Grundfos CR 95 Operating instructions

CR, CRN 95 to 255
50/60 Hz
Service instructions
GRUNDFOS INSTRUCTIONS

CR, CRN 95 to 255
English (GB)
Service instructions ........................................................................4
3
Table of contents

English (GB) Service instructions
Original service instructions
Table of contents
1. General information ........................4
1.1 Hazard statements..........................4
1.2 Notes ..................................4
1.3 Safety .................................5
1.4 Contaminated products .......................5
1.5 Servicing the motor .........................5
2. Preparing the dismantling of the product ..........5
2.1 Lifting the product ..........................5
3. Dismantling and assembling the product ..........6
3.1 Motor and coupling .........................6
3.2 Shaft seal, motor stool, pump head cover, sleeve and
chamber stack ............................6
3.3 Thrust-handling device ......................10
4. Renewing thrust-handling-device wear parts .......12
4.1 Chamber stack ...........................12
5. Renewing chamber wear parts ................16
5.1 Neck ring (45)............................16
5.2 Bush (47c) and retaining ring (47d) ...............18
6. Renewing shaft seal wear parts ...............18
6.1 Dismantling .............................18
6.2 Assembly ..............................19
7. Additional information .....................20
7.1 Torques ...............................20
7.2 Lubricants ..............................20
7.3 Special service tools........................21
7.4 Order of assembly for chambers and impellers........23
7.5 Drawings...............................24
8. Document quality feedback ..................30
1. General information
Read this document before you install the product.
Installation and operation must comply with local
regulations and accepted codes of good practice.
1.1 Hazard statements
The symbols and hazard statements below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
DANGER
Indicates a hazardous situation which, if not avoided, will
result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
The hazard statements are structured in the following way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in Grundfos installation
and operating instructions, safety instructions and service
instructions.
Observe these instructions for explosion-proof products.
A blue or grey circle with a white graphical symbol
indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with a
black graphical symbol, indicates that an action must not
be taken or must be stopped.
If these instructions are not observed, it may result in
malfunction or damage to the equipment.
Tips and advice that make the work easier.
4
English (GB)

1.3 Safety
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply before you start any work
on the product.
‐Make sure that the power supply cannot be switched
on accidentally.
WARNING
Falling objects
Death or serious personal injury
‐Follow the lifting instructions.
‐Use lifting equipment which is approved for the weight
of the product.
‐Keep the product in a stable and fixed position when
working on it.
‐Persons must keep a safe distance to the product
during lifting operations.
‐Wear personal protective equipment.
For lifting instructions, see the instructions provided with the
product.
WARNING
Corrosive liquids
Death or serious personal injury
‐Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
‐Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
‐Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
‐Make sure that no one can accidentally come into
contact with hot or cold surfaces.
We recommend that you repair pumps with motors of 7.5 kW and
up at the pump site. Necessary lifting equipment must be available.
1.4 Contaminated products
CAUTION
Biological hazard
Minor or moderate personal injury
‐Flush the pump thoroughly with clean water and rinse
the pump parts in water after dismantling.
The product will be classified as contaminated if it has been used
for a liquid which is injurious to health or toxic. If you request
Grundfos to service the product, contact Grundfos with details
about the pumped liquid before returning the product for service.
Otherwise, Grundfos can refuse to accept the product for service.
Any application for service must include details about the pumped
liquid.
Clean the product in the best possible way before you return it.
Costs of returning the product are to be paid by the customer.
1.5 Servicing the motor
Grundfos MG and MGE motors
Service documentation is available in Grundfos Product Center at
http://product-selection.grundfos.com/.
Motors of other makes
Contact the motor manufacturer.
2. Preparing the dismantling of the product
2.1 Lifting the product
Lifting procedures are described in the installation and operating
instructions. Use the QR code or link below:
http://net.grundfos.com/qr/i/99078486
5
English (GB)

3. Dismantling and assembling the product
Parts are indicated by numbers and refer to the drawings in the
section on drawings.
Tools are indicated by letters and refer to the section on special
service tools.
Related information
7.3 Special service tools
7.5.1 Overview of drawings
7.5.2 Exploded views
7.5.3 Sectional views
3.1 Motor and coupling
3.1.1 Removal
1. Disconnect the power supply and remove the power cable.
2. Remove screws (7a) and coupling guards (7).
3. Remove screws (9) and coupling halves (10a). It may be
necessary to gently loosen the coupling halves with a plastic
hammer.
4. Remove the cylindrical pin (10) from the pump shaft (51).
5. Attach approved lifting equipment to the motor to prevent it from
falling before proceeding with any further dismantling. For
correct attachment of lifting equipment, see instructions supplied
with the pump.
6. Remove the screws (28), washers (32) and nuts (36).
7. Carefully lift the motor off the pump using approved lifting
equipment. For lifting the motor correctly, see the instructions
supplied with the pump.
3.1.2 Installation
1. Carefully lift the motor onto the motor stool (1a) using approved
lifting equipment.
2. Install the screws (28), washers (32) and nuts (36).
3. Lubricate and tighten the nuts (36) to the specified torque.
4. Install the cylindrical pin (10) in the pump shaft (51).
5. Install the coupling halves (10a).
6. Lubricate and cross-tighten the screws (9).
7. Install the coupling guards (7) and tighten the screws (7a).
Related information
7.1 Torques
7.2 Lubricants
3.2 Shaft seal, motor stool, pump head cover, sleeve
and chamber stack
3.2.1 Preparations
1. Remove the motor as described in the section on motor and
coupling removal.
2. Close the isolating valves, if fitted, to avoid draining the pipe
system.
3. Drain the pump by loosening the vent screw (18) and removing
the plugs (25) and O-rings (38).
Related information
3.1.1 Removal
3.2.2 Dismantling
1. Clean the end of the shaft (51) with a cloth.
2. If the shaft seal (105) is to be reused, remove any marks or
scratches on the shaft (51) by using service tool E together with
a piece of fine emery cloth.
3. Loosen the three set screws (113) of the shaft seal (105). Note
that the set screws must be loosened no more than 1/4 turn.
4. Loosen the shaft seal by using service tool A, together with
service tools O and P.
5. Carefully lift the shaft seal (105) off the shaft (51). Note that the
shaft seals fitted on pumps with ∅28 and ∅36 pump shafts can
be fitted with new wear parts. See the section on renewing shaft
seal wear parts.
6. Attach approved lifting equipment to the motor stool (1a) to
prevent it from falling before proceeding with any further
dismantling.
7. Remove nuts (36) and washers (66a).
8. Remove the motor stool (1a).
9. Remove the pump head cover (2). It may be necessary to
loosen it from the sleeve (55) using a plastic hammer.
10. Remove the O-ring (37) from the pump head cover.
11. Pull out the outlet part (44a) from the pump head cover (2).
12. CR pumps only: Remove the four screws (2d) and the brackets
(2c) from the pump head cover (2).
13. Fit service tool N on the pump sleeve (55). See the figure below.
TM071740
Service tool N fitted on sleeve (55)
14. Attach approved lifting equipment to service tool N and lift the
sleeve (55) up and away from the chamber stack.
6
English (GB)

15. Fit service tool B in the top of the pump shaft.
When handling the chamber stack, it is important to
pay close attention in order not to damage the thrust-
handling device (120), if fitted.
16. Attach approved lifting equipment to service tool B and lift up the
chamber stack.
TM071900
Lifting the chamber stack
17. Lay down the chamber stack in a fixed position so that it cannot
move.
18. Remove the O-ring (37) from the pump base.
Related information
6. Renewing shaft seal wear parts
7.3.1 Special tools
3.2.3 Assembly
1. Lubricate and install a new O-ring (37) in the pump base (6).
See the section on lubricants.
2. Carefully lift the chamber stack with approved lifting equipment
and lower it into the pump base.
Make sure to align the pump inlet part (44) with the tap in the
pump base (6). See the figure below.
TM071742
Aligning inlet part (44) in pump base (6)
3. Fit service tool N on the pump sleeve (55).
4. Attach approved lifting equipment to service tool N and lift the
sleeve (55) onto the pump base (6).
Make sure to align the sleeve (55) according to the alignment
marks on the sleeve (55) and on the pump base (6). Also
ensure that the sleeve (55) is pressed fully home in the pump
base (6).
TM070849
Aligning sleeve (55) in pump base (6)
5. Lubricate and install a new O-ring (37) in the pump head cover.
See the section on lubricants.
6. CR pumps only: Install the four screws (2d) and the brackets
(2c) in the pump head cover (2). See the section on torques.
7. Install the outlet part (44a) in the pump head cover (2).
7
English (GB)

8. Install the pump head cover (2) on the sleeve (55). Use service
tool J to centre the chamber stack in the pump head cover (2).
See the figure below.
TM071901
Fitting service tool Jin the pump head cover (2).
Make sure to align the pump head cover (2) according to the
alignment marks on the pump head cover (2) and on the sleeve
(55). See the figure below.
TM071741
Aligning pump head cover (2) and sleeve (55)
9. Attach approved lifting equipment to the motor stool (1a) and lift
the motor stool (1a) onto the pump head cover (2).
10. Install washers (66a) and nuts (36).
11. Lubricate the threads of the staybolts (26) and cross-tighten the
nuts (36) to the specified torque. See the sections on torques
and lubricants.
12. Remove service tool J.
13. Clean and smooth the shaft (51) using service tool E with an
emery cloth supplied with the shaft seal kit.
14. Lubricate the O-rings in the shaft seal (105). See the section on
lubricants.
Avoid lubrication on the seal faces.
15. Install the shaft seal (105) on the shaft (51) and press it home
against the pump head cover (2).
16. Tighten the shaft-seal hexagon nut to the specified torque by
using service tool A, together with service tools O and P. See
the section on torques.
8
English (GB)

17. Check that the height X is maximum 71 mm. See the figure
below.
If the measured height is not within the specifications, the pump
has not been assembled correctly, and the pump must be
dismantled to find the reason.
TM070969
X: 69 ± 2 mm
Note that the below text applies only for pumps with motor sizes
75 to 200 kW (100-300 hp) and fitted with a thrust-handling
device.
During assembly of the pump, there is a risk that the O-ring
(120i) causes the stationary ring (120g) to stick. As a result, the
entire chamber stack will not be fully seated inside the pump.
This can lead to malfunction and eventually damage to the
pump if it is started. See the figure below.
120g
120i
TM083369
Before making the shaft height adjustment, make sure the shaft
with impellers is placed as much downwards as possible inside
the pump. This can be checked by rotating the shaft by means
of a screwdriver inserted in the cross-hole at the top of the shaft.
TM083256
• If the friction is with high scattering or peaks caused by the
axial metal-to-metal contact between impeller and chamber,
then the shaft with impellers is positioned correctly and you
can go on with the shaft height adjustment using the
adjustment fork.
• If rotating freely with very little friction, try rotating CCW and
CW until the shaft binds and you feel the metallic contact
between the chambers and impellers.
• If you cannot feel the metallic contact between the chambers
and impellers, the pump must be disassembled, and the
stationary ring (120g) must be pressed fully down in the
pump base so that it is seated completely against the lifting
plate (120h) and the flange (120k).
18. Install the cylindrical pin (10) in the pump shaft (51).
19. Install the coupling halves (10a).
20. Lubricate and tighten the screws (9), but leave loose. See the
section on lubricants.
21. Check that the gaps on either side of the coupling halves are
equal. See the figure below.
TM071744
Gap between coupling halves
22. Tighten the three set screws (113) to the specified torque. See
the section on torques.
23. Lift the pump shaft with a crowbar and insert the adjusting fork
F. See the figure below.
TM070868
Lifting pump shaft and fitting adjusting fork.
24. Cross-tighten the screws (9) to the specified torque. See the
section on torques.
9
English (GB)

25. Pull the adjusting fork F free of the shaft (51) and place it on the
backside of one of the coupling guards (7). See the figure
below.
TM071743
Fitting adjusting fork Fon the backside of coupling guard (7)
26. Install the coupling guards (7) and tighten the screws (7a). See
the section on torques.
Related information
7.1 Torques
7.2 Lubricants
7.3.1 Special tools
3.3 Thrust-handling device
This section applies only for pumps fitted with a thrust-handling
device (120).
All parts for the thrust-handling device must be handled
very carefully in order to avoid damaging them.
There are two ways to service the thrust-handling device:
• by completely dismantling the entire pump.
See instructions in the section on servicing the thrust-handling
device by dismantling the entire pump.
• by positioning the pump horizontally and accessing the thrust-
handling device from the pump base.
See instructions in the section on servicing the thrust-handling
device from the pump base.
Related information
3.3.1 Servicing the thrust-handling device by dismantling the entire
pump
3.3.3 Servicing the thrust-handling device from the pump base
3.3.1 Servicing the thrust-handling device by dismantling the
entire pump
Preparations
Removing the thrust-handling device requires that the pump has
been dismantled as described in the sections on removal of the
motor and coupling and dismantling of the shaft seal, motor stool,
pump head cover, sleeve and chamber stack.
Dismantling
1. Lay down the chamber stack on a solid surface and take the
necessary precautions to prevent the chamber stack from
moving while working on it.
2. Loosen and remove the nut (120f) and washer (120e). Note that
the nut features a left-handed thread. Use service tools C, D, O
and P to hold the shaft when loosening the nut (120f).
D C O P
TM071746
Dismantling thrust-handling device from pump shaft
3. Remove thrust-handling-device wear parts (120a,120b, 120c,
120d). The parts come out together.
4. Remove the stationary ring (120g) together with the lifting plate
(120h) by using service tool G for pulling out the parts.
TM071745
Removing stationary ring (120g) and lifting plate (120h)
5. Remove the bolts (26b) from the pump base (6).
6. Remove the flange (120k) by using two bolts (26b) as
extractors.
26b
TM071747
Extracting the flange
10
English (GB)

7. To renew the thrust-handling-device wear parts, see the section
on renewing thrust-handling-device wear parts.
Related information
3.1.1 Removal
3.2.2 Dismantling
4. Renewing thrust-handling-device wear parts
3.3.2 Assembly
1. Install the flange (120k) in the pump base (6).
2. Fit and tighten the four screws (26b).
3. Fit the stationary ring (120g) together with the lifting plate (120h)
by using service tool G.
4. Fit thrust-handling device parts (120a,120b, 120c, 120d).
5. Fit the washer (120e) and nut (120f).
6. Tighten the nut (120f).
Note: Left-hand thread.
7. Follow the assembly instructions described in the section on
shaft seal, motor stool, pump head cover, sleeve and chamber
stack assembly.
Related information
3.2.3 Assembly
7.1 Torques
7.3.1 Special tools
3.3.3 Servicing the thrust-handling device from the pump base
Preparations
1. Disconnect the power supply and remove the power cable.
2. Close the isolating valves, if fitted, to avoid draining the pipe
system.
3. Drain the pump by opening the vent screw (18) and removing
the plugs (25) with O-rings (38).
4. Secure the pump with approved lifting equipment.
5. Loosen the pipe connections to the pump.
6. Loosen the base-plate bolts.
7. Place the pump horizontally with adequate work space around
the pump base (6). Follow the lifting instructions supplied with
the pump.
8. Make sure that the pump cannot move when working on it. See
the figure below.
TM071748
Inserting wedges for the pump not to move when working on it
Dismantling
1. Loosen and remove bolts (26b) from the pump base (6).
2. Remove the flange (120k) by using two bolts (26b) as
extractors. See the figure below.
26b
TM071749
Extracting the flange
3. Pull out thrust-handling-device wear parts (120g, 120h). You can
use service tool G for this.
4. Loosen and remove the nut (120f) and washer (120e). Note that
the nut features a left-handed thread. Use service tool D to hold
the pump shaft (51) when loosening. For information on holding
the pumps shaft (51) with service tool D, see the section on
assembly.
5. Pull out thrust-handling-device parts (120a, 120b, 120c, 120d).
The parts come out together.
6. To renew the thrust-handling-device wear parts, see the section
on renewing thrust-handling-device wear parts.
Related information
3.3.4 Assembly
4. Renewing thrust-handling-device wear parts
3.3.4 Assembly
1. Fit thrust-handling-device parts (120a, 120b, 120c, 120d).
2. Fit the washer (120e) and nut (120f).
3. Tighten the nut (120f). Use service tool D to hold the pump shaft
(51) when tightening. See the figure below.
Note that the nut features a left-handed thread.
TM071895
Holding the pumps shaft (51) with service tool D.
4. Lubricate the stationary ring (120g) on the sides only, and avoid
lubrication of the seal face.
5. Install the lifting plate (120h) in the stationary ring (120g).
6. Install the stationary ring (120g) with lifting plate (120h) in the
flange (120k).
7. Fit the stationary ring (120g) together with the lifting plate (120h)
in the flange (120k).
8. Install the flange (120k) in the pump base (6).
9. Fit and tighten the four bolts (26b).
Related information
7.1 Torques
11
English (GB)

4. Renewing thrust-handling-device wear parts
Preparations
Renewing the thrust-handling-device wear parts requires that the
thrust-handling device (120) has been removed as described in the
section on servicing the thrust-handling device by dismantling the
entire pump or in the section on servicing the thrust handling device
from the pump base.
Dismantling
1. Remove the rotating lock ring (120d) from the thrust disc (120a).
2. Remove the rotating ring (120b) from the thrust disc (120a).
3. Remove the O-ring (120c) from the thrust disc (120a).
4. Remove the O-ring (120i) and the three O-rings (120j) from the
flange (120k).
Assembly
1. Install the O-ring (120i) and the three O-rings (120j) on the
flange (120k).
2. Install the O-ring (120c) in the thrust disc (120a).
3. Install the rotating ring (120b) in the thrust disc (120a).
4. Install the rotating lock ring (120d) in the thrust disc (120a).
Related information
3.3.1 Servicing the thrust-handling device by dismantling the entire
pump
3.3.3 Servicing the thrust-handling device from the pump base
4.1 Chamber stack
The chamber stack can be serviced in two ways depending on
which service tool is used for the work:
• Service tool for vice mounting (H1), see the section on servicing
the chamber stack in service tool for vice mounting.
• Service tool for pump base mounting (H2), see the section on
servicing the chamber stack in service tool for pump base
mounting.
Related information
4.1.1 Servicing the chamber stack in service tool for vice mounting
4.1.2 Servicing the chamber stack in service tool for pump base
mounting
7.3.1 Special tools
4.1.1 Servicing the chamber stack in service tool for vice
mounting
Preparations
Removing the chamber stack requires that the pump has been
dismantled as described in the section on removal of the motor and
coupling, the section on shaft seal, motor stool, pump head cover,
sleeve and chamber stack and the section on thrust-handling
device.
• Assemble service tool H1. See the figure below.
TM071902
Service tool H1
Procedure
1. Place service tool H1 securely in a vice. See the figure below for
correct positioning.
2. Fit service tool B in the end of the pump shaft (51).
3. Attach approved lifting equipment to service tool B and lift the
chamber stack out of the pump base (6).
4. Lift the chamber stack onto service tool H1. See the figure
below. Make sure the pump-shaft end engages with the service
tool.
TM071750
Positioning the chamber stack in service tool H1
5. Align the hole in the pump shaft with the hole in service tool H1
marked "Dismantling". See the figure above.
6. Fit service tool D in the hole marked "Dismantling".
Dismantling
TM071751
Locking the shaft in service tool.
7. Continue to the section on dismantling the chamber stack.
12
English (GB)

Related information
3.1.1 Removal
3.3 Thrust-handling device
4.1.3 Dismantling the chamber stack
7.3.1 Special tools
4.1.2 Servicing the chamber stack in service tool for pump
base mounting
Preparations
Removing the chamber stack requires that the pump has been
dismantled as described in the section on removal of the motor and
coupling, the section on shaft seal, motor stool, pump head cover,
sleeve and chamber stack and the section on thrust-handling
device.
• Assemble service tool H2. See the figure below.
TM071903
Service tool H2
Procedure
1. Fit service tool B in the end of the pump shaft (51).
2. Attach approved lifting equipment to service tool B and lift the
chamber stack out of the pump base (6).
3. Lay down the chamber stack on a solid working surface and
take the necessary precautions to prevent the chamber stack
from moving around.
4. Install service tool H2 securely on the pump base (6). See the
figure below for correct positioning and installation.
TM071777
Service tool H2for mounting on pump base
5. Lift the chamber stack onto service tool H2. See the figure
below. Make sure the pump-shaft end engages with the service
tool.
TM071752
Positioning the chamber stack in service tool H2
6. Align the hole in the pump shaft with the hole in service tool H2
marked "Dismantling". See the figure below.
13
English (GB)

7. Fit service tool D in the hole marked "Dismantling". See the
figure below.
Dismantling
TM071778
Locking the shaft in service tool H2
8. Continue to the section on dismantling the chamber stack.
Related information
3.1.1 Removal
3.3 Thrust-handling device
4.1.3 Dismantling the chamber stack
7.3.1 Special tools
4.1.3 Dismantling the chamber stack
Preparations
Removing the chamber stack requires that the pump has been
dismantled as described in the section on removal of the motor and
coupling and the section on shaft seal, motor stool, pump head
cover, sleeve and chamber stack
Dismantling the chamber stack also requires that it is mounted in
service tool H1 or H2 as described in the sections on servicing the
chamber stack in service tool for vice mounting or servicing the
chamber stack in service tool for pump base mounting.
Procedure
1. Loosen the screws (26 b) and remove the straps (26a).
2. Remove the top chamber (3 or 3a).
3. Loosen the split-cone nut (48) using service tool C, but leave it
so that it is still engaged with a few turns of thread on the
impeller (49 or 49a).
4. Install service tool I on top of the pump shaft (51) to protect the
shaft recess. Note that this applies only if the top of the pump
shaft has a reduced diameter compared to the rest of the shaft.
5. For pumps with ∅22 pump shaft: Turn service tool C around
and knock it against the split-cone nut (48) to loosen the
impeller (49 or 49a) from the split-cone (49b). See the figure
below.
TM071779
Loosening the impeller (49 or 49a) with service tool C
6. For pumps with ∅28 or ∅36 pump shaft: Insert service tool
M on top of the split-cone nut (48) and use a hammer to knock
service tool Q against the split-cone nut (48) to loosen the
impeller (49 or 49a) from the split cone (49b). See the figure
below.
TM071780
Loosening the impeller (49 or 49a) with service tool Q
7. Remove the split-cone nut (48), split cone (49b) and impeller (49
or 49a).
14
English (GB)

8. Continue removing the remaining chambers (4 or 4a), split-cone
nuts (48), split cones (49b), impellers (49 or 49a) and bearings
(47a).
For pumps with ∅28 or ∅36 pump shaft:
Note that for pumps with ∅28 or ∅36 pump shaft, you must also
remove the lock ring (47g). See the figure below.
Do not open the lock ring (47g) further than the
restriction of the integrated locking mechanism. See
the figure below.
Max
TM072074
Maximum permissible opening of lock ring (47g)
9. Remove the inlet part (44).
10. To renew the chamber wear parts, see the section on renewing
chamber wear parts.
Related information
3.1.1 Removal
4.1.1 Servicing the chamber stack in service tool for vice mounting
4.1.2 Servicing the chamber stack in service tool for pump base
mounting
5.1 Neck ring (45)
7.3.1 Special tools
4.1.4 Assembling the chamber stack
For chamber types, see the section on order of assembly for
chambers and impellers.
1. Install the inlet part (44) over the pump shaft (51) which is
placed in service tool H1 or H2.
2. Fit the impeller (49 or 49a) which was removed as the last one
during dismantling.
3. Fit a split-cone (49b) in the impeller (49 or 49a).
4. Turn service tool C around and knock it against the split-cone
(49b) to fixate the impeller (49 or 49a) to the pump shaft (51).
See the figure below.
TM071896
Fixating the impeller (49 or 49a) to the pump shaft (51) with
service tool C
5. Fit a split-cone nut (48) to the impeller.
6. Hold the impeller (49 or 49a) with a hook spanner. Tighten the
split-cone nut (48) using the service tools C, O and P.
7. Lubricate and fit the bearing (47a).
8. For pumps with ∅28 or ∅36 pump shaft: Note that for pumps
with ∅28 or ∅36 pump shaft, you must also fit the lock ring
(47g). See the figure below. Make sure that the lock ring (47g)
tightens firmly around the pump shaft and holds the bearing
(47a) fixed on the pump shaft.
Do not open the lock ring (47g) further than the
restriction of the integrated locking mechanism. See
the figure below.
Max
TM072073
Maximum permissible opening of lock ring (47g)
15
English (GB)

9. Fit the bottom chamber with bearing (4a), and press it home on
the inlet part (44).
10. Continue installing the remaining chambers (4), split-cone nuts
(48), split cones (49b), impellers (49 or 49a) and bearings (47a).
11. Fit the outlet part (44a) on the top chamber.
12. Fit the strap (26a), washers (26c) and screws (26b). Lubricate
and tighten the screws.
13. Carefully lift the chamber stack with approved lifting equipment.
14. Follow the assembly instructions described in the section on
shaft seal, motor stool, pump head cover, sleeve and chamber
stack assembly.
Related information
3.2.3 Assembly
7.1 Torques
7.2 Lubricants
7.3.1 Special tools
7.4 Order of assembly for chambers and impellers
5. Renewing chamber wear parts
5.1 Neck ring (45)
Neck rings (45) and neck-ring retainers (65) are installed in
chambers (4 or 4a) and in the inlet part (44). See the sections on
dismantling and assembly for the renewal of neck rings in chambers
as well as in the inlet part.
5.1.1 Dismantling
1. Free the neck-ring retainer (65) from the chamber (4 or 4a) or
inlet part (44) by using a flat-blade screwdriver.
2. Remove the neck ring (45).
5.1.2 Assembly
1. Use service tool L and select the disc size for the pump which is
being serviced and remove the remaining discs from the service
tool. See the figure below.
Make sure that service tool L and the neck rings are
completely clean during assembly. If particles are
present between the tool and the pump parts, it may
result in the neck rings being installed wrongly.
CR,CRN 255
CR,CRN 215
CR,CRN 185
CR,CRN 155
CR,CRN 125
CR,CRN 95
4
3
1
2
TM071781
Service tool Lfor installing the neck ring
Pos. Description
1 Distance piece
2 Screw
3 Top cover
4 Base
2. Place service tool L in a vice. See the figure below.
TM071782
Service tool Lplaced in a vice
16
English (GB)

3. Place the neck-ring retainer (65) on top of the disc with the
driving dogs upwards. See the figure below.
TM071783
Neck-ring retainer (65) placed in service tool with the driving dogs
pointing upwards
4. Place the neck ring (45) on top of the neck-ring retainer (65).
Note that the text "UP" which is stamped into the neck ring (45)
must point down towards the neck ring (65). See the figure
below.
TM071784
Placing neck ring (45) with the text "UP" pointing down towards
the neck-ring retainer (65)
5. Place the chamber (4 or 4a) or inlet part (44) over the neck ring
(45) and neck-ring retainer (65). See fig. 'Neck ring, neck-ring
retainer and chamber positioned in service tool L' and 'Neck
ring, neck-ring retainer and inlet part positioned in service
tool L'.
6. Place the top plate of service tool L on top of the chamber or
inlet part and align it so it fits. See fig. 'Neck ring, neck-ring
retainer and chamber positioned in service tool L' and 'Neck
ring, neck-ring retainer and inlet part positioned in service
tool L'.
7. Fit the distance piece and screw on the top plate of service tool
L. See fig. 'Neck ring, neck-ring retainer and chamber positioned
in service tool L' and 'Neck ring, neck-ring retainer and inlet part
positioned in service tool L'.
8. Tighten the screw to 20 Nm.
TM071785
Neck ring, neck-ring retainer and chamber positioned in service
tool L
TM071897
Neck ring, neck-ring retainer and inlet part positioned in service
tool L
17
English (GB)

5.2 Bush (47c) and retaining ring (47d)
5.2.1 Dismantling
1. Place the chamber on a flat surface.
2. Press the bush (47c) and retaining ring (47d) out of the chamber
using service tool K.
TM071786
Pressing out the bush (47c) and retaining ring (47d) with service
tool K
5.2.2 Assembly
1. Place the chamber on a level and solid surface with the neck
ring (45) facing downwards.
2. Place the bush (47c) and retaining ring (47c) on service tool K.
3. With a pressing tool, press the retaining ring (47d) and bush
(47c) home in the chamber by using service tool K.
TM071787
Installing the bush (47c) and retaining ring (47d) with service tool
K
6. Renewing shaft seal wear parts
This section applies only to shaft seals with an inner diameter of
∅28 or ∅36.
Shaft seals with an inner diameter of ∅22 cannot be serviced but
must be replaced instead.
115
113
108
109
114
102
103
104
107
112a
110
105
116
TM071904
Shaft seal parts for ∅ 28 and ∅ 36 shaft seals
6.1 Dismantling
1. Place the shaft seal (105) on a work table.
2. Press down the shaft seal and compress the spring (108) with
one hand while removing the three set screws (113).
3. Remove the lock ring (116).
4. Remove the stationary seal-ring retainer (114) together with the
rotating seal ring (104).
5. Remove the O-ring (109) from the stationary seal-ring retainer
(114).
6. Remove the stationary seal ring (103) from the stationary seal-
ring retainer (114) by using a small flat-bladed screwdriver.
7. Remove the O-ring (102) from the stationary seal-ring retainer
(114).
8. Remove the upper seal driver (112a).
9. Remove the O-ring (107) from the upper seal driver (112a).
10. Remove the spring (108).
11. Remove the O-ring (110) from the shaft seal cartridge (115).
18
English (GB)

6.2 Assembly
Do not touch the seal faces of the stationary seal ring
(103) or rotating seal ring (104). Only hold these parts on
their sides.
Do not apply any kind of grease or lubricant on the
stationary seal ring (103) or rotating seal ring (104) since
this can result in malfunction of the shaft seal.
Handle all shaft seal parts very carefully and avoid
scratching or denting them.
1. Clean and de-grease all parts.
2. Lubricate the new O-ring (110) and install it in the shaft seal
cartridge (115).
3. Install the spring (108) on the shaft seal cartridge (115).
4. Install the upper seal driver (112a) on the shaft seal cartridge
(115).
5. Install a new O-ring (107) on the shaft seal cartridge (115).
6. Install a new rotating seal ring (104) on the shaft seal cartridge
(115).
7. Lubricate the new O-ring (109) and install it on the stationary
seal-ring retainer (114).
8. Install a new O-ring (102) in the stationary seal-ring retainer
(114).
9. Install a new stationary seal ring (103) in the stationary seal-ring
retainer (114).
10. Install the stationary seal-ring retainer (114) on the shaft seal
cartridge (115).
11. Fit the three set screws (113) in the lock ring (116).
12. Install the lock ring (116) on the shaft seal cartridge (115).
13. Press down on top of the lock ring (116) while aligning the three
set screws (113) with the holes in the shaft seal cartridge (115).
14. Screw in the three set screws (113) only so much that they
engage with the holes in the shaft seal cartridge (115) and keep
the shaft seal parts together.
Note that the screws (113) must not protrude on the inside of the
shaft seal cartridge (115) since this will make it difficult to re-
install the shaft seal (105) on the pump shaft (51).
19
English (GB)

7. Additional information
7.1 Torques
Pos. Description Dimensions Torque [Nm]
2d Screws for bracket M6 6.5
7a Coupling-guard screws M5 4
9 Coupling screws M10 85
M16 100
18 Vent screw 1/2" 35
19 Plug 1/2" 35
25 Plug 1/2" 35
26b Hexagon-socket head-cap screw M8 15
36 Staybolt nuts
M16 (CR, CRN 95, PN 16/25/30) 160
M20 (CR, CRN 95, PN 25) 220
M20 (CR, CRN 95, PN 30/40) 320
M20 (CR, CRN 95/125/155, PN 16) 190
M20 (CR, CRN 125/155, PN 25/30) 320
M24 (CR, CRN 125/155, PN 16) 190
M24 (CR, CRN 125/155, PN 25/30/40) 625
M30 (CR, CRN 185/215/255, PN 16) 410
M30 (CR, CRN 185/215/255, PN 25) 710
M30 (CR, CRN 185/215/255, PN 40) 950
36 Motor-stool nuts
M12 40
M16 80
M20 150
48 Split-cone nut
∅22 shaft (Hex 34) 70
∅28 shaft (Hex 46) 130
∅36 shaft (Hex 60) 290
105 Shaft seal Hex 60 100
Hex 75 150
113 Shaft-seal-set screws M6 x 8 6
120f Nut with left-hand thread M12 60
M16 140
L Tool for installing neck ring - 15
7.2 Lubricants
Pos. Description Lubricant Product no.
9 Hexagon-socket screw
Un Lock 96611372
26 Staybolt
36 Nut
36
37 O-ring
Rocol Sapphire Aqua-Sil 00RM2924
47a Bearing
109 O-ring for shaft seal (105)
110 O-ring for shaft seal (105)
120c O-ring
120g Stationary ring
120j O-ring
20
English (GB)