Series MNKA,
acc. to ASME
Page 18
9250-050-en
Revision 11
TM 7903
Edition 07/2010
Both radial ball bearings lie against the shaft collar,
so remove them singly on a press.
Remove support bracket
183
(with bearing
pedestal group 2).
7.6.3 Dismantling the bearing pedestal,
oil bath lubrication
Remove hex. screw
901/4
and drain oil.
Clamp the end of the drive shaft
213
in a vice. Use
protective jaws.
Undo hex. socket screw
914/1
counterclockwise.
Pull off drive magnet assembly
858
.
Remove pump from the vice.
Undo rear bearing cover
361
and pull off the shaft
with the rotary shaft seal
421/1
and cover gasket
403
.
Remove wavy spring washer
953/1
.
Pull out drive shaft
213
with the two radial ball
bearings
321/1, 321/2
.
Both radial ball bearings lie against the shaft collar,
so remove them singly on a press.
Pull rotary shaft seal
421/2
out of the bearing
pedestal.
Remove support bracket
183
(with bearing
pedestal group 2).
7.6.4 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
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 gaskets
400/1
and
401
as well as the wavy spring washer
953/1
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.
