Richter MNK Series - Manual (Page 17)

Series MNK
Page 17
9230-050-en Revision 11
TM 7903 Edition 07/2010
Axial forces are produced when the plain bearing
pedestal is pulled out of the bearing pedestal. These
forces diminish again abruptly after it has been
removed.
The operating torque of the magnetic coupling
installed is specified on the
type plate .
7.6.1 Dismantling the slide-in unit
Secure slide-in unit on the work bench or a work
top.
Pull the plain bearing pedestal
339 out of the
bearing pedestal.
Caution! Magnetic forces!
Risk of accident !
If necessary loosen the centering of the plain
bearing pedestal using a rust dissolver and levers.
It is imperative to use clamping jaws with
a rubber surface.
Clamp the plain bearing pedestal 339 with the
sealing surfaces in a vice.
Undo the impeller
230 and inner magnet
assembly 859 with a strap wrench. Right-hand
thread !
Pull parts out of the plain bearing pedestal 339 or
off the pump shaft 211 .
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 .
To dismantle the can 159 , can insert 158 ,
intermediate ring 509 and support ring 518,
loosen the centering of the support ring 518 on
the side recesses in the bearing pedestal 330 .
Pull parts out of the bearing pedestal 330 .
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 the drive unit
Long life grease lubrication
Remove circlip 932/3 on the motor side.
Remove rear bearing cover 361 . Use groove for
dismantling.
Remove circlip
932/2 .
Press drive shaft 213 with drive magnet assembly
858 out of the bearing pedestal.
Remove radial ball bearings 321/1 .
Remove second circlip 932/1 .
Remove distance sleeve 525 and second radial
ball bearing 321/2 .
Dismantling can be checked using the sectional
drawing in
Section 9.2 and the components
available.
7.6.3 Changing the radial ball bearings
Long life grease lubrication
To change the radial ball bearings 321, perform
dismantling as described in Section 7.6 .
Pull the plain bearing pedestal 339 out of the
bearing pedestal. See Section 7.6.1 .
The plain bearing pedestal with impeller, inner
magnet assembly and pump shaft need not be
dismantled.
The rest dismantheling see Section 7.6.2 .
Change radial ball bearings 321 .
Assembly as described in Section 7.8 .
7.6.4 Dismantling the drive unit
Oil bath lubrication
Remove hex. screw 901/4 and drain oil.
Remove hex. socket screw 914/1 with spring
washer 934/2 for the bearing cover. For this
purpose assembly bores are provided in the drive
shaft
213 for a hex. socket screw key.
Remove circlip 932/3 on the motor side.
Remove rear bearing cover 361 with shaft seal
421/1 and O-ring 412/1 . Use groove for
dismantling.
Remove circlip
932/2 .
Press the drive shaft 213 with drive magnet
assembly 858 out of the bearing pedestal.
Remove radial ball bearings 321/2 from the
bearing pedestal.
Remove circlip
932/1 .
Remove distance sleeve 525 , radial ball bearings
321/1 , O-ring 412/5 and bearing cover 360 using
an extractor.
Dismantle drive magnet assembly
858 and drive
shaft 213 .