Richter MNKA-B Series (ASME) - Manual (Page 15)

Installation and Operating Manual
Series MNKA-B, acc. to ASME/ANSI
9250-055-en Revision 01
TM 5976 MPE/Wm Page 15 Edition 10/2004
Release setscrews 904/1 and 904/2 through this
opening.
Pull out hollow drive shaft 216.
7.6.3 Dismantling the slide-in unit
If the bearing pedestal has not been dismantled:
Caution ! Magnetic forces !
Risk of accident !
Axial forces are produced when the plain bearing
pedestal 339 is pulled out of the lantern 344. They
diminish again abruptly after it has been removed.
The torque of the magnetic drive installed is indicated
on the name plate.
Undo hex. screws 901/5 lantern/plain bearing
pedestal.
Pull plain bearing pedestal 339 out of the lantern
344.
Possibly loosen the centering of the plain bearing
pedestal with a rust dissolver and levers.
It is imperative to use clamping jaws with a
rubber surface!
Clamp the metallic surfaces of the plain bearing
pedestal 339 in a vice.
Using a strap wrench or assembly wrench, undo
the impeller 230 and inner magnet assembly 859.
Right-hand thread!
Remove inner magnet assembly 859.
Remove O-ring 912/3.
Pull the bearing sleeve 529/2, impeller 230,
bearing sleeve 529/1 and distance ring 504 out of
the plain bearing pedestal 339 or off the pump
shaft.
Make sure that no plain bearing parts fall.
Silicon carbide is easy to break.
Use isolated gloves when handling hot
bearings. Failure to follow this instructions
may result in property damage, sever
personal injury, or death.
If the bearing bushes 545 have to be removed
from the plain bearing pedestal 339, a Richter jig is
best used for this.
Store bearing sleeves 529 and bearing bushes 545
in pairs which belong together.
To dismantle the can (containment shell) 159, can
(containment shell) insert 158, intermediate ring
509/1, pull parts out of the lantern 344.
Only separate can (containment shell) 159 and can
(containment shell) insert 158 if one part has to be
replaced. If separation is not possible, the unit
must be cooled to approx. 41°F (5°C).
In the case of a vacuum-tight design the can
(containment shell) insert is glued to the can
(containment shell). Separation is not possible
without destroying the can (containment shell).
In the case of a can (containment shell) with a can
(containment shell) monitor using a flexible p.c.
board, dismantling is possible. Reassembly,
however, should only be performed at the
manufacturer's works.
7.7 Notes on assembly
All the details in Section 7.5, especially the notes on
safety, are to be observed.
Good mechanical engineering practice is to be
observed for assembly work.
Use original spare parts. See also Section 2.3. Do not
use defective parts.
Treat close-tolerance areas (not on stainless steel
parts) and screw thread with Anti-Seize-Spezial
assembly paste (e.g. Weicon).
The thread in the inner magnet assembly and on the
pump shaft must not be greased as otherwise the
adhesive does not hold.
Install plain bearings in pairs as supplied or stored.
Check whether all parts fit and then assemble them.
Important dimensions (centerings, bearing seats or
bearing clearances) are to be checked prior to
assembly, e.g. by fitting parts together as a test.
It is recommended to replace the gaskets 400/1 and
401 during assembly.
Prior to the assembly of parts with magnets, remove
any metal particles adhering to them.
A complete assembly process is described in the
following.
Sub-sections can be deduced from this.
7.8 Assembly
7.8.1 Assembly of adapter and motor
Screw adapter 346 and motor 800/1 together using
hex. screws 901/7.
Push hollow drive shaft 216 with key 940/3 onto
the motor shaft.
Tighten setscrews 904/1 and 904/2.
Screw in screw plug 903/3.
7.8.2 Drive magnet assembly
Mount drive magnet assembly 858 onto the hollow
drive shaft 216 so that the driver cams engage.
Screw in hex. socket screw 914/1 with tooth lock
washer 936/1. Secure thread with a drop of Loctite,
for example. For tightening, a hex. socket key with
120 mm minimum length is required.
Screw adapter 346 / lantern 344 together with hex.
socket screws 901/4.