Series
SCK,
Mechanical seal RG-4, stationary, double, liquid sealed
Page
5
9220-014-en
Revision 11
TM 7827
Edition 03/2019
●
Undo back plate (for instructions, see
Sections
4.2.1
and
7.7.4
in the installation and operating
manual SCK).
●
Move the back plate almost up to the impeller with
light hammer blows.
●
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 installa-
tion and operating manual SCK.
●
Loosen impeller
230
with a strap wrench or as-
sembly wrench.
Right-hand thread
. Press the
housing cover towards the impeller.
●
For assembly aid for impeller, see
Section 10.1
in
the installation and operating manual SCK.
●
Then completely remove the impeller
230
. Remove
the mating ring
475/1
and the flat gasket
400/1
.
●
Remove back plate (for sequence, see
Sections
4.2.1
and
7.7.4
in the installation and operating
manual SCK) with centering ring
511
, O-ring
412/3
, seal face
472/1
and intermediate ring
509/1
.
●
Remove seal housing
483
. Pull the rotary ring car-
rier
485/1
(comprising thrust ring
474
, spring
477/1
, stud
560/1
and snap ring
935/1
) out of the
seal housing
483
.
5.1.2 Dismantling the shaft sleeve
●
Pull the shaft sleeve
524
with the rotating unit
470/1
which is still installed off the shaft.
●
For changing the rotating unit, undo the setscrew
904/2
(depending on the design of the shaft
sleeve) and pull it off the shaft sleeve
524
. Obser-
ve the operating manual of the mechanical seal
manufacturer.
●
Remove mating ring
475/2
.
●
If plastic bearing points of the mating ring
475
or of
the shaft sleeve
524
are destroyed, they can be
renewed by the pump manufacturer.
5.2 Notes on assembly
●
Only use original spare parts.
●
Do not use any defective parts.
●
It is essential to observe the installation and oper-
ating instructions of the pump, pressurisation sys-
tem and mechanical seal manufacturer.
●
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.
●
The rotary ring carrier
485/1
must engage in the
spring-type slotted pin
531/1
. Mark position befo-
rehand.
●
The seal face
472/1
must engage in the studs
560/1
. Mark position beforehand.
●
In the case of the shaft sleeve made of Al
2
O
3
the
rotating unit
470/1
must be flush with the key
940/2
and tightened with the setscrew
904/2
. In
the case of the shaft sleeve made of stainless
steel the key is positioned firmly against one end.
●
When pushing on the mating ring
475/1,
make
sure that the position of the flat section matches
that on the shaft.
