Richter Mechanical Seals - Manual (Page 6)

Series SCK, mechanical seal, external, single Page 6
single with double lip seal on the wetted side
single with lip seal on the atmosphere side, with quench
9220-060-en Revision 10
TM 7827
Edition 03/2010
Pull the back plate 161 with the mating ring
adapter 487 and mating ring 475/1 off the shaft
sleeve.
After undoing the nuts 920/3 with the washers
554/3
, the mating ring adapter 487 is removed first.
Then remove mating ring 475/1.
Now pull the shaft sleeve 524 with the rotating unit
470/1
which is still installed off the shaft.
When changing the rotating unit 470/2, observe
the operating manual of the mechanical seal
manufacturer.
Remove distance bush 543 and clean.
If it is discovered after pulling off a shaft sleeve made
of a ceramic material that its plastic bearing points are
destroyed, they can be renewed by the pump
manufacturer.
5.1.2 Notes on assembly
Only use original spare parts.
Do not use any defective parts.
The recommendations of the mechanical seal
manufacturer are to be observed.
Bearing pedestal group 3:
Always make sure that when installing the
mechanical seal the labyrinth disc is secured by 2
bolts.
The bolts must be removed again after assembly
of the impeller.
External single mechanical seals can best be
brought to the required pre-tension with a
tensioning device available from Richter. See
Section 10.4
assembly aids in the installation and
operating manual SCK.
Prepare rotating unit (observe setting dimension)
and tighten on the shaft sleeve.
5.2 Single mechanical seal with
double lip ring
Dismantling can be checked using the sectional
drawings in Section 7.3 and Section 9 in the
installation and operating manual SCK, also the
available components.
5.2.1 Dismantling
Remove seal guard 685.
Remove tube 710
Undo setscrews 904/1 of the distance bush 543.
Undo attachment screws of the rotating unit 470/2.
Undo screws of bearing pedestal 330 / back plate
161
and, with the mating ring 475/1 and the mating
ring adapter 487 still mounted, move up to the
impeller with light hammer blows (plastic hammer).
For design of back plate, see Section 4.2 and
7.7.4
in the installation and operating manual SCK.
Bearing pedestal group 3:
Labyrinth disc 555 must be secured with
two bolts prior to the dismantling of the
impeller. For this purpose there are 2
bores Ø5mm in the bearing pedestal. The
double mechanical seal is relieved of pressure as
a result. See dismantling in Sections 7.7.1 and
7.7.5
in the installation and operating manual SCK.
Undo impeller 230 with a strap wrench or
assembly wrench. Right-hand thread.
For assembly aid for impeller, see Section 10.1 in
the installation and operating manual SCK.
See also installation and operating manual SCK,
Section 7.7.1
.
Unscrew the impeller 230 completely.
Pull the back plate 161 with the mating ring
adapter 487 and mating ring 475/1 off the shaft
sleeve.
After undoing the nuts 920/3 with the washers
554/3
, the mating ring adapter 487 is removed first.
Remove mating ring 475/1.
Remove retaining ring 506.
Pull the intermediate ring 509/2 and the lip seal
413
off the shaft sleeve 524.
The shaft sleeve 524 can now be pulled with the
rotating unit 470/2 off the shaft 210.
When changing the rotating unit 470/2, observe
the operating manual of the mechanical seal
manufacturer.
Remove distance bush 543 and clean.
If it is discovered after pulling off a shaft sleeve made
of a ceramic material that its plastic bearing points are
destroyed, they can be renewed by the pump
manufacturer.