Richter MNK Series - Manual (Page 18)

Series MNK 200-150-315
Page 18
9230-053-en Revision 12
TM 8195 Edition 03/2011
Caution!
When pulling out the slide-in unit, this component
must be secured against falling.
The integrated crane hook lug on the lantern can be
used for this purpose.
Or use the optionally available sliding and support
pedestal. See assembly aids in Section 11.4.
The operating torque of the magnetic coupling
installed is specified on the type plate.
7.6.1 Dismantling the slide-in unit
Transport the slide-in unit using the crane hook lug
moulded on the lantern.
As an adiitonal aid, the ring bolt provided can be
screwed into the bearing pedestal flange at 12
o'clock.
Beforehand, remove the threaded sealing cap.
As a result, two slinging aids are available.
Secure slide-in unit on a work bench or a work top.
Remove attachment screws 901/17 with washers
554/11.
Remove threaded sealing cap from the tapped
bores of the bearing pedestal flange.
Insert the two assembly threaded rods M 16
provided.
Using the flat pivot point on the threaded rods and
an open-jaw wrench (size 13), push the slide-in
unit out of the lantern chamber. While doing so,
turn the threaded rods evenly and alternately.
Caution! Magnetic forces!
Risk of accident !
Transport the drive unit using a crane. The ring
bolt on the bearing pedestal flange can be used for
this purpose.
Position the rest of the slide-in unit vertically with
the impeller facing down.
Remove screws 901/10 and lift off lantern 344, can
159 and can insert 158.
Clamp the plain bearing pedestal 339 with the
sealing surfaces in a vice.
It is imperative to use rubberised clamping
jaws so that the plastic sealing surfaces
are not damaged.
Undo impeller 230 and inner magnet assembly 859
by turning them in opposite directions. Right-hand
thread!
Either two strap wrenches or, even better,
appropriate special tools (see Assembly aids in
Section 11.3) are used for this purpose.
With magnetic drives >400 Nm the use of the
special tool is generally recommended.
Depending on whether the impeller 230 or the
inner magnet assembly 859 has been removed
from the pump shaft 211, a section of the pump
shaft can be raised or the pump shaft is pulled out
of the plain bearing pedestal 339 with the other
component.
This operation must be performed carefully as
plain bearing parts made of silicon carbide may be
removed unintentionally.
Make sure that no parts of the plain
bearing fall. Silicon carbide is easy to
break.
Clamp pump shaft 211 with the flat pivot point in a
vice. Use smooth vice jaws for this purpose.
Depending on which component has remained
connected to the pump shaft, unscrew the impeller
230 or the inner magnet assembly 859. A strap
wrench or the special tool suitable for the
component can be used for this purpose.
An appropriate Richter jig can be used to remove
the bearing bushes 545/1 and 545/2. See
Assembly aids in Section 11.2.
The can 159 and can insert 158 should only be
separated if one component has to be replaced.
The separation process can be simplified by
cooling the unit to approx. 5 °C.
With a vacuum-tight design it is not possible to
separate the can insert as it and the can are glued
together.
7.6.2 Dismantling the drive unit
Long life grease and grease
lubrication
Remove the hex. socket screw 914/5 with the lock
washer 934/4 and pull the drive magnet assembly
858 off the drive shaft 213. For this purpose do not
use any magnetisable tools.
Caution! Magnetic forces!
Risk of accident !
Remove hex. socket screws 914/6 and pull off the
rear bearing cover 361.
Remove wavy spring washer 953/1.
Pull or push the drive shaft 213 with the rolling
bearings 321/1 and 321/2 out of the bearing
pedestal 330 in the direction of the motor.
To change the rolling bearings 321/1 and 321/2,
they have to be pushed off the drive shaft 213.
Optional
The pump can be provided with regreasable
bearings. In this case there are rotary shaft seals
421/1 and 421/2 in the bearing pedestal 330 and in
the rear bearing cover 361. See Section 10.2.
The mating surfaces of the rotary shaft seals are
made of chromium-oxide-coated steel rings which
can be replaced, if necessary, at the works.