Grundfos MS6000P Operating instructions

MS6000P
Submersible motors
Service instructions
GRUNDFOS INSTRUCTIONS

MS6000P
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 Position numbers...........................4
1.4 Before dismantling ..........................4
1.5 Before assembly ...........................5
1.6 During assembly ...........................5
2. Identification .............................5
2.1 Nameplate ...............................5
2.2 Product number key .........................5
2.3 Type key ................................6
3. Tightening torques and lubricants ...............7
4. Service tools .............................8
4.1 Standard tools ............................9
4.2 Special tools .............................9
4.3 Torque tools ..............................9
4.4 Measuring tools...........................10
5. Motor check/fault finding ....................10
6. Dismantling MS6000P ......................11
6.1 Component check .........................12
6.2 Replacement of the wear parts .................12
7. Assembling MS6000P ......................13
8. Dismantling MS6000P (flange extension) .........15
8.1 Component check .........................16
8.2 Replacement of the wear parts .................16
9. Assembling MS6000P (flange extension) .........17
10. Filling procedure with a syringe ...............19
11. Final check .............................19
12. Maintenance and service ....................20
12.1 Fault finding the product .....................20
13. Checking the motor and cable ................21
13.1 Winding resistance MS6000P ..................22
13.2 Insulation resistance........................22
14. Motor connection.........................22
14.1 MS6000P motors with single-cable connection........22
14.2 MS6000P motors with double-cable connection .......22
15. Parts list...............................23
16. Exploded drawing of MS6000/MS6000P ..........24
17. Exploded drawing of MS6000/MS6000P (flange
extension) .............................25
1. General information
Read this document before you start service work on the
product. Service work must comply with local regulations
and accepted codes of good practice.
Observe the safety instructions in the installation and
operating instructions for the product.
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.
1.3 Position numbers
Position numbers of motor parts (digits) refer to section 16.
Exploded drawing of MS6000/MS6000P and section 17. Exploded
drawing MS6000/MS6000P (flange extension). Position numbers of
service tools (letters) refer to section 4. Service tools.
Related information
4. Service tools
16. Exploded drawing of MS6000/MS6000P
17. Exploded drawing of MS6000/MS6000P (flange extension)
1.4 Before dismantling
• Switch off the power supply to the motor.
• Disconnect the power supply cable in accordance with local
regulations.
4
English (GB)

1.5 Before assembly
• Clean and check all parts.
• Replace defective parts.
• Order the necessary service kits.
• Always replace O-rings when the motor is serviced.
1.6 During assembly
• Lubricate O-rings and tighten screws to the correct torque. See
section Tightening torques and lubricants.
2. Identification
2.1 Nameplate
DK-8850 Bjerringbro, Denmark
43 2 1
22
21
20
23
24
2526
27
28
29
10
9
8
7
5
11
12
13
6
16
15
14
17
18
19
Pos. Description
1Product number
- 76XXXXXX: product without packaging
2 Output power in [kW and hp]
3 Frequency
4 Type designation
Pos. Description
5 Supply voltage
6 Phases
7 Connection
8 Minimum operating frequency
9 Maximum operating pressure
10 Maximum liquid temperature at minimum flow past the
motor
11 Motor designed for continuous operation (S1)
12 CE mark and approvals
13 PM back EMF at 100 Hz
14 PM back EMF at 120 Hz
15 Inverter type
16 Enclosure class
17 Country of production
18 Insulation class
19 Net weight in [kg and lb]
20 Load type
21 Inverter duty
22 Rated speed min-1
23 Production code
24 Power factor cos φ at SF load
25 Serial number
26 Service factor current
27 Full load current
28 Model (A = first generation)
29 Service factor
2.2 Product number key
Example 76 20 46 17
Motor code Voltage code Configuration code Power code
Motor code
76 MS6000P
Voltage code Voltage range
100 Hz 120 Hz
20 3 x 350 V 3 x 410 V
37 3 x 350 V 3 x 410 V
Configuration code Sleeve material Tempcon Rubber material Shaft seal Radial bearing Motor liquid Temperature Flange extension
46 EN 1.4539 Without FKM BQQV Soft SML3 T60 Without
62 EN 1.4301 Without NBR BQQP Soft SML3 T60 With
77 EN 1.4301 Without NBR BQQP Soft SML3 T60 Without
Power code
12 7.5 kW 10 hp
17 18.5 kW 25 hp
20 30 kW 40 hp
22 45 kW 60 hp
5
English (GB)

2.3 Type key
Example MS6000P R E S X T60 3 x 350/100 410/120 18.5 kW
Pos. 1 2 3 4 5 6 7 8 9 10 11
Pos. Description
1 Motor type
P = MS6000P synchronous motor
2 Material type
-
R
=
=
EN 1.4301
EN 1.4539
3 Rubber
-
E
=
=
NBR
FKM
4 Shaft seal
-
S
Q
=
=
=
Ceramic/carbon
SiC/SiC
SiC/SiC
BXPFF/NBR
Q1Q1VFF/FKM
Q1Q1PFF/NBR
5 Radial bearings
-
W
=
=
Carbon graphite/stainless steel
SIC/Tungsten carbide
6 Motor liquid
-
D
H
=
=
=
SML-3
Demineralised water
Glycol 60 vol % HTF
7 Flange extension
-
F
=
=
Without
With
8 Tempcon
X = Without
9 Max. liquid temperature
T60 = 60 °C
10 Voltage
3 x 350/100 410/120 = 3 x 350 V/100 Hz - 3 x 410 V/120 Hz
11 Motor power
4 kW
5.5 kW
7.5 kW
9.2 kW
11 kW
13 kW
15 kW
18.5 kW
22 kW
26 kW
30 kW
37 kW
45 kW
5.5 hp
7.5 hp
10 hp
12 hp
15 hp
18 hp
20 hp
25 hp
30 hp
35 hp
40 hp
50 hp
60 hp
The type key cannot be used for ordering as not all combinations are available.
6
English (GB)

3. Tightening torques and lubricants
Pos. Designation Quantity Dimensions
[mm]
Torque
[Nm] Lubricant
22 Hexagon head screw 4 (8*) 1/2"-20 UNF-2A x 32 50 ± 7 Nm -
22a Screw with nylon washer 1 M5 x 20 3.5 ± 0.5 Nm -
24 O-ring 1 ∅65 x 2.5 - Shell Cassida
32 Shaft seal housing 1 - - Shell Cassida
32a Seal ring 1 - - Shell Cassida
33 Shaft seal, stationary part 1 - - Shell Cassida
34 Shaft seal, rotating part 1 - - Motor liquid
41 Hexagon socket head cap screw 4 M10 x 20 46 ± 5 Nm -
45a Hexagon socket head cap screw 1 M5 x 25 4.5 ± 0.5 Nm -
46 Screw with Nyltite 4 M5 x 25 4.5 ± 0.5 Nm -
48 Screw 4 M5 x 20 4.5 ± 0.5 Nm -
50 Screw 4 M6 x 15/M6 x 16** 4.5 ± 0.5 Nm -
220a Screw 2 M6 x 15/M6 x 16** 4.5 ± 0.5 Nm -
* Motor with flange extension
** Motor in R-version
Related information
7. Assembling MS6000P
9. Assembling MS6000P (flange extension)
7
English (GB)

4. Service tools
A B C D E
G H I J K L
M N O P Q R
S T U V W Y
Z AA AB AC AN
AD
AE AF AG AH AI AJ AK AL
Related information
1.3 Position numbers
8
English (GB)

4.1 Standard tools
Tool Description Pos. Part number
A Screwdrivers, cross and slot 32, 49 -
B Torx 20 screwdriver 22a, 50, 221 -
C Torx 25 screwdriver 45a, 46, 48 -
D Open-end spanner 17 mm 22 -
E Open-end spanner 19 mm 22 -
G Hexagon tee key 8 mm 41 -
H Hexagon head driver 8 mm 41 -
I Plastic mallet - -
J Slide gauge - -
K Depth gauge - -
4.2 Special tools
Tool Description Pos. Part number
L Jaws 2 00SV7900
M Torx 50 head driver (machined) 22 96164206
N Ring spanner (machined) 22 96164186
O Puller for rotating thrust bearing 7.5 and 27 kN 6 00SV0335
P Plug for puller I, 6 00SV7923
Q Puller for rotating thrust bearing 40 kN 6 00SV7920
R Punch for rotating thrust bearing 7.5 kN 6 96164233
S Punch for rotating thrust bearing 27 and 40 kN 6 96164234
T Bracket 1 96164181
U Spanner for shaft height adjustment 45b 00SV7921
V Punch for shaft seal 33, 34 V7216306
W Filling syringe 1 00SV8000
X Vacuum filling device 1 00SV0088
Y Spline head driver (torque measurement) 2, U 96164190
Z Shaft height gauge 2 00SV0115
AD Shaft with rotor alignment tool, consisting of tools AE to AL 2, 5 99917700
AE Centering flange - -
AF Centering flange - -
AG Shaft extension - -
AH Shaft extension - -
AI Alignment disc - -
AJ Positioning screw, 4 pcs. - -
AK Shaft conical bearing - -
AL Assembly tool - -
AN Cable plug protection cap - 780418
4.3 Torque tools
Tool Description Pos. Part number
AA Torque wrench 40-200 Nm 22, 41 -
AB Torque screwdriver 1-6 Nm 22a, 50, 221, 45a, 46, 48 -
AC Ratchet insert tool -
9
English (GB)

4.4 Measuring tools
Description Part number
Multimeter -
Megger -
5. Motor check/fault finding
Used motors must be checked and dismantled. Inspect
and document the observations of each component during
dismantling. Check the following:
• Check the motor for damage and fractures.
• Check that the motor is filled with liquid and has no leaks at the
diaphragm or shaft seal. Place the motor with the filling screw
(22a) upwards and remove the screw; turn the shaft end and
check the motor liquid level. The motor liquid level must be
visible.
• Check that the height from the shaft end to the contact face of
thread holes is 72.8 ± 0.2 mm.
• Check that the axial clearance is minimum 1 mm.
• Check that the motor shaft spins freely.
• Check that the plug pins for the cable connection are not
defective or burnt.
• Check that the winding resistance is as stated in electrical data.
See sections 13. Checking the motor and cable and 13.1
Winding resistance MS6000P.
• Check that the motor insulation resistance complies with local
regulations. See section 13.2 Insulation resistance.
• Check the motor cable and the submersible drop cable for visual
damage.
• Submerge the motor cable and the submersible drop cable in
water and check that there is no leakage in the cables
measuring their insulation resistance with a megger.
• Measure the electrical resistance of the motor with the cable
mounted on.
• Measure the insulation resistance of the motor with the cable
mounted on using a megger.
• Measure the electrical resistance of the motor without cable,
directly on the terminals.
• Measure the insulation resistance of the motor without the
cable, directly on the terminals using a megger.
Related information
13. Checking the motor and cable
13.1 Winding resistance MS6000P
13.2 Insulation resistance
10
English (GB)

6. Dismantling MS6000P
DANGER
Magnetic field
Death or serious personal injury
‐The rotor dismantled from the motor must never be
handled by a person with a pacemaker.
WARNING
Crushing of fingers
Death or serious personal injury
‐Keep the surroundings of the dismantled rotor free of
magnetic objects, and be careful when placing the
rotor on a magnetic surface.
DANGER
Electric shock
Death or serious personal injury
‐Before starting any work on the product, make sure
that motor cable ends are not live.
‐Make sure that the power supply cannot be
accidentally switched on.
For further information, see the MS6000P service video.
1. Place the motor vertically in a set of jaws (L).
Note: Make sure that the motor is secure in the jaws and it
cannot move.
2. Before dismantling the motor, disconnect the motor cable by
slacking and removing the two screws (220a) and the screw
(50) holding the earth clamp.
3. Use two screwdrivers to manoeuvre the plug (220) out of its
socket, then pull out the plug.
4. Insert cable plug protection cap (AN).
5. Remove the sand shield (27) from the shaft.
6. Slacken and remove the remaining three screws (50) holding
the shaft seal housing (32).
7. Use two screwdrivers to tip out the shaft seal housing (32). See
the figure below.
8. Remove the rotating part of the shaft seal (34).
9. Remove the washer (28) from the shaft.
10. Tilt the motor and drain the motor liquid into a bucket.
11. Turn the motor to vertical position with the NDE facing upwards
and loosen the four screws (46) holding the bottom cover (13).
12. Remove the bottom cover including the diaphragm (12).
13. Turn the motor to horizontal position.
14. Slacken and remove the four screws (48) together with the
clamping flange (7).
15. Press down the shaft adjusting unit (45) against the thrust
bearing to relieve the stress on the retainer spring (49).
16. Use a small screwdriver to push the retainer spring out of the
recess in the stator housing (1) and pull out the shaft adjusting
unit.
17. Slacken and remove the screws (41).
18. Remove the stationary part of the thrust bearing (3) by tilting it
out of its brackets (42).
Note: To remove the 40 kN thrust bearing, it may be necessary
to use two screwdrivers to force the stationary part of the thrust
bearing out of its brackets.
19. Pull off the rotating part of the thrust bearing (6). The approach
depends on the size of the thrust bearing.
7.5 kN or 27 kN thrust bearing
a. Pull off the rotating part of the thrust bearing (6) by using a
puller (O) together with a plug (P).
b. Remove the plug (P).
40 kN thrust bearing
a. Mount the puller (Q) into the rotating part of the thrust bearing
(6) and fasten it with its two screws.
b. Use a hexagon tee key (G) to fasten the two screws in the
puller until the rotating part of the thrust bearing loses the grip
from the conus on the shaft.
c. Remove the puller and the rotating part of the thrust bearing.
20. Remove the stop for bearing bracket(s) (42).
21. Remove the clamping flange (7a) and the NDE radial bearing
(4) from the stator housing.
22. Push the rotor slightly towards the DE in order to loosen the DE
bearing retainer. Pull out the DE radial bearing (5) with a small
screwdriver.
23. Mount centering tool AE and shaft extension tool AH in the
motor DE. Mount centering tool AF and shaft extension tool AG
on the motor NDE. Use the screws of the motor. See the figure
below.
24. Carefully push out the rotor (2) from the stator housing, and
place it in a clean place without any loose metal parts or burrs.
Note: It is a permanent magnet rotor!.
25. Remove centering tools AE and AF.
26. Remove the upthrust ring (2a) positioned in the DE of the stator
housing (1). Use a long wooden stick to push out the upthrust
ring.
Note: The upthrust ring can only be removed by pushing it out
from the DE towards the NDE.
11
English (GB)

6.1 Component check
Before assembling the motor, clean and check all parts for damage
and wear. All rubber parts must be soft, flexible and intact.
The following components should be checked:
Shaft seal
The sliding surface must be intact and smooth.
NDE and DE radial bearing
The bearings must be intact, smooth and without visible wear.
Shaft with rotor
The radial bearing surfaces (sliding surfaces) on the shaft must be
intact, smooth and without visible wear.
Thrust bearing
The thrust bearing must be intact and the sliding surfaces must be
intact and smooth.
Upthrust ring
The ring must be intact and smooth.
Motor liquid
The motor liquid must be clean and clear when the shaft seal
housing is removed.
Black motor liquid may indicate damaged bearing components.
Diaphragm
The diaphragm must be soft, flexible and intact without cracks.
6.2 Replacement of the wear parts
Always replace defective parts with wear part kits. See the
recommended kits and spare parts in the MS Service Kit Catalogue.
Related information
• MS Service Kit Catalogue
12
English (GB)

7. Assembling MS6000P
Assemble the motor after the parts are cleaned and checked, and
the defective parts are replaced with new ones.
DANGER
Magnetic field
Death or serious personal injury
‐The rotor dismantled from the motor must never be
handled by a person with a pacemaker.
WARNING
Crushing of fingers
Death or serious personal injury
‐Keep the surroundings of the dismantled rotor free of
magnetic objects, and be careful when placing the
rotor on a magnetic surface.
For further information, see MS6000P service video.
1. Place the stator housing (1) vertically in the jaws (L) with DE
upwards and tighten.
2. Mount centering tool AE in the stator housing.
3. Rotate the stator housing (1) 180° and tighten the jaws (L).
4. Insert the upthrust ring (2a) into the stator housing (1) and push
it into place with shaft extension tool AG.
5. Mount centering tool AF in the stator housing.
6. Turn the stator housing to horizontal position.
7. Fit the shaft extension tools AG and AH to the rotor and
carefully insert the rotor into the stator housing from the NDE.
Note:Pay attention to the magnetic forces when inserting the
shaft with the rotor into the stator housing.
8. Remove the shaft extension tools AG and AH and the centering
tools AE and AF.
9. Fit the aligning bracket (T) over the motor head using two of the
threaded holes and the belonging screws (22). Push the rotor
towards the DE so it touches the bracket.
10. Turn the stator housing to vertical position with the NDE facing
up.
11. Insert the NDE radial bearing (4) into the stator housing and
push it in place with the shaft extension tool AG, if necessary.
12. Insert alignment disc (AI) and fasten it with the 4 positioning
screws (AJ).
13. Use the shaft conical bearing (AK) to align the
radial bearing NDE (4).
14. Remove the alignment disc (AI) and the 4 positioning screws
(AJ).
15. Insert the clamping flange (7a). Make sure that the holes of the
clamping flange are aligned with the threaded holes in the stator
housing (1).
16. Insert the rotation stop for bearing bracket(s) (42).
17. Fasten the bracket(s) and clamping flange with the four screws
(41). Use the torque wrench (AA) and the wrench (AC). See
section 3. Tightening torques and lubricants. Depending on the
size of the thrust bearing, there are different types and numbers
of brackets.
Bracket for 7.5 kN thrust bearing
Brackets for 27 kN thrust bearing
Brackets for 40 kN thrust bearing
18. Fit the rotating part of the thrust bearing (6) onto the shaft.
19. Use a plastic mallet (I) and a punch (R or S), according to the
size of the thrust bearing to fix the rotating part on the conus of
the shaft.
Note: The rotating part must be put into the correct position with
one hit, otherwise, the shaft height may change over time
resulting in damage to the thrust bearing.
20. Fit the stationary part of the thrust bearing (3) into the stop for
bearing bracket(s) (42).
Note: As the 40 kN may be difficult to fit, use two screwdrivers
to push the bracket to the sides and manoeuvre the thrust
bearing into the correct position.
21. Fit the shaft adjustment unit (45) into the stator housing.
13
English (GB)

22. Secure the shaft adjustment unit with a retainer spring (49).
Note: Before fitting the retainer spring, clean the recess to
ensure the retainer spring is in contact with the bottom of the
recess.
23. Insert the clamping flange (7) into the stator housing.
Note: Align the innermost holes with the holes in the shaft
adjustment unit (45).
24. Fasten the clamping flange with four screws (48) and cross-
tighten with the specified torque, using a torque screwdriver
(AB). See section 3. Tightening torques and lubricants.
25. Loosen the lock screw (45a) and the shaft adjustment screw
(45b) to have adjustment space (too low shaft height).
26. Turn the stator housing 180° in the jaws, so the DE is facing
upwards.
27. Remove the bracket (T).
28. Carefully insert the radial bearing (5) into the stator housing.
Note: Position the radial bearing so it is not resting on the taps
of the upthrust ring when the shaft seal housing is mounted. If
the radial bearing is in the correct position, it drops down when
turned with a screwdriver.
29. Make sure that the radial bearing is centered in the stator
housing. Position assembly tool AL over the shaft and on the
top of the stator housing. Use a plastic mallet (I) and a punch
(V) to drive the assembly tool AL against the mounting face for
the shaft seal housing.
30. Remove assembly tool AL from the shaft.
31. Check the shaft height using a depth gauge (K), or a shaft
height gauge (Z). The shaft height must be within 72.8 ± 0.2
mm. See the figure below.
Note: Make sure that the depth gauge is square between the
shaft end and the motor flange.
72.8±0.2
72.8±0.2
32. To adjust the shaft height, attend to the NDE of the motor and
adjust the height by turning the screw (45b) with the shaft height
adjustment spanner (U).
1
2
2
45a
45b
33. When the shaft is adjusted to the correct height, tighten the lock
screw (45a) with the specified torque using a torque screwdriver
(AB). See section 3. Tightening torques and lubricants.
34. Turn the stator housing to horizontal position.
35. Fit the diaphragm (12) and the end cover (13). Fasten them with
the four screws (46).
Note: Nylon washers must be renewed on all screws.
36. Cross-tighten the screws with the specified torque, using a
torque screwdriver (AB). See section 3. Tightening torques and
lubricants.
37. Turn the stator housing to vertical position, with the DE facing
upwards.
38. Use the spline head driver (Y) to check that the shaft rotates
freely.
39. Fill motor liquid (SML-3) into the stator housing until it is full.
40. Move the shaft up and down and rotate the shaft to let air
escape.
41. Refill the stator housing with motor liquid, if necessary.
42. Slide the washer (28) down on the shaft, so it is positioned in
the recess of the radial bearing.
43. Lubricate the rotating part of the shaft seal (34) and the shaft
with motor liquid.
44. Fit the rotating part of the shaft seal onto the shaft and press it
down using the punch (V).
45. Lubricate the recess inside the shaft seal housing (32) and the
outer surface of the stationary part of the shaft seal (33). See
section 3. Tightening torques and lubricants.
46. Press the stationary part of the shaft seal (33) into the recess of
the shaft seal housing, using the punch (V).
Note: On the MS6000 R version, press a lip seal (32a) into the
shaft seal housing before inserting the stationary part of the
shaft seal.
47. Fit the shaft seal housing with an O-ring (24) and lubricate
it. See section 3. Tightening torques and lubricants
48. Fit the shaft seal housing (32) into the top of the motor and
press it down into place by using the punch for shaft seal (V).
49. Fit the four screws (50) into the shaft seal housing and cross-
tighten them in two steps. First, cross-tighten with a screwdriver
and then with the specified torque, using a torque screwdriver
(AB). See section 3. Tightening torques and lubricants.
50. Top up the motor liquid, see section 10. Filling procedure with a
syringe.
51. Fit the sand shield (27) on the shaft and push it down to the
shaft seal housing (32). Make sure that the steel ring inside the
sand fighter is facing the shaft seal housing.
52. Remove the cable plug protection cap (AN).
53. Remove one screw (50) to fit the motor cable earth connection.
54. Insert the motor cable plug (220) into the cable socket.
Note: For proper sealing, always use a new motor cable.
55. Tighten the motor cable plug with the screws (220a) and the last
screw (50) on the shaft seal housing.
56. Tighten the screws for the motor cable (220a) with the specified
torque, using a torque screwdriver (AB). See section 3.
Tightening torques and lubricants.
57. Cross-tighten the screws in the shaft seal housing (50) with the
specified torque, using a torque screwdriver (AB). See section 3.
Tightening torques and lubricants.
58. Perform a final check, see section 11. Final check.
Related information
3. Tightening torques and lubricants
10. Filling procedure with a syringe
11. Final check
14
English (GB)

8. Dismantling MS6000P (flange extension)
DANGER
Magnetic field
Death or serious personal injury
‐The rotor dismantled from the motor must never be
handled by a person with a pacemaker.
WARNING
Crushing of fingers
Death or serious personal injury
‐Keep the surroundings of the dismantled rotor free of
magnetic objects, and be careful when placing the
rotor on a magnetic surface.
DANGER
Electric shock
Death or serious personal injury
‐Before starting any work on the product, make sure
that motor cable ends are not live.
‐Make sure that the power supply cannot be
accidentally switched on.
1. Place the motor vertically in a set of jaws (L).
Note: Make sure that the motor is secured in the jaws and it
cannot move.
2. Before dismantling the motor, disconnect the motor cable by
slacking and removing the two screws (220a) and the screw
(25b) holding the earth clamp.
3. Use two screwdrivers to manoeuvre the plug (220) out of its
socket, then pull out the plug.
4. Insert cable plug protection cap (AN).
5. Remove the sand shield (27) and the spacer (27a) from the
shaft.
6. Slacken and remove the four screws (22), and remove the
flange extension (25a).
7. Remove the sand shield (27) from the shaft.
8. Slacken and remove the four screws (50) holding the shaft seal
housing (32).
9. Use two screwdrivers to tip out the shaft seal housing (32).
10. Remove the rotating part of the shaft seal (34).
11. Remove the washer (28) from the shaft.
12. Tilt the motor and drain the motor liquid into a bucket.
13. Turn the motor to vertical position with the NDE facing upwards
and loosen the four screws (46) holding the bottom cover (13).
14. Remove the bottom cover including the diaphragm (12).
15. Turn the motor to horizontal position.
16. Slacken and remove the four screws (48) together with the
clamping flange (7).
17. Press down the shaft adjusting unit (45) against the thrust
bearing to relieve the stress on the retainer spring (49).
18. Use a small screwdriver to push the retainer spring out of the
recess in the stator housing (1) and pull out the shaft adjusting
unit.
19. Slacken and remove the screws (41).
20. Remove the stationary part of the thrust bearing (3) by tilting it
out of its brackets (42).
Note: To remove the 40 kN thrust bearing it may be necessary
to use two screwdrivers to force the thrust bearing out of its
brackets.
21. Pull off the rotating part of the thrust bearing (6). The approach
depends on the size of the thrust bearing.
27 kN thrust bearing
a. Pull off the rotating part of the thrust bearing (6) by using a
puller (O) together with a plug (P).
b. Remove the plug (P).
40 kN thrust bearing
a. Mount the puller (Q) into the rotating part of the thrust bearing
(6) and fasten it with its two screws.
b. Use a hexagon tee key (G) to fasten the two screws in the
puller until the rotating part of the thrust bearing loses the grip
from the conus on the shaft.
c. Remove the puller and the rotating part of the thrust bearing.
22. Remove the stop for bearing bracket(s) (42).
23. Remove the clamping flange (7a) and the NDE radial bearing
(4) from the stator housing.
24. Push the rotor slightly towards the DE in order to loosen the DE
bearing retainer. Pull out the DE radial bearing (5) with a small
screwdriver.
25. Mount centering tool AE and shaft extension tool AH in the
motor DE. Mount centering tool AF and shaft extension tool AG
on the motor NDE. Use the screws of the motor.
26. Carefully push out the rotor (2) from the stator housing, and
place it in a clean place without any loose metal parts or burrs.
Note: It is a permanent magnet rotor!.
27. Remove centering tools AE and AF.
28. Remove the upthrust ring (2a) positioned in the DE of the stator
housing (1). Use a long wooden stick to push out the upthrust
ring.
Note: The upthrust ring can only be removed by pushing it out
from the DE towards the NDE.
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English (GB)

8.1 Component check
Before assembling the motor, clean and check all parts for damage
and wear. All rubber parts must be soft, flexible and intact.
The following components should be checked:
Shaft seal
The sliding surface must be intact and smooth.
NDE and DE radial bearing
The bearings must be intact, smooth and without visible wear.
Shaft with rotor
The radial bearing surfaces on the shaft must be intact, and the
sliding surface must be intact, smooth and without visible wear.
Thrust bearing
The thrust bearing must be intact and the sliding surface must be
intact and smooth.
Upthrust ring
The upthrust ring must be intact and smooth.
Motor liquid
The motor liquid must be clean. Clear the motor when the shaft seal
housing is removed.
Black motor liquid may indicate damaged bearing components.
Diaphragm
The diaphragm must be intact without cracks.
8.2 Replacement of the wear parts
Always replace defective parts with wear part kits. See the
recommended kits and spare parts in the MS Service Kit Catalogue.
Related information
• MS Service Kit Catalogue
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English (GB)

9. Assembling MS6000P (flange extension)
Assemble the motor after the parts are cleaned and checked, and
the defective parts are replaced with new ones.
DANGER
Magnetic field
Death or serious personal injury
‐The rotor dismantled from the motor must never be
handled by a person with a pacemaker.
WARNING
Crushing of fingers
Death or serious personal injury
‐Keep the surroundings of the dismantled rotor free of
magnetic objects, and be careful when placing the
rotor on a magnetic surface.
1. Place the stator housing (1) vertically in the jaws (L) with DE
upwards and tighten it.
2. Mount centering tool AE in the stator housing.
3. Rotate the stator housing (1) 180° and tighten the jaws (L).
4. Insert the upthrust ring (2a) into the stator housing (1) and push
it into place with shaft extension tool AG.
5. Mount centering tool AF in the stator housing.
6. Turn the stator housing to horizontal position.
7. Fit shaft extensions tools AG and AH to the rotor, and carefully
insert the rotor into the stator housing from the NDE.
Note: Pay attention to the magnetic forces when inserting the
shaft with the rotor into the stator housing.
8. Remove shaft extension tools AG and AH and the centering
tools AE and AF.
9. Fit the aligning bracket (T), over the motor head, using two of
the threaded holes and the belonging screws (22). Push the
rotor towards the DE so it touches the bracket.
10. Turn the stator housing to vertical position with the NDE facing
up.
11. Insert the radial bearing NDE (4) into the stator housing and
push it in place with the shaft extension tool AG, if necessary.
12. Insert alignment disc (AI) and fasten it with the 4 positioning
screws (AJ).
13. Use the shaft conical bearing (AK) to align the radial bearing
NDE (4).
14. Remove the alignment disc (AI) and the 4 positioning screws
(AJ).
15. Insert the clamping flange (7a). Make sure that the holes of the
clamping flange are aligned with the threaded holes in the stator
housing (1).
16. Insert the rotation stop for bearing bracket(s) (42).
17. Fasten the bracket(s) and clamping flange with the four screws
(41). Use the torque wrench (AA) and the wrench (AC). See
section 3. Tightening torques and lubricants. Depending on the
size of the thrust bearing, there are different types and numbers
of brackets.
Brackets for 27 kN thrust bearing
Brackets for 40 kN thrust bearing
18. Fit the rotating part of the thrust bearing (6) onto the shaft.
19. Use a plastic mallet (I), and a punch (R or S) according to the
size of the thrust bearing to fix the rotating part on the conus of
the shaft.
Note: The rotating part must be put into the correct position with
one hit, otherwise, the shaft height may change over time
resulting in damage to the thrust bearing.
20. Fit the stationary part of the thrust bearing (3) into the stop for
bearing bracket(s) (42).
Note: As the 40 kN may be difficult to fit, use two screwdrivers
to push the bracket to the sides and manoeuvre the thrust
bearing into the correct position.
21. Fit the shaft adjustment unit (45) into the stator housing.
22. Secure the shaft adjustment unit with a spring retainer (49).
Note: Before fitting the retainer spring, clean the recess to
ensure the retainer spring is in contact with the bottom of the
recess.
23. Insert the clamping flange (7) into the stator housing.
Note: Make sure that the innermost holes are aligned with the
holes in the shaft height adjustment unit (45).
24. Fasten the clamping flange with four screws (48) and cross-
tighten with the specified torque, using a torque screwdriver
(AB). See section 3. Tightening torques and lubricants.
25. Loosen the lock screw (45a) and the shaft adjustment screw
(45b) to have adjustment space (too low shaft height).
26. Turn the stator housing 180° in the jaws, so the DE is facing
upwards.
27. Remove the bracket (T).
28. Carefully insert the radial bearing (5) into the stator housing.
Note: Position the radial bearing so it is not resting on the taps
of the upthrust ring when the shaft seal housing is mounted. If
the radial bearing is in the correct position, it drops down when
turned with a screwdriver.
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English (GB)

29. Make sure the radial bearing is centered in the stator housing.
Position assembly tool AL over the shaft and on the top of the
stator housing. Use a plastic mallet (I) and a punch (V) to drive
the assembly tool AL against the mounting face for the shaft
seal housing.
30. Remove assembly tool AL from the shaft.
31. Check the shaft height using a depth gauge (K) or a shaft height
gauge (Z). The shaft height must be within 72.8 ± 0.2 mm. See
the figure below.
Note: Make sure that the depth gauge is square between the
shaft end and the motor flange.
72.8±0.2
72.8±0.2
32. To adjust the shaft height, attend to the NDE of the motor and
adjust the height by turning the screw (45b) with the shaft height
adjustment spanner (U).
1
2
2
45a
45b
33. When the shaft is adjusted to the correct height, tighten the lock
screw with the specified torque using a torque screwdriver
(AB). See section 3. Tightening torques and lubricants.
34. Turn the stator housing to horizontal position.
35. Fit the diaphragm (12) and the end cover (13). Fasten them with
the four belonging screws (46).
Note: Nylon washers must be renewed on all screws
36. Cross-tighten the screws with the specified torque, using a
torque screwdriver (AB). See section 3. Tightening torques and
lubricants.
37. Turn the stator housing to vertical position, with the DE facing
upwards.
38. Use the spline head driver (Y) to check that the shaft rotates
freely.
39. Fill motor liquid (SML-3) into the stator housing until it is full.
40. Move the shaft up and down and rotate the shaft to let air
escape.
41. Refill the stator housing with motor liquid, if necessary.
42. Slide the washer (28) down on the shaft, so it is positioned in
the recess of the radial bearing.
43. Lubricate the rotating part of the shaft seal (34) and the shaft
with motor liquid.
44. Fit the rotating part of the shaft seal onto the shaft and press it
down using a punch (V).
45. Lubricate the recess inside the shaft seal housing (32) and the
outer surface of the stationary part of the shaft seal (33). See
section 3. Tightening torques and lubricants.
46. Press the stationary part of the shaft seal (33) into the recess of
the shaft seal housing, using the punch (V).
Note: On the MS6000 R version, press a lip seal (32a) into the
shaft seal housing before inserting the stationary part of the
shaft seal.
47. Fit the shaft seal housing with an O-ring (24) and lubricate
it. See section 3. Tightening torques and lubricants.
48. Fit the shaft seal housing (32) into the top of the motor and
press it down into place by using the punch for shaft seal (V).
49. Fit the four screws (50) into the shaft seal housing and cross-
tighten them in two steps. First, cross-tighten with a screwdriver
and then with the specified torque, using a torque screwdriver
(AB). See section 3. Tightening torques and lubricants.
50. Top up the motor liquid, see section 10. Filling procedure with a
syringe.
51. Fit the sand shield (27) on the shaft and push it down to the
shaft seal housing (32). Make sure that the steel ring inside the
sand fighter is facing the shaft seal housing.
52. Mount the flange extension (25a) onto the motor head.
53. Fasten the flange extension with the four screws (22) including
the washers (21).
54. Cross-tighten the screws using a torque wrench combined with
the machined Torx 50 head driver (M) or ring spanner (N). See
section 3. Tightening torques and lubricants.
55. Fit the spacer for the sand shield (27a) on the shaft and push it
down until touching the sand shield (27) from step 51.
56. Fit the sand shield (27) on the top of the spacer for the sand
shield (27a).
57. Remove the cable plug protection cap (AN).
58. Insert the motor cable plug (220) into the cable socket.
Note: For proper sealing, always use a new motor cable.
59. Tighten the screws for the motor cable (220a) with the specified
torque, using a torque screwdriver (AB). See section 3.
Tightening torques and lubricants.
60. Mount the screw (25b) that secures the earth plate of the cable
plug to the flange extension.
61. Tighten this screw with the specified torque using a torque
screwdriver (AB). See section 3. Tightening torques and
lubricants.
62. Perform a final check, see section 11. Final check.
Related information
3. Tightening torques and lubricants
10. Filling procedure with a syringe
11. Final check
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English (GB)

10. Filling procedure with a syringe
For a correct filling, evacuate the air inside the motor and replace it
with motor liquid. Verify that the cable plug protection cap (AN) is
correctly placed on the cable socket.
1. Incline the motor approximately 30°, so that the filling hole is at
the highest point of the motor.
2. Remove the filling screw (22a).
3. Turn the shaft and inject motor liquid by using a filling syringe
(W) until its full.
4. Fill the syringe halfway with motor liquid.
5. Press the syringe against the filling hole in order to make full
contact and good sealing properties.
6. Pull back the plunger of the syringe so air is evacuated from
inside the motor.
7. Press back the plunger to replace air with motor liquid.
8. Repeat this filling procedure until all air in the motor is
completely evacuated and replaced with motor liquid.
9. Refit the filling screw.
Note: Nylon washer must be renewed.
Note: Motor liquid must not reach the plug hole. Use air gun to
clean the surface before removing the cable plug protection cap
(AN).
Related information
7. Assembling MS6000P
9. Assembling MS6000P (flange extension)
11. Final check
1. Check that the shaft rotates freely and quietly:
• Use the spline head driver (Y) combined with a torque
screwdriver to check the torque for rotating the shaft. Rotate
the shaft slowly with at least one revolution without exceeding
2.5 Nm.
2. Check the axial clearance:
• Place the motor in horizontal position. Grab the shaft and
move it forwards and backwards. The clearance must be 1 to
2 mm.
Related information
7. Assembling MS6000P
9. Assembling MS6000P (flange extension)
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English (GB)

12. Maintenance and service
WARNING
Toxic material
Death or serious personal injury
‐If a motor is used in a liquid that is contagious or toxic,
the motor is classified as contaminated.
Before returning the product for service, contact Grundfos with
details about the pumped liquid. Otherwise, Grundfos can deny
servicing the product. Any application for service must include
details about the pumped liquid. Possible costs of returning the
motor are to be paid by the customer.
12.1 Fault finding the product
12.1.1 The motor does not run
Cause Remedy
No power supply. Replace the fuses. Check the electrical installation and the
submersible drop cable if the new fuses burn as well.
The ELCB or the voltage-operated ELCB is tripped out. Cut in the circuit breaker.
VFD is defective. Repair/replace the VFD.
The control circuit in the VFD cut out or is defective. Check the electrical installation.
Motor/drop cable is defective. Repair/replace the motor/drop cable.
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English (GB)