Richter MNK-B Series - Manual (Page 16)

Series MNK-B, close-coupled design Page 16
9230-055-en Revision 09
TM 7345 Edition 10/2008
Make sure that no parts of the plain bearing
fall. Silicon carbide is easy to break.
Keep bearing sleeves 529 and bearing bushes 545
in pairs which belong together.
Clamp pump shaft 211 with the flat pivot point in a
vice. Use smooth clamping jaws.
Undo impeller 230 or inner magnet assembly 859
(depending on which part has remained on the
pump shaft).
If the bearing bushes 545 have to be removed
from the plain bearing pedestal, a Richter jig is
best suited for this purpose. See assembly aids in
Section 10.3
Loosen the centering of these components by
means of the support ring 518 at the side recesses
in the lantern.
To dismantle the can 159, can insert 158,
intermediate ring 509/1 and support ring 518,
loosen the centering of the support ring 518 on the
side recesses in the lantern 344.
Pull parts out of the lantern 344.
Only separate can 159 and can insert 158 if one
part has to be replaced. If separation is not
possible, the unit must be cooled to approx. 5 °C.
In the case of a vacuum-proof design the can
insert is glued to the can. Separation is not
possible without destroying the can.
In the case of a can with a can monitor using a
flexible p.c. board, dismantling is possible. We
recommend you, to have the reassembly be
performed at the manufacturer's.
7.6.2 Dismantling of drive unit
Separate hollow drive shaft and drive magnet
assembly with hex. screws 901/5, lock washers
934/1.
Undo setscrew 904/1.
Pull hollow drive shaft 216 off motor shaft.
Undo hex. screws 901/7 and washers 554/7 and
transition ring 820 off the motor flange (possibly
use two levers).
Dismantling can be checked using the sectional
drawing in Section 9 and the components
available.
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
Screw transition ring 820 to the motor 800/1.
Screw hollow drive shaft 216 and drive magnet
assembly 859 together (901/5, 934/1).
Push hollow drive shaft 216 fully onto motor shaft
with key.
Observe control dimension L, see drawing in
Section 9.2 and pump works certificate.
Drill the key of the motor shaft for setscrew 904/1.
Screw on the setscrew 904/1 and secure with
Loctite 243.
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 lantern.
Insert the entire unit into the lantern.
7.8.2 Perform trial assembly of plain
bearing pedestal with impeller, inner
magnet assembly and plain bearings
Without adhesive
Without O-rings 412/3, 412/4
Without distance ring 504
Without distance washers 551/1, 551/2
Install bearing bushes 545/1, 545/2 and press in
firmly.
Screw the inner magnet assembly 859 onto pump
shaft 211 and tighten.