Richter MNKA Series User manual

INSTALLATION AND OPERATING INSTRUCTIONS
Translation of the original operating instructions
Keep for future use! Read these operating instructions carefully before transport, installation,
operation and maintenance!
Subject to change without prior notice.
Reprinting is generally permitted provided that the source is credited.
© Richter Chemie-Technik GmbH.
9250-003-en Revision 01 Published 06/2022
Series MNKA according to ASME
Sealless
chemical magnetic process pump
Bearing lubrication: Long-life grease and oil bath
Bearing pedestal assembly: 4

Series MNKA bearing pedestal assembly 4 Page 2
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Contents
Contents 2
Associated documents ............................................... 3
1Technical data ....................................................... 3
1.1 Tightening torques..........................................4
1.2 Type plate, dry running, ATEX and housing
marking...........................................................4
1.3 Spare parts.....................................................4
2Safety instructions................................................ 5
2.1 Proper use......................................................5
2.2 Safety instructions for operating
company/operator...........................................6
2.3 Safety instructions for maintenance................ 6
2.4 Unauthorized modification and production of
spare parts......................................................6
2.5 Prohibited operating modes............................ 6
2.6 Special conditions for explosion protection..... 6
2.6.1 Filling the unit....................................... 6
2.6.2 Special operating states....................... 7
2.6.3 Rechargeable liquids ...........................7
2.6.4 Marking................................................7
2.6.5 Direction of rotation check ...................7
2.6.6 Pump operating mode.......................... 7
2.6.7 Temperature limits ............................... 8
2.6.8Maintenance ........................................ 8
2.6.9 Electrically operated peripheral devices8
3Transportation and storage.................................. 9
3.1 Returns...........................................................9
3.2 Disposal..........................................................9
4Product description ............................................ 10
5Setup/installation ................................................ 10
5.1 Safety regulations.........................................10
5.2 Pump/unit setup............................................10
5.3 Aligning the pump—coupling—motor...........10
5.4 Pipelines.......................................................11
5.4.1 Nominal diameter............................... 11
5.4.2 Nozzle loading ...................................11
5.4.3 Suction line ........................................11
5.4.4 Supply line .........................................11
5.4.5 Discharge line.................................... 11
5.4.6 Ventilation and drainage....................12
5.5 Pipeline fittings.............................................. 12
5.6 Monitoring devices........................................12
5.7 Drive .............................................................12
5.8 Coupling........................................................ 13
5.9 Final inspection.............................................13
5.10 Coupling guard .............................................13
5.11 Electrical connection.....................................13
6Commissioning/shutdown ................................. 14
6.1 First commissioning......................................14
6.1.1Filling the pump housing....................14
6.1.2 Startup ............................................... 14
6.2 Operating limits............................................. 14
6.2.1 Abrasive media.................................. 14
6.2.2 Minimum/maximum flow rate............. 14
6.3 Shutdown...................................................... 15
6.4 Restarting ..................................................... 15
6.5 Improper operations and their consequences
(examples).................................................... 15
7Maintenance ........................................................ 16
7.1 Housing screw connections.......................... 16
7.2 Bearing pedestal........................................... 16
7.2.1 Rolling bearings with long-life grease
lubrication........................................... 16
7.2.2 Oil bath lubrication............................. 16
7.3 Cleaning ....................................................... 16
7.4 Standby pumps............................................. 17
7.5 Instructions for dismantling........................... 17
7.5.1 Protective clothing.............................. 17
7.5.2 Magnetic fields................................... 17
7.6 Dismantling................................................... 17
7.6.1 Dismantling the slide-in unit............... 17
7.6.2 Dismantling the drive unit and long-life
lubrication system.............................. 18
7.6.3 Dismantling the drive unit and oil bath
lubrication system.............................. 18
7.7 Instructions for assembly.............................. 19
7.8 Assembly...................................................... 19
7.8.1 Assembly of the drive unit and long-life
grease lubrication............................... 19
7.8.2 Assembly of the drive unit and oil bath
lubrication system.............................. 19
7.8.3 Trial assembly of the slide-in unit....... 19
7.8.4 Assembly of the slide-in unit.............. 20
7.8.5 Final assembly................................... 23
7.8.6 Filling the bearing pedestal with oil.... 24
7.9 Tests............................................................. 24
8Faults 25
9Exploded view drawing....................................... 26
9.1 Long-life lubrication ...................................... 26
9.2 Oil bath lubrication........................................ 27
10 Sectional drawing................................................ 28
10.1 Legend.......................................................... 28
10.2 Sectional drawing ......................................... 29
10.3 Sectional drawing of oil bath lubrication ....... 30
11 Assembly aids..................................................... 31
11.1 Drilling template for housing drain................ 31
11.2 Puller for plain bearing bushes..................... 31
11.3 Universal impeller wrench and universal pump
rotor clamping device.................................... 31

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Associated documents
♦Data sheet
♦Factory certificate
♦Sectional drawing
Long-life grease lubrication 9250-00-3041
Oil bath lubrication 9250-00-3043
♦Dimension sheet 9250-00-3040
♦Installation plan 9250-00-3045
♦Characteristics
♦Spare parts list
♦Operating instructions and declaration of
conformity for the motor*
♦Operating instructions and declaration of
conformity for the coupling*
♦Supplementary installation and operating
instructions for external flushing9230-010-en*
* If included in the scope of delivery
♦Supplementary installation and operating instruc-
tions, version “SAFESEAL©” 9230B025-en*
♦Supplementary installation and operating instruc-
tions, version “SAFERUN©” 9230B020-en*
♦Supplementary installation and operating instruc-
tions, version “Heating jacket” 9000B001-en*
Appendix to the operating instructions
♦Application limits 9230-00-3041
♦Declaration of conformity with ATEX
♦Declaration of conformity without ATEX
♦Form for safety information / safety compliance
declaration QM 0912-16-2001_en
Available on request:
♦Magnetic coupling data TIS 0543-03-0001
♦Document: “Centrifugal pump operation wit-
hout NSPH problems” (Der Kreiselpumpenbe-
trieb ohne NSPH-Probleme)
♦Document: “Safe operation of centrifugal
pumps” (Sichere Betriebsweise von Kreisel-
pumpen)
1 Technical data
Manufacturer:
Richter Chemie-Technik GmbH
Otto-Schott-Str. 2
D-47906 Kempen, Germany
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: http://www.richter-ct.com
Authorized representative in accordance with EC
Machinery Directive 2006/42/EC: Gregor Kleining
Designation:
Single-stage, plastic-lined, magnetic coupling,
chemical centrifugal pump, MNKA bearing pedes-
tal assembly 4, long-life grease and oil bath lubri-
cation
Heavy-duty horizontal design, sealless, eddy
current free
Technical specifications and mounting
dimensions according to
ASME B73.3 M, Table 1, ISO 15783, DIN ISO
5199, and “Hydraulic Institute Sealless Pump
Standards and Referenced Standards”
Flange connection dimensions: ASME B16.5,
class 150/200 or flange drilled to DIN EN 1092-2,
Form B (ISO 7005-2, Form B) PN 16, PN 25
ATEX Directive 2014/34/ EU
Machinery Directive 2006/42/EC
Materials:
Pressurized parts:
Ductile iron ASTM A395 / 5.3103
Carbon fiber composite CFRP
Parts in contact with medium:
PFA, PTFE, PE, SSiC, FFKM,
Also see data sheet.
Flow rate: Up to 1800 US gpm / 400 m3/h
Discharge head: Up to 560 ft / 170 m
Housing end pressure: max. 25 bar
For more details, see application limits.
Temperature range: -76 °F to 392 °F /-60 °C
to +200 °C
Note: For higher pressure and lower or higher
temperature, consult the manufacturer.
Temperature classes: See section 2.6.7.
Permissible ambient conditions for pumps
according to Directive 2014/34/ EU (ATEX):
Ambient temperature range: -4 °F to 140 °F / -20 °C
to +60 °C
(Higher ambient temperatures after consultation with
the manufacturer)
Ambient pressure range: 0.8 barabs to 1.1 barabs
Sizes:
6 x 4 x 13, 4 x 3 x 13, 3 x 2 x 13, 3 x 1.5 x 13
Sound power level:LWA = ≤70 dB
according to DIN EN ISO 9614-2
Weight: See data sheet.
Dimensions: See installation plan

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1.1 Tightening torques
Screws lubricated, tighten crosswise.
Housing screws 901/3
Housing end
pressure
Number x size
Tightening
torque
[DIN/ISO]
[in-lbs]
[Nm]
cl 150
cl 300
PN 16
PN 25
16 x M20
1600
180
Pipeline screws
Flange according to ASME cl 150
DN
Number x size
Tightening torque
[inch]
[mm]
[ASME]
[in-lb]
[Nm]
1½
40
4 x ½“
135
15
2
50
4 x ⅝“
220
25
3
80
4 x ⅝“
400
45
4
100
8 x ⅝“
310
35
6
150
8 x ¾“
670
75
Flange according to ASME cl 300
DN
Number x size
Tightening torque
[inch]
[mm]
[ASME]
[in-lb]
[Nm]
1½
40
4 x ¾“
220
25
2
50
8 x ⅝“
135
15
3
80
8 x ¾“
310
35
4
100
8 x ¾“
400
45
6
150
12 x ¾“
490
55
Flanges according to ASME, drilled according to
DIN/ISO PN16
DN
Number x size
Tightening torque
[inch]
[mm]
[DIN/ISO]
[in-lb]
[Nm]
1½
40
4 x M16
180
20
2
50
4 x M16
270
30
3
80
8 x M16
220
25
4
100
8 x M16
310
35
6
150
8 x M20
620
70
Flanges according to ASME, drilled according to
DIN/ISO PN25
DN
Number x size
Tightening torque
[inch]
[mm]
[DIN/ISO]
[in-lb]
[Nm]
1½
40
4 x M16
180
20
2
50
4 x M16
270
30
3
80
8 x M16
270
30
4
100
8 x M20
450
50
6
150
8 x M24
890
100
1.2 Type plate, dry running, ATEX
and housing marking
The stainless steel type plate is securely riveted
onto the bearing pedestal:
When the operator affixes its marking, make sure
that the pump matches the application required.
Type plate example:
Dry running:
ATEX marking:
Housing marking:
Can be identified on the housing according to DIN
EN 19:
♦Nominal width
♦Nominal pressure
♦Housing material
♦Manufacturer's logo
♦Melt number/foundry mark
♦Casting date
1.3 Spare parts
Spare parts are designed for two years of
continuous operation in accordance with DIN
24296 and in consultation with the manufacturer.
Manufacturer /
Manufacturing country
Series
Size
CE marking
Year of manufacture /
Richter factory no.

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2 Safety instructions
These operating instructions contain basic
information that must be observed during
installation, operation and maintenance.
Read before installation and commissioning!
The operating instructions must always be availa-
ble for reference at the place where the ma-
chine/system is used.
In addition to the general safety instructions listed
under this main item on safety, special safety in-
structions are included in other places and must
be observed.
Installation, operation and maintenance must be
carried out by competent personnel.
The area of responsibility, accountability and
supervision of personnel must be monitored
closely by the operator.
If personnel do not have the necessary
knowledge, they are to be trained and instructed
accordingly. If necessary, this can be carried out
by the manufacturer/supplier on behalf of the ma-
chine’s operator.
General danger symbol! Persons
may be put at risk.
Safety notice! Failure to observe this
may affect the pump and its function.
EU Community symbol! Explosion-
protected equipment must be marked
for work in potentially explosive atmos-
pheres.
Warning of magnetic field!
Warning of electrical voltage!
If persons with pacemakers are at risk,
e.g. due to a strong magnetic field, this
warning sign is included.
Notices attached directly to the pump/unit, for ex-
ample:
♦Direction of rotation arrow
♦Warning against dry running
These must be observed and remain identifiable.
Non-observance of safety instructions may re-
sult in the loss of any claims for damages.
Non-observance of safety instructions may result
in the following hazards:
♦Failure of important functions of the
machine/system.
♦Failure of electronic devices and measuring in-
struments due to magnetic fields.
♦Danger to persons and their personal property
from magnetic fields.
♦Danger to persons from electrical, mechanical
and chemical effects.
♦Danger to the environment from leakage of
dangerous substances.
When using the unit in potentially
explosive atmospheres, the
sections of these operating
instructions marked Ex must be
observed in particular.
2.1 Proper use
The MNK 200-150-315 pump is ais a plastic-lined,
magnetic centrifugal pump for leak-free pumping
of aggressive, toxic, pure and flammable liquids.
The pump is equipped with a permanent magnet
synchronous drive.
The pump is designed for horizontal installation.
Compliance with the specified physi-
cal limits is important for proper func-
tioning and safe operation, especially
with regard to explosion protection to
prevent potential ignition sources (see
section 2.6):
♦It must be ensured that the pump is always
filled with liquid during operation.
♦For safe pump operation, we recommend a
flow rate that is between 0.3 and 1.1 Qopt. In
any case, the maximum working temperature
must not be exceeded. See section 2.6.7. In
case of doubt, consult the manufacturer.
♦In the case of gas contents >2% and solids
contents, the manufacturer must be consulted
to prevent insufficient lubrication and dry run-
ning.
♦The machine NPSH value (NPSHA) should be
0.5 m higher than the NPSH pump value
(NPSHR). See also section 5.4.1.
Improper methods of operation, even
for short periods, can result in serious
damage to the unit.
In terms of explosion protection, potential ignition
sources (overheating, electrostatic and induced
charges, mechanical and electrical sparks) can
result from these improper methods of operation.
This can only be prevented by observing the
proper use.
In this context, reference is also made to Directive
1999/92/EC (“ATEX 137”), which contains mini-
mum requirements to improve the protection of

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health and the safety of workers that could be at
risk from an explosive atmosphere.
This unit must not be operated above
the values specified in the data sheet
with regard to the pumped liquid, flow
rate, speed, density, discharge head
and working temperature as well as
motor power.
Comply with the directions contained in the
operating instructions or contract
documentation; if necessary consult the
manufacturer.
All important characteristics are documented in
the data sheet included in the scope of delivery.
In case of operating conditions other than those
described in the data sheet, check the following
again:
♦Pump design
♦Accessories’ design
♦Resistance of the materials.
2.2 Safety instructions for
operating company/operator
The following must be observed:
♦The safety instructions contained in these op-
erating instructions
♦The existing regulations for the prevention of
accidents
♦This includes internal working, operating and
safety regulations of the operating company.
♦Hot or cold machine parts on site must be
safeguarded against contact.
♦Do not remove any protective deviceswhen the
machine is in operation.
♦Hazards due to electrical energy must be ex-
cluded.
♦Leakages of hazardous media (e.g. explosive,
toxic, hot) must be discharged in a way that
ensures no hazards to persons or the
environment. Legal regulations must be
observed.
Attention when using the units in
potentially explosive atmospheres!
Prevent inadmissible modes of operation.
2.3 Safety instructions for
maintenance
Only perform work on the unit when it is
stationary.
It is essential to observe the shutdown of the unit
described in the operating instructions. See
section 6.3.
Pumps that convey media harmful to health must
be decontaminated.
All safety and protective facilities are to be
reinstalled and made functional immediately on
completion of work.
When the safety instructions are observed
(see also sections 5.1 and 7.5.2), the magnetic
couplings pose no hazard and do not affect the
environment.
During disassembly and assembly
and during transport and storage of
magnetic couplings as individual
parts, it is essential to observe the
safety instructions in section 7.5.2.
Before resuming operation, observe the points
listed in section 6.1.
2.4 Unauthorized modification and
production of spare parts
Modification or alterations to the machine are only
permitted afterconsultation with the manufacturer.
Original spare parts and accessories approved by
the manufacturer serve to ensure safety.
The consequences of using other parts may
negate the manufacturer’s liability as a result.
2.5 Prohibited operating modes
The operational reliability of the machine supplied
is only guaranteed if it is used as intended in ac-
cordance with section 2.1 of the operating in-
structions.
Do not exceed the limits specified in the data
sheet under any circumstances.
2.6 Special conditions for
explosion protection
When using the units in potentially explosive
atmospheres, the measures and instructions in
sections 2.6.1 to 2.6.9 must be observed to
ensure explosion protection.
2.6.1 Filling the unit
During pump operation, the interior of
the pump that comes into contact with
the liquid must be filled with pumped
liquid at all times.
This ensures that there is no explosive atmos-
phere and the risk of running dry is prevented.
If the operator cannot ensure this, we
recommend that appropriate
monitoring measures be provided.
All auxiliary, heating and cooling
systems must also be carefully filled.

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2.6.2 Special operating states
In the standard version, the plain
bearing is lubricated andcooled by the
internal flushing circuit.
Due to properties of the liquid (e.g. sticking due to
inadmissible solids ingress, clogging, gas
ingress), the flushing / cooling flow can be
interrupted, resulting in an inadmissible tempera-
ture rise. Ensure suitable monitoring measures.
See section 5.6.
For safe pumping operation, we recommend a
flow rate of 0.3 to 1.1 QOpt. When operating
outside this range, it must be ensured that the
maximum permissible flow rate according to the
pump characteristic curve is not exceeded and
that the maximum permissible operating
temperature according to section 2.6.7 is
maintained.
If the flow rate is too high, the differential pressure
upstream and downstream of the plain bearing
may be reduced to such an extent that there is a
risk of insufficient lubrication or dry running.
If the flow rate is too low, the medium may heat up
so much due to the fluid friction that the maximum
permissible surface temperature of the
corresponding temperature class is exceeded.
Overloading, overheating or failure to observe the
design data or incorrect selection of the magnetic
coupling can lead to decoupling of the inner and
outer rotors. As a result, eddy currents are in-
duced at the inner or outer rotor and an impermis-
sible temperature rise may occur. Ensure suitable
monitoring measures. See section 5.6.
The machine NPSH value (NPSHA) should be a
minimum 0.5 m higher than the NPSH pump value
(NPSHR) to prevent a lack of lubrication or dry
running of the plain bearing.
2.6.3 Rechargeable liquids
When operating with chargeable
liquids (conductivity <10-8 S/m), purge
with inert gas when draining if the
pump lining is non-conductive. See
section 6.3.
2.6.4 Marking
The Ex marking on the pump refers to
the pump part. A separate declaration
of conformity must be available for the
shaft coupling and motor or for other
attachments, and a corresponding
marking must be present.
Example of the marking on the pump part:
When mounting the pump with non-Ex
components (e.g. motor, shaft coupling), it is
recommended to remove or obscure the Ex
marking on the pump part and, if applicable, other
attachments.
In this case, the declaration of conformity without
ATEX marking applies.
For surface temperatures that mainly depend on
the operating conditions of the pump, DIN EN
ISO 80079-36 Chapter 11.2 f) and g) state that
no temperature class or temperature may be
specified. In this case, the marking must include
temperature range identification (e.g. T4 to T3 for
gas or for dust T135 °C to T200 °C).
The temperature class is to be determined by the
operator according to section 2.6.7 Temperature
limits.
2.6.5 Direction of rotation check
If there is also a risk of explosion during the
installation phase, the direction of rotation check
must never be carried out by briefly switching on
the unfilled pump. This prevents an impermissible
increase in temperature at the plain bearing.
We recommend checking the direction of rotation
only when the coupling is disengaged or with a
rotating field meter! See also section 6.1.2.
2.6.6 Pump operating mode
The pump may only be started with the suction
side shut-off device fully open and the pressure
side shut-off device slightly open. It is also
possible to start the pump against a closed non-
return valve. Immediately after start-up, the
pressure-side shut-off device must be adjusted to
the operating point.
See also section 5.4.1.
Operation with closed shut-off devices in the
suction and/or discharge line is not permitted!
There is a risk of high surface tem-
peratures on the pump housing after
only a short time due to rapid heating
of the liquid inside the pump.
A rapid increase in pressure inside
the pump poses the risk of over-
stressing to the point of bursting.
The pump must not be operated in
an unfilled or partially filled condi-
tion (dry running). This will result
in severe damage to the pump and
may pose additional hazards to the
environment.
Dry running can occur not only if the
interior is not sufficiently filled, but
also if the gas content in the pumped
liquid is too high.

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Operating the pump outside the permissible
operating range can also lead to dry running
(e.g. due to evaporation in the interior).
2.6.7 Temperature limits
In normal operating condition, the highest temper-
atures are to be expected at the shaft seal / shaft
contact point, on the inner rings of the
rolling bearings and at high media temperatures
on the surface of the pump housing.
We draw your attention to the fact
that the surface temperature of the
pump housing is only slightly lower
than the medium temperature.
If the pump is heated (e.g. heating jacket), it must
be ensured that the temperature classes specified
in the plant are observed.
The non-heated pump surface must have clear
contact with the environment.
When operating the pump, ensure that
excessive dust deposits are prevented
(clean regularly if necessary). This
prevents the pump surface from heat-
ing up above the permissible temper-
ature.
Depending on the pump version, Table 1 below
shows the permissible media temperature taking
into account the applicable temperature class as
per DIN EN ISO 80079-36. (Also see the appen-
dix to the operating instructions: Application limits
9230-00-3046)
Table 1
Temperature class
as per DIN EN ISO
80079-36
Limit value of the pumped
liquid temperature
Lining material
PFA/PTFE
Can material2)
CFK-F
T4 (135 °C)
125 °C 1)
T3 (200 °C)
180 °C 3)
1) Permanently greased rolling bearings: no restrictions.
T4 is only valid for operation up to 1750 min-1.
2) The can material is listed in the data sheet.
3) If the temperature of the pumped liquid exceeds 180 °C, the
ATEX approval becomes permanently invalid. The ATEX plate
must be removed immediately by the operator. A new ATEX
approval can only be issued by a judge. For this purpose, the
pump can be sent in for inspection.
The system operator must ensure that the
specified working temperature is maintained.
The maximum permissible temperature of the
pumped liquid at the pump inlet depends on
the respective required temperature class and
the selected lining materials.
2.6.8 Maintenance
For safe and reliable operation, en-
sure that the unit is properly main-
tained and kept in technically perfect
condition by means of regular inspec-
tion intervals.
Example: Rolling bearing function. Operating
mode and operating conditions essentially
determine the bearings’ actual achievable service
life.
Regular checks of the bearing pedestal area can
prevent overtemperatures caused by hot-running
rolling bearings, start-up of the drive rotor at the
lantern or even defective bearing seals. See
section 7.2.
In the case of media containing solids, the mainte-
nance intervals must be determined by the opera-
tor in relation to the operating conditions.
If auxiliary systems (e.g. externalflushing, cooling,
heating) are installed, check if monitoring devices
are necessary to ensure their function.
2.6.9 Electrically operated peripheral
devices
Electrically operated peripheral
devices, such as pressure,
temperature, and flow sensors, must
comply with the applicable safety
requirements and explosion protection
regulations.

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3 Transportation and storage
The pump or pump unit must be
transported properly. Ensure that the
pump/unit remains in a horizontal po-
sition during transportation and does
not slip out of the transport rigging.
A pump or the motor can be attached to the crane
hook eye provided for this purpose.
The transport rigging is not suitable for a complete
unit, i.e. pump with base plate and motor.
In this case, observe the rope attachment points
on the base plate. See Figure 1.
Do not attach the sling ropes to exposed shaft
ends or to the eyebolt of the motor.
Figure 1
Check the delivery for completeness and
transport damage immediately after receipt.
Do not install damaged pumps in the system.
When unpacking single parts of mag-
netic couplings, the corresponding in-
structions in section 7.5.2 must be
observed.
Handle the goods to be transported with care to
prevent damage.
Flange covers serve as transport protection and
must not be removed.
If the unit is not installed immediately after deliv-
ery, store it properly.
Store the pumps in a dry and vibration-free, well-
ventilated room at as constant a temperature as
possible.
Elastomers must be protected against UV
radiation.
As a general rule, do not exceed a storage period
of 10 years. For elastomer made of NBR, the per-
missible storage period is 4 years.
When storing the single parts of mag-
netic couplings, the corresponding in-
structions in section 7.5.2 must be
observed.
In case of extended storage, preservation may be
required on machined component surfaces and
packaging with moisture protection.
3.1 Returns
Pumps that have carried aggressive
or toxic media must be well flushed
and cleaned before returning them to
the manufacturer.
It is mandatory to include safety information / a
safety compliance declaration regarding the
site of application with the return.
Forms are enclosed with the installation and oper-
ating instructions.
Safety precautions and decontamination
measures must be given.
3.2 Disposal
Parts of the pump might be contaminated with a
medium that is harmful to health and the environ-
ment, meaning that cleaning is not sufficient.
Danger topersons or theenvironment
from the medium or oil!
♦Wear protective clothing when work is being
done on the pump.
♦Before disposing of the pump:
♦Collect leaking medium, oil, etc., and dis-
pose of it in accordance with the local reg-
ulations.
♦Neutralize any medium residues in the
pump.
♦Separate the pump materials (plastics, metals,
etc.) and dispose of them in accordance with
the local regulations.

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4 Product description
The housing dimensions, nominal outputs and
technical requirements of the MNKA bearing
pedestal assembly 4 comply with ASME B73.3M,
ISO 15783 / DIN ISO 5199.
The sectional drawing shows the design of the
pump. See section 10.1.
All components that come into contact with the
pumped medium are either encased in plastic or
made of other resistant materials, e.g. silicon car-
bide.
Housing 100 is made of metallic plating and a
plastic liner.
Bearing bushes 545 and axial bearing washers
314 are secured against torsion in the plain bear-
ing pedestal.
Bearing sleeve 529/1 is secured against rotation
in the impeller or 529/2 in the pump rotor.
Can 159 is made of high-strength CFRP (carbon
fiber composite). This is protected against the
pumped medium by can insert 158 made of re-
sistant plastic.
Plain bearing pedestal 339 separates the hydrau-
lic part of the pump from the can area. Both
spaces are connected by flushing holes in the
plain bearing pedestal, creating an internal flush-
ing circuit due to the pressure differences. This
serves to flush or cool the plain bearing.
Oil bath lubrication only:
Bearing pedestal 330 contains radial ball bearings
321/1 and 321/2, which are lubricated by an oil
bath. The oil bath is sealed by shaft seals 421/1
and 421/2 and 412/1 O-ring.
Special designs:
♦A vacuum-tight can unit is created by bonding
the can to the can insert.
The can chamber is also vented and drained via
the holes in the plain bearing pedestal.
Additional information can be found in the
brochure.
5 Setup/installation
5.1 Safety regulations
Devices that are operated in poten-
tially explosive areas must comply
with the explosion protection regula-
tions.
People with pacemakers are at risk
from the strong magnetic field of the
magnetic coupling. Remaining at a
distance of less than 500 mm from the
pump can be potentially fatal for them.
5.2 Pump/unit setup
The structural layout must be prepared according
to the dimensions of the installation plan.
Installation method: On poured base plate and
solid foundation
♦Align the base plate on the ground foundation.
♦Insert the foundation bolts and under fill the
base plate.
♦Only tighten the foundation screws evenly and
firmly after the mortar has set.
If additional installations are mounted,
the stability of the entire unit must be
checked when it is installed without a
foundation.
5.3 Aligning the pump—cou-
pling—motor
The following is for general infor-
mation purposes. Special instructions
for the coupling and motor manufac-
turer must be observed.
After fixing the base plate to the foundation and
connecting the piping, the alignment of the
coupling must be carefully checked and, if
necessary, the unit must be readjusted on the mo-
tor.
♦A coupling check and possible re-alignment is
required even if the pump and motor are sup-
plied and aligned on a common base plate.
♦Before starting the alignment, loosen support
bracket 183 and then tighten it stress-free.
♦The pump must be aligned horizontally (on the
shaft / discharge nozzle) in all directions with
the aid of a spirit level (permissible position de-
viation max. 0.2 mm/m).
♦A distance depending on the coupling used
must be maintained between the pump shaft
and the motor shaft. See installation plan.
♦Place supports in the immediate vicinity of the
foundation / base plate screw connection.
Ensure that the unit cannot be started
up during workif a coupling guard is not
attached.

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5.4 Pipelines
Before installing the pump, clean both the suction
line and supply line as well as the discharge line.
To prevent soiling or damage to the sealing sur-
faces, leave the flange covers on the flanges until
immediately before installation.
Use flange gaskets suitable for the pumped
medium.
For tightening the flange screws, observe the
screw tightening torques in section 1.1.
5.4.1 Nominal diameter
The operating point of a centrifugal pump is at the
intersection of the pump characteristic curve and
the piping characteristic curve, see Figure 2. The
pump characteristic curve is provided by the pump
manufacturer. The pipe characteristic curve is de-
termined by means of diagrams or PC programs.
Figure 2
Under no circumstances can thenominal diameter
of the pipe be determined from the nominal con-
nection diameter of the pump.
As a rough guide, the nominal pipe size can be
determined from the flow velocity.
The velocity in the suction line should not exceed
6.56 ft/s (2.0 m/s) and in the discharge line 16.4
ft/s (5.0 m/s).
The NPSH (net positive suction head) value must
also be considered when determining the nominal
suction line size. The NPSHR value required for
the pump is given in the data sheet.
The NPSHA present in the
system should be at least
1.64 ft (0.5 m) greater than the NPSHR
required for the pump. Otherwise, a drop
in pressure head, cavitation or even
pump failure will occur.
5.4.2 Nozzle loading
The pump can be nozzle loaded according to
ANSI/HI 9.6.2. For values see installation plan.
Temperature-related changes in the length of the
pipeline must be taken into account by suitable
measures, e.g. by installing expansion joints.
5.4.3 Suction line
Lay the suction lines so that they consistently rise
towards the pump. Otherwise, gas bubbles may
form which considerably narrow the suction line
cross-section. Install eccentric transition pieces
between different pipe diameters.
Do not install fittings that interfere with the flow di-
rectly upstream of the pump.
Figure 3
5.4.4 Supply line
Supply pipes should vent towards the tank and
must be laid continuously downward towards the
pump. If the pipe installations are horizontal in
front of the pump, a low point can be arranged in
front of it. From here, the pipe is then laid rising
again to the pump; the gas bubbles that form here
can escape through the pump.
Do not install fittings that interfere with the flow
directly upstream of the pump.
5.4.5 Discharge line
Do not place the shut-off valve directly above the
pump, but first provide a transition piece.
The discharge nozzle velocity of the liquid can be
reduced, if necessary.
)m(A )s/m(Q
)s/m(v 2
3
=
Pump characteristic
curve
Suction line
Pump suction
connection
Operating point
Pipe characteristic curve

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5.4.6 Ventilation and drainage
Venting may be directed into the discharge line or
upstream of the discharge valve.
A vent line can also be a bypass, evacuation or
flushing line.
The pump housing is equipped with a drain port
as standard. Optionally, the drain bore can be
drilled out.
Figure 4
5.5 Pipeline fittings
The following pipeline fittings are available on re-
quest at Richter:
♦Backflow preventer
♦Shut-off devices
♦Sight glasses
♦Inlet tank
♦Dirt traps
♦Manometer
Figure 5
5.6 Monitoring devices
Depending on the requirements for
operational safety and availability of
the unit, appropriate monitoring equip-
ment is recommended.
Richter will provide information about and supply
the following on request:
♦Flow meter
♦Fill level indicator
♦Motor load monitor
♦Temperature monitoring
♦Rolling bearing monitoring
♦Can monitoring
♦Leakage monitoring
♦SAFERUN®pump condition monitoring
On request we will provide you with the
publications “Safe operation of centrifugal pumps”
(Sichere Betriebsweise von Kreiselpumpen) and
“Centrifugal pump operation without NSPH
problems” (Der Kreiselpumpenbetrieb ohne
NSPH-Probleme).
5.7 Drive
The power consumption of the pump at the oper-
ating point is specified in the data sheet or factory
certificate.If the operating pointis not known when
the pump is delivered, the power requirement can
be taken from the corresponding characteristic
curves. Themaximum density, maximum viscosity
and a safety margin must be taken into account.
When selecting the motor size, make sure that the
power surplus is not toolarge, but that therequire-
ments according to ANSI/HI or ISO 5199 are met.
Otherwise, the magnetic coupling could break off
during startup.
The pump data sheet specifies the magnetic cou-
pling power at the required pump speed.
If the motor power exceeds this magnetic coupling
power—at pump speed—a check for magnetic
coupling breakage is required.
Likewise, if the required drive power exceeds 80%
of the magnetic coupling power at pump speed. If
necessary, consult Richter.
By using different speeds, e.g. by means of a fre-
quency converter, different operating data can be
achieved without changing the pump.
The pump with base plate and motor is shown in
the installation plan.
The motor manufacturer’s operating instructions
are to be observed.
If the pump is started directly, i.e. without speed
control by a frequency converter, we recommend
using a soft start in order to prevent magnetic
coupling breakage.
When used in zone 1 and 2, a motor
with valid ATEX approval must be
used.
Discharge line
Ventilation
Drainage
Suction and
supply line

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5.8 Coupling
If one coupling half engages with the other, the
claw part must normally be mounted on the drive
shaft and the coupling half with the smooth face
on the motor shaft.
Observe the operating instructions of the coupling
manufacturer.
When used in zone 1 and 2, a coupling with valid
ATEX approval must be used.
There are regulations in place, for example,for the
following details:
♦Arrangement of the coupling halves
♦Maximum bore diameter
♦Maximum transmittable power
♦Clearance between the coupling halves
♦Maximum values for misalignment and
♦angular deviation.
5.9 Final inspection
Check the alignment of the coupling again
according to section 5.3.
It must be possible to turn the unit easily by hand
at the coupling.
5.10 Coupling guard
According to accident prevention regulations, the
pump may only be operated with a coupling guard.
It must be ensured that the coupling
guard used is either made of
non-sparking material or fulfills the im-
pact resistance test required by EN
13463 without impairment.
Richter offers both variants.
The operator must ensure that the re-
quirements of the Machinery
Directive are met after installation of
the coupling guard.
5.11 Electrical connection
The operator is obliged to connect the unit in
accordance with existing regulations (IEC, VDE,
etc.).
The electrical connection may only be
carried out by a qualified electrician.
Compare the existing mains voltage with the spec-
ifications on the motor type plate and select a suit-
able circuit.
A motor protection device (motor circuit breaker)
is strongly recommended.
There is a risk of explosion if the elec-
trical installation is not carried out cor-
rectly.
In potentially explosive atmospheres,
IEC 60079-14 must also be observed
for the electrical installation.
If the pump is mounted on a base plate, ensure
that an electrical discharge is provided by using a
toothed or contact washer on the housing bracket
and support bracket.
The unit must be grounded in accordance with the
applicable regulations, e.g. at the base plate.

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6 Commissioning/shutdown
6.1 First commissioning
Normally, the pumps have already been test-run
with water. Unless special agreements have
been made, there could still be small amounts of
residual water in the pump. This must be noted in
view of a possible reaction with the medium.
Long-life grease and grease lubrication:
A distinction is made between rolling bearings that
have long-life grease and those that can be relu-
bricated.
♦If there are lubricating nipples on the bearing
pedestal, the rolling bearings must be
relubricated.
See section 7.2.2.
♦Where no lubricating nipples are present, the
rolling bearings are permanently greased. Re-
lubrication is not possible and not
necessary. See section 7.2.1.
♦The rolling bearings have long-life grease.
Relubrication is not possible and not
necessary. For service life, see section 7.2.
Oil bath lubrication:
Fill the bearing pedestal with oil!
For oil type and oil filling, see sections 7.2 and
7.8.5.
6.1.1 Filling the pump housing
♦Check to see whether the screws on the suc-
tion flange, discharge flange, housing flange
and drain flange are tight.
When retightening the housing screws, make
sure that the support bracket is released.
Otherwise, the pump could be put under strain.
For screw tightening torques, see section1.1.
♦Open the suction line fully so that the medium
can flow into the pump.
♦Open the discharge valve so that the air in the
pump can escape.
♦If air cannot be vented into the discharge line,
because a pressure drop in this line is not per-
mitted, for example, venting must be
performed upstream of the discharge valve.
♦Monitor the venting process until no air but only
liquid emerges.
♦Turn the drive shaft at the coupling a few times.
♦Monitor the venting process again until no more
air emerges.
♦Close the discharge valve again to
allow only the minimum flow rate
after the motor has been started.
6.1.2 Startup
♦Check that the drive shaft can be
turned easily by hand.
♦Check the direction of rotation of the motor with
the coupling disengaged or using a rotary field
instrument.
♦Viewed from the motor, the direction of rotation
of the pump is clockwise. See also the direc-
tion of rotation arrow on the pump.
The pump must not run dry during the
direction of rotation check.
♦Check the alignment of the coupling.
♦Install a coupling guard.
The pump must be completely filled
with liquid. The maximum admissible
flow rate must not be exceeded.
Otherwise the plain bearings can run
dry in both cases.
♦Switch on the motor.
Set the required flow by opening the discharge
valve.
If the motor runs but the pump does not
convey, this means that the
magnetic coupling has ruptured.
♦Switch off the motor immediately to prevent
overheating the magnetic rotor.
Then proceed as follows:
♦Close the discharge valve to the “minimum flow
rate” position.
♦Restart the motor.
If the magnetic coupling ruptures again, look for
the cause.
6.2 Operating limits
The operating limits of the pump/unit
in terms of pressure, temperature,
power and speed are entered in the
data sheet and it is imperative to
observe them!
6.2.1 Abrasive media
If liquids with abrasive constituents are
conveyed, increased wear at the pump
is to be expected. In such cases, the
inspection intervals should be reduced
compared to the usual times.
6.2.2 Minimum/maximum flow rate
The generally recommended operating range lies
between 0.3 Qopt to 1.1 Qopt. Consult the
manufacturer for operation outside this range and
observe section 2.6.2.

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6.3 Shutdown
♦Close the discharge valve to the “minimum flow
rate” position.
♦Switch the motor off.
♦Close the discharge valve completely.
Only close the suction line if the pump
is to be drained or dismantled.
For all work on the machine, ensure
that the motor cannot be inadvertently
switched on.
If the pump is to be drained or flushed, observe
the local regulations.
If the pump has been operated with a
chargeable liquid, it must be filled with
inert gas (e.g. nitrogen) during drain-
ing to prevent an explosive atmos-
phere.
It is recommended to wait 1 hour before the pump
is dismantled from the system to allow static
charge peaks to dissipate.
These measures are not necessary for pumps
with a conductive plastic lining.
When returning the pump to the manufacturer,
clean it very thoroughly.
See also section 3.1.
6.4 Restarting
When restarting the pump, make sure that,
depending on the extent of dismantling, all the
appropriate steps are repeated as described in
section 6.1.
6.5 Improper operations and their
consequences (examples)
Improper methods of operation, even
for short periods, can result in serious
damage to the unit.
In terms of explosion protection, potential ignition
sources (overheating, electrostatic and induced
charges, mechanical and electrical sparks) can
result from these improper methods of operation.
This can only be prevented by observing the
proper use.
Pump is started up without liquid:
♦The plain bearing in the pump can be de-
stroyed.
♦Overheating can destroy other pump parts.
Operation with ruptured magnetic coupling:
♦If there is no heat dissipation, damage to the
pump or drive rotor can occur.
Suction line is not opened or not opened
fully:
♦Pump cavitates—material damage to pump
and plain bearings.
♦Pump does not attain the required delivery
head or flow rate.
♦Pump may be destroyed by overheating.
Discharge valve is closed too far:
♦Pump may be destroyed by overheating.
♦Axial thrust too great.
Discharge valve is opened too much:
♦Pump may cavitate. Particularly severe with an
empty discharge line.
♦Risk of pressure surge.
♦Possible damage to the plain bearings.
♦Magnetic coupling may rupture.
♦Motor may be overloaded.
Suction valve and discharge are valve closed:
♦Destruction due to rapid overheating and sharp
rise in pressure.
Control of the pump with the suction valve:
♦Cavitation—the volume may only be regulated
on the discharge side.
Admissible gas content exceeded:
♦The flow may stop.
♦To resume flow, stop the pump and vent it.
♦Make sure that the gas content is not
exceeded as described in the intended use.

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7 Maintenance
7.1 Housing screw connections
After initial loading by the operating pressure and
operating temperature, the tightening torques of
all connection screws are to be checked at the
following points:
♦Housing flange
♦Suction flange
♦Discharge flange
See also section 6.1.1, item 1.
Further checks are to be carried out at regular
intervals depending on the operating
requirements.
7.2 Bearing pedestal
The temperature of the bearing ped-
estal should not exceed 158 °F
(70 °C) and must never exceed
176 °F (80 °C).
In theevent of higher temperatures,take the pump
out of operation immediately and contact qualified
personnel.
In some cases, vibration measurement is
recommended to detect rolling bearing wear in
good time.
7.2.1 Rolling bearings with long-life
grease lubrication
Grease-filled rolling bearings of type 2RS are fit-
ted as standard. The grease is lithium saponified.
The permissible temperature range lies between -
40 °F (-40 °C) and 320 °F (+160 °C).
The rolling bearings are designed for an L10 ser-
vice life of >35,000 hours. The service life of the
grease filling guaranteed by the bearing
manufacturers is shown in the following table.
Size
Bearing size > service life
Group 4
6314-2RS / 15000 hr*
* at bearing temperature <158 °F (<70 °C)
If the pump is serviced, it is recommended that the
bearings are replaced as a precautionary meas-
ure.
In potentially explosive
atmospheres it is advisable to
monitor the condition of the
bearings.
7.2.2 Oil bath lubrication
We recommend a mineral oil with the following
characteristics for an expected bearing pedestal
temperature of up to 158 °F (70 °C):
Viscosity index: Approx. 85
Kinematic viscosity at 104 °F (40 °C):
s2
mm
40.ca
A fully synthetic gear oil to ISO VG 220 is to be
used for temperatures below -68 °F (-20 °C).
Replacing the bearings: The roller bearings are
designed for a service life L10 of >35,000 hours.
We recommend changing the bearings after
35,000 working hours or every 4 years.
Oil change: 1 x per year at bearing pedestal tem-
peratures of up to 158 °F (70 °C).
Every 6 months at bearing pedestal temperatures
of up to 158 °F (70 °C).
More frequently at higher temperatures as speci-
fied.
If the pump is serviced, it is advisable to replace
the bearings and shaft seals as a precautionary
measure and to fill with new oil.
Oil level check: For safe operation, the oil level
must be checked regularly at the 638/1 oil level
controller.
The oil level controller must always contain oil; it
must never be completely empty.
In potentially explosive atmos-
pheres it is advisable to monitor
the condition of the bearings.
If there is any reason to suspect that water spray
may have entered the bearing pedestal, then an
oil change must be carried out immediately. Even
small amounts of water in the oil will reduce the
life of the rolling bearings to a fraction of the nor-
mal life expectancy.
If the pump is serviced, it is advisable to replace
the bearings and shaft seals as a precautionary
measure and to fill with new oil.
7.3 Cleaning
Care must be taken when cleaning the pump to
ensure that it is not exposed to a strong water jet.
The ingress of water into the bearing pedestal
would substantially impair bearing lubrication.

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7.4 Standby pumps
If a pump is on standby, it must be started up from
time to time. Turn the shaft regularly by hand in
the direction of rotation.
In the case of pumps which are exposed to severe
vibrations from the system, this procedure must
be carried out more frequently.
When dismantling the pump from the system,
drain it, clean it thoroughly, seal it with flange
covers and store it in accordance with the
instructions.
7.5 Instructions for dismantling
♦All repair and maintenance work is to be per-
formed by qualified personnel using appropri-
ate tools and original spare parts.
♦Is the necessary documentation available?
♦Has the pump been taken out of operation,
drained and flushed correctly?
See also section 6.3.
♦If reassembly is not performed immediately af-
ter dismantling, the plastic and ceramic com-
ponents in particular must be stored carefully.
7.5.1 Protective clothing
Even if the pump has been properly
drained and flushed, residue of the
medium may still remain in the pump,
e.g. between sealing surfaces, in the
bearing clearances or in the can or
can insert.
Plastic partsmay absorbmedium, which gradually
exudes from the material after flushing.
Proper protective clothing must be
worn.
Protective clothing must be worn even if only the
bearing pedestal is to be removed. Medium may
have leaked through the can into the lantern
chamber.
7.5.2 Magnetic fields
Attention! Strong magnetic fields
Risk during dismantling and in prox-
imity to individual parts of magnetic
couplings.
Remove loose parts and other magnetizable
metals from the workbench. These may otherwise
be attracted: Risk of accident!
Place any tools needed at a safe distance.
Keep electronic equipment and measuring instru-
ments at a distance. If in doubt, consult the equip-
ment manufacturer.
Hold the individual parts of the magnetic
couplings firmly or secure them. Otherwise they
could be attracted, for example, by a vice: Risk of
accident!
People with an artificial pacemaker:
Keep torso at a minimum distance of
20“(500 mm).
For safety’s sake, a distance of 6” (150 mm)
should be observed for watches, electric data
carriers, data carriers with magnetic strips, etc.
7.6 Dismantling
There are three options for dismantling:
1. Removing the complete pump from the plant.
2. Removing the complete slide-in unit; the pump
housing can remain in the plant connected to
the piping.
3. Removing the complete drive unit from the
plant. The pump does not need to be drained.
Dismantling of the complete pump is described here.
For the structure and individual parts of the pump,
see the exploded view drawing in section 9 and
the sectional drawing in section 10.
If the coupling is a removable coupling, the
engine can also stop.
♦Detach support bracket 183 from the base plate.
♦Undo housing screw connection 901/3, 552/3.
♦Remove the complete slide-in unit.
If the housing 100 remains in the plant,
leave the housing gasket 401 in the
centering to protect the housing seal-
ing surface.
ATTENTION!
When pulling out the slide-in unit, this part must be
secured against falling out.
The integrated support rings in the lantern can be
used for this purpose.
Or use the optionally available slide and support
block. See assembly aids in section 11.4.
The torque of the installed magnetic coupling is
specified on the type plate.
7.6.1 Dismantling the slide-in unit
♦Transport the slide-in unit by means of the inte-
grated support rings in the lantern.
Additionally, the supplied ring bolt can be
screwed into the bearing pedestal flange
straight up (“12 o’clock”).
Remove the threaded cap beforehand.
This means two slinging aids are available.
♦Place the slide-in unit on a workbench or work-
top and secure it.
♦Remove fastening screws 901/17 with washers
554/11.
♦Remove the threaded sealing caps from the
threaded holes of the bearing pedestal flange.
Screwin the two M16 assembling threaded rods
supplied.

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♦Using the triangular pyramid on the threaded
rods and an open-end wrench size 13, press
the drive unit out of the lantern chamber.In the
process, turn the threaded rods evenly in al-
ternation.
Attention! Magnetic forces!
Risk of accident!
♦Transport the drive unit by crane. The ring bolt
on the bearing pedestal flange canbe used for
this purpose.
♦Set up the remaining slide-in unit vertically, with
the impeller pointing downwards.
♦Remove screws 901/10 and lift off lantern 344,
can 159 and can insert 158.
♦Clamp plain bearing pedestal 339 at the seal-
ing surfaces in a vice.
To avoid damaging the plastic
sealing surfaces, be sure to use
rubberized clamping jaws.
♦Release impeller 230 and pump rotor 859 by
turning them in opposite directions. Right-
hand thread!
Either two strap wrenches or, better still,
specialist tools (see assembly aid in section
11.3) can be used for this purpose.
For magnetic couplings >3540 in-lb (>400 Nm)
the use of the special tools is
generally recommended.
♦The pump rotor 859 detaches from the pump
shaft 211. The pump shaft is pulled out of the
plain bearing pedestal 339 with the remaining
component.
♦This step must be carried out carefully, as
silicon carbide plain bearing parts may be re-
moved unintentionally.
Make sure that no plain bearing parts
fall off. Silicon carbide fractures ea-
sily.
♦An appropriate Richter device can be used to
remove the 545/1 and 545/2 bearing bushes.
See assembly aids in section 11.2.
♦The can 159 and can insert 158 should only be
separated if a component needs to be
replaced. The separation process can be sim-
plified by cooling the unit to approx. 41 °F
(5 °C).
♦In the case of a vacuum-proof design, separa-
tion of the can unit is not possible because the
can insert and can are bonded together.
7.6.2 Dismantling the drive unit and
long-life lubrication system
♦Remove socket head screw 914/5 with toothed
lock washer 934/4 and pull off the pump rotor
858 from the drive shaft 213. If possible, use a
non-magnetizable tool for this purpose.
Attention! Magnetic forces!
Risk of accident!
♦Remove screws 914/6 and pull off rear bearing
cover 361.
♦Remove wave spring washer 953/1.
♦Pull or press 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 replace the rolling bearings 321/1 and
321/2, push them off the drive shaft 213.
♦Optional
The pump can be equipped with roller
bearings that can be relubricated. In this case,
in bearing pedestal 330 and in rear bearing
cover 361 there is a421/1 and a 421/2 rotary
shaft seal . See section 10.2.
♦The mating surfaces of the shaft seals consist
of chromium oxide coated steel rings which
can be replaced at the factory if necessary.
7.6.3 Dismantling the drive unit and oil
bath lubrication system
♦Remove socket head screw 914/5 with toothed
lock washer 934/4 and pull off the pump rotor
858 from the drive shaft 213. If possible, use a
non-magnetizable tool for this purpose.
Attention! Magnetic forces!
Risk of accident!
♦Remove hexagon screw 901/4 and drain the
oil.
♦Remove screws 914/6 and the rear bearing
cover 361 with shaft seal 421/1 and O-ring
412/1.
♦Remove wave spring washer 953/1.
♦Pull or press 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 replace the rolling bearings 321/1 and
321/2, push them off the drive shaft 213.
♦If necessary, push out the shaft seals 421/1
and 421/2 from bearing pedestal 330 and rear
bearing cover 361.
♦The mating surfaces of the shaft seals consist
of chromium oxide coated steel rings which
can be replaced at the factory if necessary.
♦We recommend replacing the shaft seals 421
each time the bearings are replaced.

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7.7 Instructions for assembly
♦Use original spare parts. See also section 2.4.
♦Never use faulty parts.
♦Has the pump been taken out of operation,
drained and flushed correctly?
See also section 6.3.
♦Coat fitting surfaces and screw threads with
anti-seize special assembly paste (e.g.
Weicon).
♦The thread in impeller 230, pump rotor 859 and
on pump shaft 211 mustnot be greased asthis
would prevent an optimum adhesive bond.
♦Bushes 523/1 in impellers 230 and 523/2 in
pump rotor 859, O-rings 412 and housing gas-
ket 401 and shaft seals 421 in the case of oil
bath lubrication should always be
replaced.
♦Important dimensions of centerings, bearing
fits or bearing clearances should be checked
before final assembly. If necessary, carry out
a trial assembly.
♦For the structure and individual parts, see the
exploded view drawing in section 9 and the
section drawing in section 10.
♦Magnetic components such as the 859 pump
rotor and 858 drive rotor must be cleaned of
adhering metallic particles before assembly.
Simple plasticine can be used for this
purpose.
♦A complete assembly is described below. Sub-
sections can be derived from it.
7.8 Assembly
7.8.1 Assembly of the drive unit and
long-life grease lubrication
♦Press rolling bearings 321/1 and 321/2 onto
drive shaft 213.
♦Slide the drive shaft unit into bearing pedestal
330, fit the wave spring washer 953/1 and the
rear bearing cover 361, and tighten all
components using the cap screws 914/6. Tor-
que 133 in-lb (15 Nm)
♦Set up the bearing pedestal unit vertically and
secure it (e.g. in a vice).
♦Fix drive rotor 858 with the flat pivot point on
drive shaft 213.
Attention! Magnetic forces!
Risk of accident!
♦Insert toothed lock washer 934/4 and tighten
cap screw 914/5 to a torque of 40 Nm.
If possible, use a non-magnetizable tool for
this purpose.
7.8.2 Assembly of the drive unit and oil
bath lubrication system
♦Screw hexagon screw 901/4 into bearing ped-
estal 330.
♦Insert shaft seal 421/2 into bearing pedestal
330.
♦Insert shaft seal 421/2 and O-ring 412/1 into
rear bearing cover 161.
♦Press rolling bearings 321/1 and 321/2 onto
drive shaft 213.
♦Slide the drive shaft unit into bearing pedestal
330, fit the wave spring washer 953/1 and the
rear bearing cover 361, and tighten all compo-
nents using the cap screws 914/6. Torque 133
in-lb (15 Nm).
♦Set up the bearing pedestal unit vertically and
secure it (e.g. in a vice).
♦Fix drive rotor 858 with the flat pivot point on
drive shaft 213.
Attention! Magnetic forces!
Risk of accident!
♦Insert toothed lock washer 934/4 and tighten
cap screw 914/5 to a torque of 40 Nm.
If possible, use a non-magnetizable tool for
this purpose.
7.8.3 Trial assembly of the slide-in unit
♦Without adhesive
♦Without O-rings 412/3, 412/4
♦For assembly, see section 7.8.3.
♦Dismantle the test-assembled unit and carry
out assembly.

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7.8.4 Assembly of the slide-in unit
Assembly aids:
The following slings are required for mounting
the slide-in unit:
♦3 eye bolts (M10)
♦1 sling chain with 3 chains
♦Optional: Puller for plain bearing bushes
(9237-89-1138)
Assembly of the slide-in unit:
♦Mount O-ring 412 with FDA-compliant grease,
e.g. Rivolta F.L.G. GT-2.
♦Push shaft sleeve 523/x over drive shaft 230.
♦Apply two drops of Loctite 638 (green) to the
thread of impeller shaft 230, apply
FDA-compliant grease to the fits, e.g. Rivolta
F.L.G. GT-2.
♦Mount plain bearing pedestal 339 and bearing
bushes 529/x and apply corrosion protection
CRC-SP 400II to plain bearing pedestal 339.
♦Insert bearing sleeve 545/x on the impeller side.
♦In the case of aplain bearing pedestal with bay-
onet lock, bring the plain bearing bush into po-
sition by turning the puller counterclockwise so
that the bearing isaxially fixed according to the
bayonet principle.
♦
Caution! Dry running
If necessary, spray the ceramic com-
ponent with Lexo spray (soapy wa-
ter).