2. Remove the rotating assembly of the mechanical seal (primary ring) from shaft
sleeve 523.
3. Undo hexagon nuts 920.01 and 914.22, if any, on drive lantern 341.
4. Remove casing cover 161 from drive lantern 341.
5. Remove the stationary assembly of the mechanical seal (mating ring) from
casing cover 161.
6. Remove and dispose of gasket 400.75.
7.5 Reassembling the pump set
7.5.1 General information/Safety regulations
DANGER
Wrong selection of motor
Explosion hazard!
▷ Use an original motor or a motor of identical design from the same
manufacturer.
▷ The permissible temperature limits at the motor flange and motor shaft must
be higher than the temperatures generated by the pump.
WARNING
Improper lifting/moving of heavy assemblies or components
Personal injury and damage to property!
▷ Use suitable transport devices, lifting equipment and lifting tackle to move
heavy assemblies or components.
CAUTION
Improper reassembly
Damage to the pump!
▷ Reassemble the pump (set) in accordance with the general rules of sound
engineering practice.
▷ Use original spare parts only.
Always reassemble the pump in accordance with the corresponding general assembly
drawing or exploded view.
Check O-rings for any damage and replace by new O-rings, if required.
Always use new gaskets, making sure that they have the same thickness as the old
ones.
Always fit gaskets of asbestos-free materials or graphite without using lubricants
(e.g. copper grease, graphite paste).
Avoid the use of assembly adhesives, if possible.
Should an assembly adhesive be required after all, use a commercially available
contact adhesive (e.g. Pattex) or sealant (e.g. HYLOMAR or Epple 33).
Only apply adhesive at selected points and in thin layers.
Never use quick-setting adhesives (cyanoacrylate adhesives).
Coat the locating surfaces of the individual components with graphite or similar
before reassembly.
For reassembly, tighten all screws and bolts as specified in this manual.
7.5.2 Installing the mechanical seal
The following rules must be observed when installing the mechanical seal:
▪ Work cleanly and accurately.
Sequence
Sealing elements
Assembly adhesives
Tightening torques
Installing the
mechanical seal
7 Servicing/Maintenance
Normblock
41 of 58
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