Richter RMA-B Series (ASME) - Manual (Page 17)

Series RMA-B close-coupled design Page 17
9475-055-en Revision 14
TM 8256 Edition 06/2011
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 plugs from the adapter.
Undo setscrew 904/1.
Pull adapter 346 forward.
Pull drive magnet assembly 858 off the motor shaft
using a pulling-off device.
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 with bearing pedestal
gasket 404 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.
Press impeller 230 out of the seat of the inner
magnet assembly 859. For this purpose, clamp
the inner magnet assembly 859 in a vice, being
careful not to damage the surfaces, and press the
impeller 230 out towards the suction side.
Alternatively, the dismantling device can also be
used. See assembly aids in Chapter 10.3.
Carefully remove the remaining parts of the circlip
932/7.
7.6.4 Dismantling housing/shaft spider
Pull shaft spider 338 out of the housing seat.
Remove the two anti-torsion inserts 566/1.
Remove shaft sleeve 523/1 from the shaft spider
338.