Wilo -EMU TR 50-2 Serie Notice De Montage Et De Mise En Service page 324

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9.6.4 Propeller replacement (stainless
steel)
8
9
5
4
Fig. 14: Propeller replacement (stainless steel)
9.6.5 Replacing the mechanical seal on
the fluid side
3
Fig. 15: Replacing mechanical seals
324
Maintenance and repair
1 Sealing plug
7
2 Propeller
4 Mechanical seal
5 Packing sleeve
6
6 Propeller attachment: Interior hexagonal head screw and washer
7 Retaining ring
8 Pressure disc
9 Shaft
‡
1
Mixer set down on a firm surface and secured.
‡
Tools are ready for use.
1. Remove the sealing plug.
2. Loosen and unscrew the propeller attachment. NOTICE! Fix the propeller in place
2
with suitable equipment.
3. Check the retaining ring is positioned correctly. The retaining ring secures the
pressure disc.
4. Carefully remove the propeller from the shaft: Screw in the M16 screw (min. 40 mm
long) into the pressure disc. This presses the propeller from the shaft. CAU-
TION! The mechanical seal is now no longer secured. Only operate the mixer
with the propeller! If the mixer is operated without the propeller, the mechan-
ical seal will be destroyed. If the mechanical seal is faulty, oil escapes from the
pre-chamber.
5. Clean the shaft and apply new lubricating grease.
6. Carefully slide the propeller back on as far as it will go.
7. Securing the propeller: Coat the interior hexagonal head screw with the thread-
locking fluid, insert the washer and screw it into the shaft.
8. Tighten the propeller attachment. Max. tightening torque: see appendix.
9. Turn the propeller by hand and check that it rotates easily.
10.Insert a new sealing plug or seal the propeller attachment using Sikaflex.
▶ Propeller is changed. Check the oil quantity in the pre-chamber and if necessary,
top up oil.
1 Shaft
4
2 Packing sleeve
3 Mechanical seal: Stationary ring
1
4 Mechanical seal: Spring
‡
Mixer set down on a firm surface and secured.
‡
Tools are ready for use.
‡
Oil drained from the pre-chamber.
‡
Propeller removed.
2
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
WILO SE 2019-01