Richter MNK Series - Manual (Page 18)

Series MNK
Page 18
9230-050-en Revision 11
TM 7903 Edition 07/2010
If necessary, press the shaft seals 421/1 and
421/2 out of the bearing cover 360 and rear
bearing cover 361.
Dismantling can be checked using the sectional
drawing in
Section 9.2 and the components
available.
7.6.5 Changing the radial ball bearings
Oil bath lubrication
To change the radial ball bearings 321, perform
dismantling as described in Section 7.6 .
Pull plain bearing pedestal out of the bearing
pedestal. See
Section 7.6.1 .
The plain bearing pedestal with the impeller, inner
magnet assembly and pump shaft need not be
dismantled.
For further dismantling, see Section 7.6.2 .
Change radial ball bearings 321 .
It is recommended to also change the shaft seals
421 when the bearings are being replaced.
Assembly as described in Section 7.8 .
7.7 Notes on assembly
Use original spare parts. See also Section 2.4 .
Do not use any defective parts.
Has the pump been shut down, drained and
flushed in accordance with the regulations?
See also
Section 6.3 .
Apply Anti-Seize-Special assembly paste (e.g.
from Weicon) to fitted surfaces (not stainless steel
parts).
The thread in the impeller
230 , the inner magnet
assembly 859 and on the pump shaft 211 must
not be greased as otherwise no optimum glued
connection is possible.
Install plain bearings in pairs as supplied or
stored.
Check whether all parts fit and only then
assemble.
Important dimensions (centerings, bearing fits or
bearing play) are to be checked prior to assembly;
perform a trial assembly if required.
It is recommended to replace the housing gasket
401 during assembly.
Many metallic particles adhering to magnetic
components such as the inner magnet assembly
859 and drive magnet assembly 858 must be
removed prior to assembly. For this purpose
simple plasticene can be used..
A complete assembly process is described in the
following.
Sub-sections can be deduced from this.
See also
Section 7.5 .
7.8 Assembly
7.8.1 Assembly of drive unit
Long life grease lubrication
Assemble drive shaft 213 and drive magnet
assembly 858 .
Place drive magnet assembly vertically on a
suitable base.
Press new radial ball bearing
321/1 onto the drive
shaft 213 , and then the distance sleeve 525 .
Insert circlip 932/1 .
Lower the bearing pedestal 330 from above onto
the unit drive shaft/drive magnet assembly.
Press on second new radial ball bearing
321/2 .
Engage circlip 932/2
Mount rear bearing cover 361 .
Insert second circlip 932/3 .
Install can insert into the can. If this is not
possible, cool can insert to approx. 5 °C.
Place intermediate ring
509/1 and then support
ring 518 in the bearing pedestal.
Insert the entire unit into the bearing pedestal.
7.8.2 Assembly of drive unit
Oil bath lubrication
Screw hex. screw 901/4 into the bearing pedestal
330 .
Assemble drive shaft 213 and drive magnet
assembly 858 .
Place drive magnet assembly vertically on a
suitable base.
Insert shaft seal
421/2 into the bearing pedestal.
Insert O-ring 412/5 into the bearing pedestal
groove and screw bearing cover 360 to bearing
pedestal 330 . Carefully guide the bearing
pedestal over the drive shaft; do not damage the
shaft seal
421/2 .
Press new radial ball bearing 321/1 onto the drive
shaft 213 , and then the distance sleeve 525 .
Insert circlip 932/1 .
Press on second new radial ball bearing 321/2 .
Engage circlip 932/2
Mount rear bearing cover 361 with shaft gasket
421/1 and O-ring 412/1 .
Insert second circlip 932/3 .
Install can insert into the can. If this is not
possible, cool can insert to approx. 5 °C.
Place intermediate ring
509/1 and then support
ring 518 in the bearing pedestal.