. If the
stationary ring is tilted or installed at an angle when it is pushed in, the station-
ary ring will fracture. The mechanical seal can then no longer be used!
7. Installing the packing sleeve: Coat the packing sleeve mating surface using Loctite
262 or 2701. Press on the packing sleeve in position using a rubber mallet.
8. Install a new mechanical seal spring on the shaft.
9. Mount the propeller.
▶ Mechanical seal is replaced. Top up oil in the pre-chamber.
