Richter RMA Series, Installation And Operating Manual

Page: 17 / 36

Series RMA-B
close-coupled design
Page 17
9450-055-en Revision 01
TM 9886 Edition 11/2018
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.
♦ Undo the support bracket from the base plate.
The adapter and support bracket are one component
in bearing group 1. In bearing group 2 the support
bracket 183 is attached with 2 hex. screws 901/2 and
contact discs 557/2 to the adapter 346 . With the motor
group TSC from size 280 upwards, the motor has the
support bracket and not the adapter.
If the housing
100 remains in the plant, leave the
housing gasket 401 in the centering to protect the
housing sealing surface.
7.6.1 Removing adapter
♦ Undo screws 901/5 from the connection
bracket/adapter.
♦ Remove adapter
346
from the centering of the
bracket 344 . If necessary, use two levers.
♦ To overcome the axial magnetic forces, pull the
adapter 346 upwards with a firm jerk.
CAUTION! When pulling out the
bearing pedestal, the axial magnetic
forces (up to max. 400 N without weight
force) decrease abruptly after being at
maximum. Risk of accident!
The operating torque of the magnetic coupling
installed is specified on the type plate.
7.6.2 Dismantling motor, adapter and drive
magnet assembly
♦ Undo motor nuts and screws 901/7 .
♦ Remove the screwplug 903/4 from the adapter.
♦ Undo both setscrews 904/1 .
♦ Pull adapter 346 forward.
♦ Pull drive magnet assembly 858 off the motor
shaft.
♦ If the drive magnet assembly is difficult to pull off,
use a release screw. See
Fig. 6
.
A release screw 5/8” – 11 UNC
B motor shaft
Fig. 6
♦ Remove adapter 346 .
7.6.3 Dismantling slide-in unit
♦ Undo housing screws 901/3 .
♦ Screw 2 hex. screws 901/3 into the forcing thread
of the bracket 344 .
♦ Press the housing 100 with the aid of these hex.
screws out of the bracket 344 .
♦ Remove bracket 344 upwards.
♦ Raise can 159 and can insert 158 . As the shaft
222
is introduced tightly into the can insert
158
,
this shaft is automatically removed together with
the thrust ring 510/3 .
Make sure that no parts of the plain
bearing fall. Risk of breakage!.
♦ Remove shaft 222 with thrust ring 510/3 from the
can. Place a suitable tool, e.g. scribing iron,
behind the thrust ring and pull it off applying
force at several positions.
♦ Remove housing gasket 401 .
♦ Raise inner magnet assembly 859 vertically with
the impeller 230 . The wear ring 502/1 is removed
from the housing 100 at the same time.
♦ Remove thrust ring 510/2 using a screwdriver.
♦ Press the bearing bushes 545 and distance ring
504/1 off the impeller from the suction side. Use a
suitable mandrel made of plastic.
Alternatively, the pull-off device can also be used.
See assembly aids in Chapter 10.2 .
♦ Remove anti-torsion insert
566/2
.
♦ The circlip 932/7 must be destroyed to separate
the impeller 230 and inner magnet assembly 859 .
For this purpose, carefully cut the circlip open
with a cutting knife all around the notch.