Richter MNK Series - Manual (Page 19)

Series MNK 200-150-315
Page 19
9230-053-en Revision 12
TM 8195 Edition 03/2011
7.6.3 Dismantling the drive unit
Oil bath lubrication
Remove the hex. socket screw 914/5 with the lock
washer 934/4 and pull the drive magnet assembly
858 off the drive shaft 213. For this purpose do not
use any magnetisable tools.
Caution! Magnetic forces!
Risk of accident !
Remove hex. screw 901/4 and drain oil.
Remove hex. socket screws 914/6 and pull off the
rear bearing cover 361 with the rotary shaft seal
421/1 and O-ring 412/1.
Remove wavy spring washer 953/1.
Pull or push the drive shaft 213 with the rolling
bearings 321/1 and 321/2 out of the bearing
pedestal 330 in the direction of the motor.
To change the rolling bearings 321/1 and 321/2,
they have to be pushed off the drive shaft 213.
If necessary, press the rotary shaft seals 421/1
and 421/2 out of the bearing pedestal 330 and rear
bearing cover 361.
The mating running surfaces of the rotary shaft
seals are made of chromium-oxide-coated steel
rings which can be replaced by the manufacturer if
required.
We recommend you to also replace the rotary
shaft seals 421 when the bearings are being
replaced.
7.7 Notes on assembly
Use original spare parts. See also Section 2.4.
Do not use 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 the fitting surfaces and screw thread
prior to assembly.
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.
The bushes 523/1 in the impeller 230 and 523/2 in
the inner magnet assembly 859, the O-rings 412
and the housing gasket 401 as well as the rotary
shaft seals 421 should always be replaced.
Important dimensions on centrings, bearing fits or
bearing play must be checked prior to final
assembly. If necessary, perform a trial assembly.
For the design and single components, see
exploded drawing in Section 9 and sectional
drawing in Section 10.
Many metallic particles adhering to magnetic
components such as the inner magnet assembly
859 and drive magnet assembly 858 must be
removed prior to assembly. For this purpose
simple plasticene can be used..
A complete assembly process is described in the
following. Sub-sections can be deduced from this.
7.8 Assembly
7.8.1 Assembly of drive unit
Long life grease and grease
lubrication
Press radial ball bearings 321/1 and 321/2 onto the
drive shaft.
Push drive shaft unit into the bearing pedestal 330,
mount wavy spring washer 953/1 and rear bearing
cover 361 and tighten all components with the hex.
socket screws 914/6. (Torque 15 Nm)
Optional
The drive unit can be provided with rotary shaft
seals (421/1 and 421/2). (Grease lubrication with
regreasable rolling bearings). In this case a rotary
shaft seal must be pressed into the bearing
pedestal 330 and one into the rear bearing cover
361.
Position bearing pedestal unit vertically and secure
(e.g. in a vice).
Secure drive magnet assembly 858 on the drive
shaft 213 on the flat pivot point.
Caution! Magnetic forces!
Risk of accident !
Insert wavy spring washer 934/4 and tighten the
hex. socket screw 914/5 to a torque of 40 Nm. For
this purpose, do not use any magnetisable tools if
at all possible.
7.8.2 Assembly of drive unit
Oil bath lubrication
Screw hex. screw 901/4 into the bearing pedestal
330.
Insert rotary shaft seal 421/2 into the bearing
pedestal 330.
Insert rotary shaft seal 421/2 and O-ring 412/1 into
the rear bearing cover 161.
Press rolling bearings 321/1 and 321/2 onto the
drive shaft 213.
Push drive shaft unit into the bearing pedestal 330,
mount wavy spring washer 953/1 and rear bearing
cover 361 and tighten all components with the hex.
socket screws 914/6. (Torque 15 Nm)
Position bearing pedestal unit vertically and secure
(e.g. in a vice).