Richter MNK-B Series, Installation And Operating Manual

Page: 16 / 27

Series MNK-B,
size 25-25-100
Page 16
9230-056-en Revision 14
TM 9542 Edition 06/2016
7.6 Dismantling
There are two possibilities for dismantling:
1. Dismantling the complete pump from the plant.
2. Dismantling the complete slide-in unit as the pump
housing can remain in the plant connected to the
piping.
Dismantling of the complete pump is described here.
The operating torque of the magnetic coupling
installed is specified on the
type plate .

Undo housing screws 901/3 , 554/9 .

Remove entire slide-in unit with motor.
If the housing remains in the plant, leave the
housing gasket in the centering to protect the
housing sealing surface.
7.6.1 Dismantling the slide-in unit

Secure slide-in unit on the work bench or a work
top.

Remove intermediate ring 509/1 .

Remove back plate 161 with impeller 230 and
bearings.

Remove bearing nut 923 . Note: left-hand thread!

Remove left-hand thrust bearing part 393/1 .

Remove impeller 230 with bearing bushes 545/1
and 545/2 .

If necessary, remove bearing bushes 545/1 , 545/2
and distance washers 551/1 , 551/2 from the
impeller.

Remove bearing sleeve 529/1 .

Remove right-hand thrust bearing part 393/2 .

Keep the bearing bushes 545 how installed.
7.6.2 Dismantling of drive unit
The magnets on the flywheel mass are now exposed.
They are every brittle and therefore sensitive
to shocks or impacts.
If no further dismantling of the lantern, motor
and flywheel mass takes place, the magnets must be
well protected, e.g. by a plastic disc which is inserted
into the centering of the lantern.

Remove hex. screw 901/9 with disc 550/1 .

Pull flywheel mass 599 off the motor shaft.
Unscrew lantern 344 with hex. socket screw 914/3
and washer 554/8 off the motor.
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).

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 lantern 344 with hex. socket screw 914/3
and washer 554/8 to motor.

Push flywheel mass 599 right onto the motor shaft
and screw together with disc 550/1 and hex. screw
901/9 .
7.8.2 Assembly of slide-in unit

Clamp the metallic hub of the back plate 161 in a
vice.

Install right-hand thrust bearing part 393/2 .

Install bearing bush 529/1 .
7.8.3 Trial assembly of impeller and
bearing bush

Install bearing bushes 545/1 and 545/2 in the
impeller 230 and press tight together.

Push this unit onto the bearing sleeve 529/1 .

Install left-hand thrust bearing part 393/1 .

Screw on bearing nut 923 . Left-hand thread .