Richter SCK Series User manual

INSTALLATION AND OPERATING MANUAL
Translation of the original manual
Keep for future use!
This operating manual must be strictly observed before
transport, installation, operation and maintenance
Subject to change without notice.
Reproduction is generally permitted with indication
of the source.
© Richter Chemie-Technik GmbH
9220-001-en Revision 14 Edition 01/2021
Series SCK
Chemical Drive Pump
for Mechanical Seals
Bearing lubrication: Grease and Oil bath
Bearing pedestal group: 1+2+3

Series SCK Page 2
9220-001-en Revision 14
TM 10272 Edition 01/2021
List of Contents
List of Contents...............................................2
Relevant documents.......................................3
1Technical data ...........................................4
1.1 Tightening torques.......................................4
1.2 Type plate, dry-running, ATEX- and housing
markings......................................................5
1.3 Spare parts..................................................5
2Safety .........................................................6
2.1 Intended use................................................6
2.2 For the customer/operator...........................7
2.3 For maintenance..........................................7
2.4 Conversion work and production of spare
parts by the customer..................................7
2.5 Improper operation ......................................7
2.6 Special requirements for explosion protection
7
2.6.1 Filling the unit.................................................. 7
2.6.2 Special operating conditions ...........................7
2.6.3 Chargeable liquids..........................................7
2.6.4 Identification....................................................8
2.6.5 Check of the direction of rotation..................... 8
2.6.6 Mode of operation of the pump .......................8
2.6.7 Temperature limits..........................................8
2.6.8 Maintenance...................................................9
2.6.9 Electric peripheral equipment..........................9
3Transport and storage and disposal......10
3.1 Return consignments.................................10
3.2 Disposal.....................................................10
4Product description.................................11
4.1 Housing......................................................11
4.2 Back plate..................................................11
4.3 Impeller......................................................12
4.4 Shaft sleeve...............................................12
4.5 Bearing pedestal........................................12
4.6 Mechanical seals.......................................12
5Installation ...............................................13
5.1 Safety regulations......................................13
5.2 Installation of pump/unit.............................13
5.3 Alignment of pump-coupling-motor ...........13
5.4 Piping.........................................................13
5.4.1 Nominal size................................................. 13
5.4.2 Nozzle loads................................................. 14
5.4.3 Suction line................................................... 14
5.4.4 Supply line.................................................... 14
5.4.5 Discharge line............................................... 14
5.4.6 Venting and evacuating................................. 14
5.5 Pipe fittings................................................14
5.6 Monitoring facilities....................................15
5.7 Drive ..........................................................15
5.8 Coupling.....................................................15
5.9 Final check ................................................15
5.10 Coupling guard..........................................15
5.11 Electric connection....................................15
6Commissioning/Shutdown .....................16
6.1 Initial commissioning.................................16
6.1.1 Mechanical seals...........................................16
6.1.2 Filling the pump housing ...............................16
6.1.3 Start-up.........................................................16
6.2 Operating limits .........................................16
6.2.1 Abrasive media.............................................16
6.2.2 Min./max. flow rate........................................16
6.3 Shutdown ..................................................16
6.4 Restarting..................................................17
6.5 Improper operations and their consequences
(examples).................................................17
7Maintenance.............................................18
7.1 Screw connections of the housing ............18
7.2 Bearing pedestal .......................................18
7.2.1 Grease lubrication.........................................18
7.2.2 Oil bath lubrication ........................................18
7.3 Mechanical seals.......................................19
7.4 Cleaning ....................................................19
7.5 Stand-by pumps........................................19
7.6 Notes on dismantling.................................19
7.6.1 Protective clothing.........................................19
7.7 Dismantling................................................19
7.7.1 Dismantling the slide-in unit...........................19
7.7.2 Dismantling the mechanical seal...................20
7.7.3 Dismantling the shaft sleeve..........................20
7.7.4 Dismantling the back plate ............................20
7.7.5 Dismantling the bearing pedestal long life grease
lubrication .....................................................20
7.7.6 Dismantling the bearing pedestal oil bath
lubrication .....................................................21
7.8 Changing the radial ball bearings..............21
7.8.1 Grease lubrication.........................................21
7.8.2 Oil bath lubrication ........................................21
7.9 Notes on assembly....................................22
7.10 Assembly...................................................22
7.10.1 Fill bearing pedestal with oil ..........................22
7.11 Tests..........................................................22
8Faults23
9Sectional drawing....................................24
9.1 Legend ......................................................24
9.2 Sectional drawing SCK long life grease
lubrication..................................................25
9.3 Sectional drawing SCK oil bath lubrication26
10 Assembly aids.........................................27
10.1 Impeller wrench for open impeller SCK.....27
10.2 Impeller nut for bearing pedestal 3............27
10.3 Assembly cone for SCK lip rings...............27

10.4 Clamping device for SCK single mechanical
seals..........................................................27
10.5 Boring template for housing drain .............28
Relevant documents
Data sheet
Works certificate
Installation and operating manual for mechanical
seals, depending on design:
External single mechanical seal 9220B010-en*
Stationary single mechanical seal RG-4
9220B011-en*
Stationary single mechanical seal RG-4
quenched 9220B012-en*
Double mechanical seal to DIN EN 12756
9220B013-en*
Stationary double mechanical seal RG-4,
liquid sealed 9220B014-en*
Supplementary Installation and Operating Manual,
vortex pump *9230B011-en*
Supplementary Installation and Operating Manual,
„self-priming“ design * 9230B012-en*
Supplementary Installation and Operating Manual,
„ heating jacket “ 9000B001-en *
Sectional drawing SCK
Long life grease lubrication
Group 1 + 2 9220-00-3005
Group 3 9220-00-3007
Oil bath lubrication
Group 1 + 2 9220-00-3006
Group 3 9220-00-3008
Installation drawing
Dimensional drawing SCK 9220-00-3030
* if contained in the scope of delivery
Dimensional drawing drain connection *
9220-00-3022
Dimensional drawing drain connection *
Size 150-125-315 9220-00-3023
Dimensional drawing temperature monitor *
9220-00-3026
Performance curves
Spare parts list
Operating manual and declaration of conformity
motor *
Operating manual and declaration of conformity
coupling *
Operating manual mechanical seal of the
manufacturer
Appendix to the operating manual
Operational limits see 9200-00-3030
Declaration of conformity with ATEX
Declaration of conformity without ATEX
Form for Safety Information Concerning the
Contamination QM 0912-16-2001_en
On request :
Publication : Mechanical seals for solids-laden and
crystallizing media
Publication : "Centrifugal Pump Operation without
NPSH Problems"
Publication "Safe Operation of Magnetic Drive
Pumps“

Series SCK Page 4
9220-001-en Revision 14
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1 Technical data
Manufacturer :
Richter Chemie-Technik GmbH
Otto-Schott-Str. 2
D-47906 Kempen
Telephone: [phone]
Fax: [phone]
E-Mail: [email protected]m
Internet: http://www.richter-ct.com
Authorised person acc. to machinery directive
2006/42/EG: Gregor Kleining
Designation:
Single-stage, plastic-lined, chemical centrifugal pump,
series SCK, grease and oil bath lubrication, for
mechanical seals
Heavy-duty horizontal design
Technical specifications to ISO 15783 and DIN ISO
5199
Connecting dimensions to ISO 2858 / DIN EN 22858
Flange connecting dimensions:
DIN EN 1092-2, shape B (ISO 7005-2, shape B)
PN 16 or flanges drilled to ASME B16.5 Class 150
ATEX Directive 2014/34/EU
Machine Directive 2006/42/EC
Materials:
Pressurized parts :
ductile cast iron EN-JS 1049 / ASTM A395
Mechanical seal housing made of stainless steel
Wetted parts:
Lining: PFA, PTFE, PE-UHMW,
anti-static lining (PFA/PTFE conductive)
and see data sheet.
Flow rate: up to 300 m3/h (at 2900 min-1)
Delivery head: up to 110 m LC (at 2900 min-1)
Housing discharge pressure: max. 16 bar
detailed data see operational limits
Temperature range : - 60 °C to + 180 °C
Note: Consult the manufacturer for higher pressures
and lower or higher temperatures.
Temperature classes: see Section 2.6.7
Noise pressure level : LWA = ≤ 70 dB acc. to
DIN EN ISO 9614-2
Admissible ambient conditions for pumps
acc. to directive 2014/34/EU (ATEX) :
Ambient temperature range: -20 °C to +60 °C
Ambient pressure range: 0,8 barabs to 1,1 barabs
Noise capacity level : LWA = ≤ 70 dB acc. to
DIN EN ISO 9614-2
Size:
Group 1
Group 2
Group 3
25-25-160
80-50-250
125-100-250
50-32-160
80-50-315
150-125-315
80-50-160
125-80-200
50-32-200
125-100-200
65-40-200
80-50-200
Weight : See data sheet
Dimensions: See installation drawing
1.1 Tightening torques
Screws greased, tighten in diametrically opposite
sequence
Housing screws 901/3
Size
No. x size
Tightening torque
[mm]
[DIN/ISO]
[Nm]
25-25-160
6 x M 10
45
50-32-160
6 x M 10
45
80-50-160
6 x M 10
45
50-32-200
8 x M 12
45
65-40-200
8 x M 12
45
80-50-200
8 x M 12
45
80-50-250
8 x M 12
60
80-50-315
12 x M16
95
125-80-200
8 x M 12
60
125-100-200
8 x M 12
60
125-100-250
12 x M 12
60
150-125-315
12 x M 12
60
Pipe screws, flanges to DIN/ISO
DN
No. x size
Tightening torque
[mm]
[DIN/ISO]
[Nm]
25
4 x M 12
10
32
4 x M 16
15
40
4 x M 16
20
50
4 x M 16
26
65
4 x M 16
40
80
8 x M 16
25
100
8 x M 16
35
125
8 x M 16
45
150
8 x M 20
65

Series SCK Page 5
9220-001-en Revision 14
TM 10272 Edition 01/2021
Pipe screws, DIN/ISO flanges drilled to ASME
DN
No. x size
Tightening torque
[mm]
[inch]
[ASME]
[Nm]
in-lbs
25
1“
4 x ½“
8
70
32
1¼“
4 x ½“
12
105
40
1½“
4 x ½“
15
135
50
2“
4 x ⅝“
25
220
65
2½“
4 x ⅝“
30
265
80
3“
4 x ⅝“
45
400
100
4“
8 x ⅝“
35
310
125
5“
8 x ¾“
55
485
150
6“
8 x ¾“
80
710
1.2 Type plate, dry-running, ATEX-
and housing markings
The stainless steel type plate is firmly riveted to the
housing:
If the operator attaches his identification, it must be
ensured that the pump matches the application in
question.
Example of type plate:
ATEX marking :
Housing identification :
The following are visible on the housing according to
DIN EN 19:
Nominal size
Rated pressure
Housing material
Manufacturer's identification
Melt number/Foundry identification
Cast date
1.3 Spare parts
Spare parts for two years of continuous operation in
accordance with DIN 24296 and in consultation with the
manufacturer.

Series SCK Page 6
9220-001-en Revision 14
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2 Safety
This operating manual contains fundamental
information which is to be observed during installation,
operation and maintenance.
It must be read before installation and
commissioning.
This operating manual must always be available at the
place of use of the machine/plant.
In addition to the general notes on safety under the
main heading “Safety”, special notes on safety are
included at other points and must be observed.
Installation, operation and maintenance are to be
performed by qualified staff.
The area of responsibility, authority and supervision of
the staff must be exactly regulated by the customer.
If the staff does not have the necessary expertise, they
are to be trained and instructed. If necessary, this can
be provided by the manufacturer/supplier on behalf of
the machine operator.
General hazard symbol! People may be put
at risk.
Safety symbol! The pump and its function
may be put at risk if this safety symbol is not
observed.
EU marking! Explosion protected equipment
must be identified for work in potentially
explosive areas.
Warning of electric power!
It is imperative to observe signs attached directly to the
pump / unit, e.g.:
Direction of rotation arrow
Warning against dry-running
and they are to be kept legible.
Non-observance of the notes on safety may result
in the loss of any and all claims for damages.
Non-observance may involve the following hazards:
Failure of important functions of the machine/plant.
Risk to people from electric, mechanical and
chemical effects.
Risks to the environment through leaks of
hazardous substances.
If the unit is used in potentially explosive areas,
special attention is to be paid to the sections
identified with “Ex” in this operating manual.
2.1 Intended use
Richter pumps of the series SCK are plastic-lined
centrifugal pumps for the conveyance of aggressive,
toxic, pure and inflammable liquids.
Vertical installation of the pumps is only possible with
pumps with grease-lubricated ball bearings or ball
bearings with oil mist lubrication. Please consult the
manufacturer.
The observance of the specified physical limits
is important for perfect functioning and safe
operation, especially with regard to explosion
protection to prevent potential sources of ignition (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
which lies between 0.3 and 1.1 Qopt. The maximum
operating temperature must never be exceeded.
See Section 2.6.7. In case of doubt, you must
consult the manufacturer.
The manufacturer must be consulted in the event of
entrainment of gas >2% as well as solids in order to
avoid a lack of lubrication and dry-running.
The plant NPSH value (NPSHA) should be 0.5 m
higher than the NPSH value of the pump (NPSHR).
See also Section 5.4.1.
Improper operation, even for a short period,
may result in serious damage to the unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) may
result from these improper operation; their occurrence
can only be prevented by adhering to the intended use.
Furthermore, reference is made in this connection to
the Directive 1999/92/EG („ATEX 137“) which contains
the minimum regulations for improving the
occupational health and safety of the workers who may
be at risk from an explosive atmosphere.
This unit must not be operated above the
values specified in the data sheet as regards
the fluid to be conveyed, flow rate, speed,
density, delivery head and operating temperature as
well as the motor rating.
The operating manual of the mechanical seal
manufacturer in particular must be examined with
regard to the maximum medium temperature limit and
a comparison be made with the medium temperature
limits indicated in the table in Section 2.6.7.
The instructions contained in the operating manual
or contract documentation must be observed; if
necessary consult the manufacturer.
All important features are documented in the data sheet
included in the scope of delivery.
In the event of operating conditions other than those
described in the data sheet, the following are to be
checked again:
design of the pump
design of the accessories
resistance of the materials.

Series SCK Page 7
9220-001-en Revision 14
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2.2 For the customer/operator
The following must be observed:
The notes on safety contained in this operating
manual,
the prevailing regulations on accident prevention,
in-house work, operating and safety regulations of
the customer.
Hot or cold machine parts must be protected by the
customer against being touched.
No protective facilities may be removed when the
machine is in operation.
Hazards due to electricity are to be excluded.
Leaks of hazardous media (e.g. explosive, toxic,
hot) must be removed so that no risk arises for
people and the environment. The statutory
provisions are to be observed.
Caution when using the units in potentially
explosive area! Improper operation must be
prevented.
2.3 For maintenance
In principle, work on the unit may only be performed
when it is at a standstill.
It is imperative to observe the procedure for stopping
the machine described in this operating manual. See
Section 6.3.
Pumps which convey media which are a health hazard
must be decontaminated.
All safety and protective facilities must be remounted or
enabled immediately after the end of work.
The points listed in Section 6.1 must be followed
before recommissioning.
2.4 Conversion work and
production of spare parts by
the customer
Conversion of or changes to the machine are only
admissible after consultation with the manufacturer.
Original spare parts and accessories authorised by the
manufacturer serve to enhance safety.
The use of other parts may annul the liability for any
resultant consequences.
2.5 Improper operation
The operational safety of the machine supplied is only
guaranteed if it is used properly in accordance with
Section 2.1 of this operating manual.
The operating limits specified in the data sheet must
under no circumstances be exceeded.
2.6 Special requirements for
explosion protection
If the units are used in potentially explosive areas, the
measures and notes in Sections 2.6.1 to 2.6.9 are
imperative to guarantee the explosion protection.
2.6.1 Filling the unit
During pump operation the wetted interior of
the pump must always be filled with the liquid
medium.
This prevents any explosive atmosphere and the risk of
dry-running.
If the customer cannot ensure this, we recommend that
appropriate monitoring facilities be provided.
All auxiliary, heating and cooling systems must
also be carefully filled.
2.6.2 Special operating conditions
The pump is normally used to convey
aggressive and inflammable liquids.
To ensure safe pump operation, we recommend you to
observe a flow rate of 0.3 up to 1.1 QOpt. If operation is
outside this range, it must be ensured that the max.
admissible flow rate according to the pump
characteristic is not exceeded and the max. operating
temperature according to Section 2.6.7 is observed.
If the flow rate is too high, there is a risk that the
pressure in the area of the mechanical seal falls until
the vapour pressure of the fluid is undershot. As a
result, this may lead to dry-running, particularly with the
single mechanical seals, involving inadmissible
overheating and the destruction of the mechanical seal.
If the flow rate is too low, the medium may heat up so
much due to the fluid friction that the max. admissible
surface temperature of the relevant temperature class
is exceeded.
Overloading, overheating or non-observance of the
design data can result in Improper operation and it is
therefore imperative to avoid them.
Help can be provided by appropriate monitoring
facilities. See Section 5.6.
The plant NPSH value (NPSHA) must be 0.5 m higher
than the NPSH value of the pump (NPSHR to prevent
damage to the pump).
2.6.3 Chargeable liquids
For operation with chargeable liquids with a
conductivity < 10-8 S/m inert gas must be used
for flushing during evacuation if the lining of the
pump is non-conductive. See Section 6.3.

Series SCK Page 8
9220-001-en Revision 14
TM 10272 Edition 01/2021
2.6.4 Identification
The identification on the pump relates to the
pump section including mechanical seal. For
classification in a certain temperature class,
the data in the operating manuals of the mechanical
seal manufacturer and of the pump manufacturer are
to be matched for each individual application.
A separate declaration of conformity must be provided
for the shaft coupling and motor and for other
attachments as well as corresponding identification.
Example of the identification of the pump section:
For assembling the pump with components which are
not explosion-protected (e.g. motor, shaft coupling), it
is recommended to mask or remove the "potentially
explosive" identification from the pump component
and, if necessary, from other accessories.
In this case the declaration of conformity applies
without ATEX identification.
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
identification must include temperature range
identification (e.g. T4 ... T3 for gas or for dust D135 ° C
... T200 ° C).
The temperature class must be determined by the
operator in accordance with Section 2.6.7
“Temperature Limits”.
2.6.5 Check of the direction of rotation
If there is also a risk of explosion during the
installation phase, the check of the direction of
rotation must under no circumstances be conducted by
briefly switching on the unfilled pump in order to
prevent an inadmissible rise in temperature at the
mechanical seal.
We recommend you to only perform a check of
the direction of rotation with the coupling
disengaged or with a rotating field instrument.
See also Section 6.1.3.
2.6.6 Mode of operation of the pump
The pump may only be started with the suction side
shut-off element fully opened and the discharge side
shut-off element slightly opened. Start-up against a
closed check valve is also possible. The discharge side
shut-off element is to be regulated to the operating
design point directly after run-up.
See also Section 5.4.1.
Operation with closed shut-off elements in the
suction and/or discharge lines is not permitted!
There is a risk that even after a short time high
surface temperatures on the pump housing
may occur owing to rapid heating of the liquid in the
pump interior.
A rapid rise in the pressure inside the pump
involves the risk of overloading to the point of
bursting.
The pump must not be in operation in the unfilled
or partially filled state (dry running). This
results in serious damage to the pump and
additional risks to the environment can
arise. Dry-running cannot only occur with an
insufficiently filled interior but also in the event
of high gas contents in the liquid medium.
Operation of the pump outside the admissible operating
range may also lead to dry-running (e.g. due to
evaporation in the interior).
2.6.7 Temperature limits
In normal operating mode the highest
temperatures are to be expected on the shaft
seal (only with oil lubrication), on the inner
races of the ball bearings and at high medium
temperatures on the surface of the pump housing.
We would like to point out that, under extreme
operating (medium temperature > 160°C) and
ambient conditions (ambient temperature
>30 °C), temperatures of over 130°C may arise on the
surface of the pump housing.
In the case of media >40° C the surface temperature
of the pump housing is generally lower than the
temperature of the medium as the plastic lining acts as
insulation.
If the pump is heated (e.g. heating jacket), it must be
ensured that the temperature classes prescribed in the
annex are observed.
The not heated pump surface must have free contact
with the environment.
During operation of the pump it must be
ensured that excessive deposits of dust are
prevented (regular cleaning) in order to
prevent the pump surface from heating to above the
admissible temperature.
The plant customer must ensure that the
prescribed operating temperature is observed. The
maximum admissible temperature of the liquid
medium at the pump inlet depends on the
temperature class and the selected lining material
required in each case.

The following table contains the resultant theoretical
limit values of the temperature of the liquid medium
allowing for the temperature classes according to DIN
EN ISO 80079-36.
Temperature
class as per
DIN EN ISO
80079-36
Limit value of the pumped liquid
temperature
PE-UHMW
PFA/PTFE
T4 (135 °C)
90 °C 1)
130 °C 1)
T3 (200 °C)
90 °C
180 °C 2)
Note : If the operating manual of the mechanical seal
demands a lower medium temperature than indicated
in the above table, this lower medium temperature is
decisive.
1) Long life grease lubrication: no restriction.
Oil bath lubrication: standard version with shaft seal T3
labyrinth seal (special design) T4
2) Consult the manufacturer for higher limit values.
If different temperature classes (e.g. pump T4,
mechanical seal T3) arise when one medium is used
for pumps and the mechanical seal, the lower
temperature class (in the above example T3) applies to
the entire pump including the mechanical seal.
Observance of the temperature class T4 with oil bath
lubrication is not possible with the standard shaft seal.
A labirinth seal must be used instead of the shaft seal
for the temperature class T4 and with oil lubricated ball
bearings.
2.6.8 Maintenance
For safe and reliable operation, it must be
ensured with regular inspection intervals that
the unit is properly serviced and kept in a perfect
technical condition.
Example: Functioning of the ball bearings. The mode
of operation and operating conditions largely determine
the actual service life that can be attained.
Regular checks of the bearing pedestal area can
prevent excessive temperatures due to hot-running ball
bearings, or even defective bearing seals. See Section
7.2.
In regard to media containing solids, the maintenance
intervals must be set by the operator in accordance
with the conditions of operation.
If auxiliary systems (e.g. cooling, heating) are installed,
a check must be made to see whether monitoring
facilities are required to safeguard their operation.
2.6.9 Electric peripheral equipment
Electric peripheral equipment, e.g. pressure,
temperature and flow sensors etc. must
comply with the prevailing safety requirements
and explosion protection provisions.

Series SCK Page 10
9220-001-en Revision 14
TM 10272 Edition 01/2021
3 Transport and storage and disposal
The pump or the unit must be transported
properly. It must be ensured that during
transport the pump/unit remains in the
horizontal position and does not slip out of the transport
suspension points.
A pump or motor can be suspended from the ring bolt
provided for this purpose.
The suspension points are not suitable for transporting
a complete unit, i.e. pump with base plate and motor.
In this case, the slinging points for the ropes on the
base plate are to be used. See Fig. 1.
The slinging ropes must not be attached to free shaft
ends or to the ring bolt of the motor.
Fig. 1
Directly after receipt of the goods, the consignment
must be checked for completeness and any in-
transit damage.
Damaged pumps must not be installed in the plant.
Handle goods carefully to prevent damage.
Flange covers serve as protection during transport and
must not be removed.
If the unit is not installed immediately after delivery, it
must be put into proper storage.
The product should be stored in a dry and vibration-
free, well ventilated room at as constant a temperature
as possible.
Elastomers are to be protected against UV light.
In general, a storage period of 10 years should not be
exceeded. An admissible storage period of 4 years
applies to elastomers made of NBR.
In the case of prolonged storage conservation agents
on machined component surfaces and packing with a
desiccant may be necessary.
3.1 Return consignments
Pumps which have conveyed aggressive or toxic media
must be well flushed and cleaned before being returned
to the manufacturer's works.
It is imperative to enclose a safety information sheet
/ general safety certificate on the field of application
with the return consignment.
Pre-printed forms are enclosed with the installation and
operating manual.
Safety precautions and decontamination methods are
to be mentioned.
3.2 Disposal
Parts of the pump may be contaminated with medium
which is detrimental to health and the environment and
therefore cleaning is not sufficient.
Risk of personal injury or damage to the
environment due to the medium or oil!
Wear protective clothing when work is performed on
the pump.
Prior to the disposal of the pump:
▪Collect any medium, oil etc. which has escaped
and dispose of it in accordance with the local
regulations.
▪Neutralise any medium residues in the pump.
Separate 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 ratings and technical
requirements of the pump series SCK correspond to
ISO 2858 / DIN EN 22858 / DIN ISO 5199. The
technical requirements of the VDMA 24279 are
satisfied.
The sectional drawings shows the design of the pump.
See Section 9.
Additional information for the pump is provided in the
brochure.
All components which come into contact with the
medium are either plastic-lined or made of other
resistant materials, e.g. silicon carbide.
The pump consists of the assemblies:
Housing, back plate, impeller, shaft sleeve, bearing
pedestal, shaft gasket and mechanical seal (separate
manual).
4.1 Housing
The metallic shell gives the plastic lining of the housing
100 the necessary stability.
Optionally, the housing can be fitted with a drain (see
Section 5.4.6) or heating. This is shown in the data
sheet or in a separate technical document.
4.2 Back plate
The replaceable back plate is standard. If a vacuum
can occur in the pump due to the plant, a so-called
"anchored back plate” has to be used.
The replaceable back plate 161 consists of the
metallic cover 160, the back plate insert 168, a two-
piece ring 501 and circlip 932/4. These parts can
also be replaced by the customer.
The cover 160 is held in the back plate insert 168
by a 2-piece ring 501. A circlip 932/4 holds the 2-
piece ring together. See Fig. 2.
Fig. 2
It is not possible to replace the plastic lining in the
customer's workshop in the case of the anchored
back plate 161. See Fig. 3.
Fig. 3
There is an anchored back plate 161 for the
mechanical seal RG-4. See Fig. 4.
Fig. 4
For the sizes of group 3 the RG-4 back plate 161
can be replaced and is vacuum-proof. See Fig. 5.
Fig. 5

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4.3 Impeller
For strength reasons the impeller 230 has a metallic
core inside with which is it screwed onto the shaft 210.
A locking unit 930/1 is installed between the impeller
and the shaft in groups 1 and 2 as an anti-torsion
insert. With group 3 the impeller is self-holding.
4.4 Shaft sleeve
To protect the shaft 210 against corrosion, the section
between the impeller and the shaft gasket is protected
with a shaft sleeve 524 made of a hard, corrosion-
resistant material.
A plastic lining is provided at the bearing points in the
shaft sleeve made of non-metallic materials in order to
permit a safe transition to the metallic shaft.
4.5 Bearing pedestal
Grease lubrication
The bearing 321/2 on the motor side is designed as a
fixed bearing and that on the pump side as a floating
bearing 321/1.
A rear bearing cover 361 is installed on the motor side
as additional protection. Grease is provided between
the rear bearing cover and the bearing as corrosion
protection. An additional seal can be installed.
Oil bath lubrication
The bearing 321/2 on the motor side is designed as a
fixed bearing and that on the pump side as a floating
bearing 321/1.
A rear bearing cover 361, which accomodates a rotary
shaft seal 421/1 and an O-ring 412/1 for oil sealing, is
installed on the motor side..
A so-called labyrinth disc 555 is installed on the pump
side.
It has several functions:
The grease layer protecting the front bearing is held
back.
Any medium emerging from the mechanical seal is
kept away from the bearing.
Cup springs 950/1, which press the shaft sleeve 524
against the impeller 230 are inserted in order to seal
at that location.
It serves as a running surface when an additional
seal ring is installed.
4.6 Mechanical seals
Designs:
Single mechanical seal
external
internal
Single mechanical seal with lip seal and distance
sleeve
Double mechanical seal to DIN EN 12756
Mechanical seal suitable for solids
Lip seal
See the relevant installation and operating manuals of
Richter or the mechanical seal manufacturer.

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5 Installation
5.1 Safety regulations
Equipment which is operated in potentially
explosive areas must satisfy the explosion
protection regulations.
5.2 Installation of pump/unit
The structural work must be prepared in accordance
with the dimensions in the installation drawing.
Method of installation on a grouted base plate and
firm foundation:
➢Align base plate on the ground foundation.
➢Insert foundation bolts and grout base plate.
➢Do not tighten the foundation bolts uniformly and
firmly until the mortar has set.
Other possibilities of installing the pump are:
4-point installation
4-point installation with base plate.
As soon as additional installations are
mounted, the stability of the entire unit
installed without a foundation must be
checked.
5.3 Alignment of pump-coupling-
motor
The following information is of a general nature.
If necessary, special notes of the coupling and
motor manufacturer are to be observed.
After attachment of the base plate on the
foundation and connection of the pipes, the
alignment of the coupling must be carefully
checked and, if necessary, the unit re-aligned with the
motor.
➢A coupling check and possible re-alignment is also
necessary if the pump and motor are supplied on a
common base plate and aligned.
➢Prior to alignment undo the support bracket 183 and
then tighten it without stress.
➢The pump is to be aligned in all directions using a
spirit level (on shaft/discharge nozzle) (admissible
position deviation max. 0.2 mm/m).
➢A distance depending on the coupling used is to be
observed between the pump and motor shafts. See
installation drawing.
➢Use supports in the direct vicinity of the bolts
foundation/base plate.
Ensure that the unit cannot be started during
work without the coupling guard.
5.4 Piping
Before the pump is installed, both the suction and
supply lines as well as the discharge line are to be
cleaned.
Dirt or damage to the sealing surfaces is best avoided
if the flange covers remain on the flanges until just
before installation.
Use flange gaskets suitable for the media.
The screw tightening torques in Section 1.1 are to be
observed for tightening the flange screws.
5.4.1 Nominal size
The operating design point of a centrifugal pump lies at
the intersection of the pump curve and the pipe curve,
see Fig. 6. The pump curve is provided by the pump
manufacturer. The pipe curve is determined using
diagrams or PC programs.
Fig. 6
Under no circumstances can the nominal size of the
piping be derived from the connected nominal size of
the pump.
The pipe nominal size can also be determined using
the flow rate as a rough guide.
The velocity in the suction line should not exceed
2.0 m/s and 5.0 m/s in the discharge line.
When determining the suction line nominal size, the
NPSH value (net positive suction head) must also be
observed. The NPSHR value required for the pump is
specified in the data sheet.
The NPSHR available in the plant
should be at least 0.5 m higher than
the NPSHR required for the pump.
Otherwise, this will lead to a drop in the delivery head,
cavitation or even failure of the pump.
v m s Q m s
A m
3
2
( / ) = ( / )
( )

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5.4.2 Nozzle loads
The pump can be subjected to nozzle loads acc. to DIN
EN ISO 5199.
Changes in the length of the piping caused by
temperature are to be allowed for by appropriate
measures, e.g. the installation of expansion joints.
5.4.3 Suction line
The suction lines must always be laid on a rising
gradient towards the pump. Otherwise, gas bubbles
may form which considerably reduce the suction line
cross section. Eccentric transition elements must be
installed between different pipe diameters.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
Fig. 7
5.4.4 Supply line
Supply lines should vent towards the reservoir and are
therefore to be laid with a constant downward gradient
towards the pump. Should the piping internals
upstream of the pump be horizontal, a low point can, of
course, be located upstream of these internals. From
here the pipe is then laid with an upward gradient to the
pump so that the gas bubbles which form here can
escape through the pump.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
5.4.5 Discharge line
Do not arrange the shut-off valve directly above the
pump but initially provide a transition section.
The discharge nozzle velocity of the medium can –if
necessary –be reduced.
5.4.6 Venting and evacuating
Venting can take place into the discharge line or
upstream of the discharge valve.
A venting line can also be used as a bypass, drain or
flushing line.
The pump housing is fitted with a drain connection as
a standard feature. Optionally, the drain bore can be
drilled. Boring template see Section 10.5.
Fig. 8
5.5 Pipe fittings
The following pipe fittings are available from Richter on
request :
Shut-off valves
Check valves
Sight glasses
Priming vessels
Strainers
Pressure gauges
Fig. 9

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5.6 Monitoring facilities
Appropriate monitoring facilities are to be
recommended, depending on the requirements
placed on operational safety and availability of
the unit.
Richter provides information on request and can
supply:
Flow meters
Filling level indicators
Motor load monitors
Temperature monitors
Ball bearing monitors
Leak monitors
You can obtain the publications "Safe Operation of
Magnetic drive Pumps" and "The Operation of
Centrifugal Pumps without NPSH Problems" on
request.
5.7 Drive
The power consumption of the pump at the operating
design point is specified in the data sheet and works
certificate. If the operating design point was not known
when the pump was dispatched, the power
consumption can be read off the appropriate
performance curves. The max. density, the max.
Viscosity, power allowances for the relevant
mechanical seal and a safety margin are to be allowed
for.
Care must be taken when selecting the motor size to
ensure that the excess power is not too great but that
the requirements acc. to ISO 5199 are satisfied.
Different operating data can be achieved without
changing the pump through the use of different speeds,
e.g. by means of a frequency converter.
The pump with base plate and motor is illustrated in the
installation drawing.
The operating manual of the motor manufacturer must
be observed.
A motor with a valid Atex certificate is to be
used if employed in zone 1 and 2.
5.8 Coupling
If one coupling half engages with the other, the claw
section is normally to be mounted on the pump shaft
and the coupling half with the smooth end face on the
motor shaft.
Observe the operating manual of the coupling
manufacturer.
A coupling with a valid Atex certificate is to be
used if deployed in zone 1 and 2.
Regulations exist, e.g. for the following details:
Arrangement of the coupling halves
Max. bore diameter
Max. transmitted power
Spacing of the coupling halves
Maximum values for offset and angular
misalignment.
Should the pump housing and motor remain on the
base plate for repair work, a spacer type coupling is
required.
5.9 Final check
Check the alignment of the coupling again in
accordance with Section 5.3.
The operator must ensure that, after the coupling
protection has been mounted, the requirements of the
machine guideline are fulfilled.
5.10 Coupling guard
The pump may only be operated with a coupling guard
in accordance with the accident prevention regulations.
It should be ensured that the coupling
protection used either consists of non-sparking
material or fulfills the impact resistance test
required by DIN EN ISO 80079-36 without any
problem.
Richter offers both versions.
The operator must ensure that, after the coupling
protection has been mounted, the requirements of the
machine guideline are fulfilled.
5.11 Electric connection
The operator is obligated to connect the assembly in
accordance with existing regulations 8 (IEC, VDE, etc.).
Only have the electric connection performed
by a qualified electrician. Compare the
existing mains voltage with the indications on
the motor’s manufacturer’s nameplate and choose a
suitable circuit.
A motor protection device (motor-circuit switch) is
urgently recommended.
Danger of explosion if the electrical
installation is incorrect.
In areas at risk of explosion, IEC 60079-14
must also be observed for the electrical
installation.
If the pump is mounted on a base plate, ensuring
electrical conduction through the use of a chopper disk
or contact disk on the housing foot and support bracket.
The assembly must be grounded in accordance with
currently effective regulations, for example, on the base
plate.

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6 Commissioning/Shutdown
6.1 Initial commissioning
Normally, the pumps have already been test-run with
water. Unless special agreements have been made,
there could still be residual amounts of water in the
pump. This must be noted in view of a possible reaction
with the medium.
Long life grease lubrication
The ball bearings are greased for life. Regreasing
is not possible and not necessary.
For service lives, see Section 7.2.
Oil bath lubrication:
Pour in oil into the bearing pedestal!
For procedure and the oil grade, see Sections 7.2 and
7.8.5.
6.1.1 Mechanical seals
The design and material combination are specified in
the data sheet.
The proper condition of the components and
the protective facilities must be ensured to
prevent any risk from escaping medium.
The regulations and recommendations of the
mechanical seal manufacturer must always be
observed.
See relevant installation and operating manual for the
mechanical seal.
6.1.2 Filling the pump housing
➢Check to see whether the screws of the mechanical
seal and all flange connections are tightened. When
retightening the housing screws, make sure that the
support bracket is undone. Otherwise, the pump
could be deformed.
For screw tightening torques see Section 1.1.
➢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, e.g. a
drop in pressure in this line is not permitted, venting
must be performed upstream of the discharge valve.
➢Monitor the venting operation until no air but only
liquid emerges.
➢Monitor the venting operation again until no more air
emerges.
➢Close the discharge valve again until
only the minimum flow rate is obtained
after the motor has been started.
6.1.3 Start-up
➢Check the direction of rotation of the motor with a
rotary field instrument.
➢As viewed from the motor, the direction of rotation
of the pump is clockwise. See also the direction of
rotation arrow of the pump.
➢If no rotary field instrument is available, the motor
can be switched on briefly with the pump filled so
that it does not run up. Observe the direction of
rotation through the fan hood.
The pump must not run dry during the
check of the direction of rotation.
➢Check alignment of the coupling.
➢Mount coupling guard.
The pump must be completely filled with
liquid. The maximum admissible flow rate
must not be exceeded.
➢Switch the motor on.
➢Set the desired flow by opening the discharge valve.
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. The inspection intervals should be
reduced compared with the usual times.
6.2.2 Min./max. flow rate
The operating range generally recommended
lies at 0.3 Qopt to 1.1 Qopt. Consult the
manufacturer for operation outside this range
and observe Section 2.6.2.
6.3 Shutdown
➢Close discharge valve down to the position
"minimum flow rate"
➢Switch motor off.
➢Close discharge valve completely.
Only close the suction line if the pump is to be
evacuated or dismantled.

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For all work on the machine, make sure that the motor
cannot be inadvertently switched on.
If the pump is to be evacuated 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) to prevent an explosive
atmosphere.
It is recommended to wait one hour before the pump is
dismantled from the plant to permit static peak charges
to be eliminated.
These measures are not necessary with pumps with a
conductive plastic lining.
If the pump is returned to the manufacturer's, clean the
pump very thoroughly.
See also Section 3.1.
6.4 Restarting
When the pump is restarted, it must be ensured that all
the relative steps as described in Section 6.1 are
repeated, depending on the progress of the shutdown
operation.
6.5 Improper operations and their
consequences (examples)
Improper operation, even for a short time, can
result in serious damage to the unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) may
result from these Improper operation; their occurrence
can only be prevented by adhering to the intended use.
Pump is started up without medium :
The mechanical seal in the pump may be destroyed.
Other pump components may be destroyed due to
overheating.
Suction line not opened or not opened fully :
Pump is cavitating –material damage to pump and
plain bearings
Pump does not attain the required delivery head or flow
rate.
Pump may be destroyed due to overheating.
Discharge valve closed too much :
Pump may be destroyed due to overheating.
Excessive shaft deflection with consequences for
the mechanical seal.
Excessive bearing load with consequences for the
bearing service life.
Discharge valve opened too much :
Pump can cavitate. Particularly severe with an
empty discharge line.
Risk of pressure surge.
Motor may be overloaded.
Suction valve and discharge valve closed :
Destruction due to rapid overheating and sharp rise
in pressure.
Control of the pump with the suction valve :
Pump is cavitating –material damage to pump and
plain bearings
The suction valve is closed with the pump at
a standstill :
Possible damage to the mechanical seal because
another pump can generate a pressure for which
the mechanical seal is not rated.
Overrun of the admissible gas content :
The flow may stop.
Switch pump and vent off for renewed conveyance.
Make sure that the gas content is not exceeded, as
described in the intended use.
Pumps with quench or pressurisation
system :
Pump is started up without quench or
pressurisation system :
The mechanical seal on the atmosphere side is
already destroyed after a few revolutions.
Pump is started up with too low a sealing
liquid pressure :
The process medium can enter the liquid seal
system and destroy the metallic parts of the
mechanical seal.
Too high pressure of the quench medium :
The wetted O-ring can be pressed into the process
medium.
Sealing liquid consumption too high :
Is the pump not running smoothly?
Can a leak be seen on the mechanical seal
housing?
Does the leak come from a static sealing point?
Or from a sliding surface on the atmosphere
side?
Or from connection points of the supply or
discharge lines?
If no exterior leak is visible, the missing sealing
liquid enters the product. Repair the wetted
mechanical seal.

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7 Maintenance
7.1 Screw connections of the
housing
After initial loading by the operating pressure and
operating temperature the tightening torques of all
connection screws must be checked at the following
points:
housing/bearing pedestal
suction flange
discharge flange
See also Section 6.1.2, para. 1.
Further inspections are to be conducted at regular
intervals in line with the operating requirements.
7.2 Bearing pedestal
The temperature of the bearing pedestal is not
to exceed more than 70 °C and under no
circumstances 80 °C.
If higher temperatures do occur, call in qualified staff
without delay. If this is not possible, the pump must be
shut down and taken out of service.
In many cases a vibration measurement is
recommended to detect bearing wear in good time.
7.2.1 Grease lubrication
Grease-filled rolling bearings of type 2RS are fitted as
standard. The grease based on polyurea thickener and
ester oil has the designation WT. The permissible
temperature range lies between -40°C and +160°C.
The roller bearings are designed for a service life L10
of >35,000 hours. The service life of the grease
filling guaranteed by the bearing manufacturers is
shown in the following table. Depending on the
degree of contamination, the service life of the
grease is reduced.
Size
Bearing size > Operating time
Group 1
6308-2RS WT / 35000 h *
Group 2
6311-2RS WT / 35000 h *
Group 3
6314-2RS WT / 35000 h *
* at bearing temperature < 70 °C
If the pump is serviced, it is recommended to also
replace the bearings as a precaution.
The ball bearings contain a grease seal as protection
against corrosion. The works provides lithium-
saponified grease, e.g. SKF, type FL or equivalent.
Fig. 10
In potentially explosive works it is
advisable to monitor the condition of
the ball bearings.
7.2.2 Oil bath lubrication
We recommend a mineral oil with the following
characteristics for an expected bearing temperature up
to 70 °C:
Viscosity index :
85.appr
Kinematic viscosity at 40 °C :
s2
mm
40.appr
A fully synthetic gear oil to ISO VG 220 is to be used
for temperatures below –20
Replacing the bearings: The ball bearings are
designed for an L10 service life of >35.000 hours.
We recommend after 35.000 hours operating hours,
or every 4 years and for pumps of groups 2
+ 3 with a speed ≥ 2,900 min-1 after 3 years.
to change the bearings.
Oil changes: 1x per year at bearing temperatures up
to 70 °C.
At higher temperatures more frequently in accordance
with the regulations.
When the pump is serviced, it is recommended to
replace the bearings and shaft seals as a precaution
and to pour in fresh oil.
Oil level check: The oil level is to be regularly checked
on the constant level oiler 638/1 to ensure safe
operation.
It must be ensured that there is always oil in the
constant level oiler; it must under no circumstances be
completely drained.
In potentially explosive works it is
advisable to monitor the condition of
the ball bearings
If there is a suspicion that splash water could have
entered the bearing pedestal, the oil must be replaced
immediately. Even small amounts of water in the oil
reduce the service life of the ball bearings to a fraction
of the normal service life.
If maintenance work is required, it is recommended to
also replace the bearings as a precaution and fill in new
oil.

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7.3 Mechanical seals
The regulations of the mechanical seal manufacturer
must always be observed.
See also the relevant supplementary installation and
operating manual for mechanical seals.
7.4 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 will
substantially impair bearing lubrication.
7.5 Stand-by pumps
If a pump is on stand-by, it is to be started up from time
to time. Regularly turn the shaft by hand in the direction
of rotation.
This operation is to be performed more often for pumps
which are exposed to very strong vibrations from the
plant.
When dismantling the pump from the plant, drain it,
thoroughly clean it, seal with flange covers and store in
accordance with the instructions.
7.6 Notes on dismantling
All repair and maintenance work is to be performed
by skilled staff using appropriate tools and original
spare parts.
Is the necessary documentation available?
Has the pump been taken out of operation,
evacuated and flushed correctly? See also Section
6.3.
If no new assembly is performed immediately after
dismantling, the plastic and ceramic components in
particular must be stored carefully.
The ceramic parts are relatively easy fragile; with
the plastic components the soft sealing surfaces in
particular are to be protected.
If the diameter of a plastic impeller is to be reduced,
it must be remembered that there is a metallic core
in the impeller which is not resistant to the medium.
The table of the machined diameters of plastic
impellers is to be observed. In case of doubt only
machine the area of the vanes.
7.6.1 Protective clothing
Even if the pump has been properly evacuated
and flushed, residue of the medium may still
remain in the pump, e.g. between sealing
surfaces and within the mechanical seal.
Plastic components may absorb medium which
gradually emerges from the material after flushing.
Proper protective clothing is to be worn.
Protective clothing is also to be worn even if only the
bearing pedestal is to be removed. Medium may
penetrated the lantern chamber through the can.
7.7 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.
If the coupling installed is a spacer-type coupling, the
motor can also remain in the plant.
➢Undo support bracket 183 from the base plate
➢Undo housing screws 901/3, 552/3
➢Remove entire slide-in unit
If the housing remains in the plant, leave the
housing gasket 401 in the centering to protect
the housing sealing surface.
Dismantling can be checked using the sectional
drawing in Section 9.2 and the components available.
7.7.1 Dismantling the slide-in unit
➢Clamp the slide-in unit in the vice.
It is imperative to use clamping jaws with an
aluminium surface.
Bearing pedestal group 3:
The labyrinth disc 555 must be secured with
two bolts prior to the dismantling of the
impeller. For this purpose thera are 2 bores Ǿ5
mm in the bearing pedestal. The mechanical seal is
pressure-relieved as a result. See Fig. 11.
Fig. 11 Long life grease lubrication

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Fig. 12 Oil bath lubrication
➢Undo impeller 230 with a strap wrench or assembly
wrench. Right-hand thread!
For assembly aid for impeller, see Section 10.1.
The impeller is dismantled before or during
dismantling of the mechanical seal, depending on the
type of mechanical seal.
After removing the impeller 230, the locking unit 930/1
becomes visible (only with groups 1 + 2).
The one half of the locking unit is generally seated
firmly on the impeller and the other half firmly on the
shaft.
If these parts are still in good condition, they are best
left assembled. If one or both locking unit halves
has/have to be removed, it/they may have to be
destroyed with a chisel.
7.7.2 Dismantling the mechanical seal
See the supplementary installation and operating
manual for the respective mechanical seal version:
External single mechanical seal 9220-060-en
Stationary single mechanical seal RG-4 9220-061-en
Stationary single mechanical seal RG-4
quenched 9220-062-en
Double mechanical seal to DIN EN 12756
9220-063-en
Stationary double mechanical seal RG-4,
liquid sealed 9220-064-en
Stationary double mechanical seal RG-5,
quenched and liquid sealed 9220-065-en
and/or operating manual of the mechanical seal
manufacturer.
7.7.3 Dismantling the shaft sleeve
The dismantling of the shaft seal is described in the
installation and operating manual of the respective
mechanical seal type.
7.7.4 Dismantling the back plate
The dismantling of the housing back plate is described
in the installation and operating manual of the
mechanical seal type.
➢A replaceable back plate 161 can be dismantled
after removal of the circlip 932/4 and the 2-piece
ring 501.
➢The anchored back plate 161 cannot be
dismantled.
7.7.5 Dismantling the bearing pedestal
long life grease lubrication
➢Bearing pedestal groups 1 and 2:
Remove O-ring 412/2 and labyrinth disc 555.
➢Bearing pedestal group 3:
The bolts may only be removed when the
labyrinth disc 555 is pressure-relieved.
➢Screw assembly aid impeller nut instead of impeller
230 slowly onto the shaft end, press cup springs
950/1 completely together. Remove bolts. Unscrew
assembly aid. The labyrinth disc 555 and the O-ring
412/2 can now be removed.
See Fig. 11.
For assembly aid, see Section 10.2.
➢Remove cup springs 950/1.
➢Remove disc 550/1.
➢Remove motor-side circlip 932/3 and rear bearing
cover 361; a groove is provided in it to facilitate
dismantling.
➢Remove circlip 932/2.
➢Remove disc 550/2 (only with bearing pedestal
group 3).
➢The shaft 210 with the radial ball bearing 321/1 is
pressed on a press towards the pump side out of
the bearing pedestal.
➢The key 940/4 (only with bearing pedestal group 3)
can remain in the shaft.
➢The shaft 210 with the radial ball bearing 321/1 is
pressed on a press towards the pump side out of
the bearing pedestal.