Grundfos A Series Operating instructions

Service instructions
CRE 1, CRE 3 and CRE 5
Model A
50/60 Hz
1/3~
96547191 0407 GB 1 / 15
1. Type identification........................................................................................................................... 2
1.1 Nameplate ...........................................................................................................................................................2
1.2 Type key..............................................................................................................................................................3
2. Tightening torques and lubricants................................................................................................. 4
3. Service tools .................................................................................................................................... 5
3.1 Special tools ........................................................................................................................................................5
3.2 Standard tools......................................................................................................................................................6
3.3 Torque tools.........................................................................................................................................................6
4. Dismantling and assembly ............................................................................................................. 7
4.1 General................................................................................................................................................................7
4.2 Replacement of motor .........................................................................................................................................8
4.3 Replacement of shaft seal...................................................................................................................................9
4.4 Dismantling and assembly of pump main parts.................................................................................................10
4.5 Dismantling and assembly of chamber stack ....................................................................................................11
4.6 Dismantling and assembly of base and pump head..........................................................................................12
4.7 Checking and replacing parts............................................................................................................................13
5. Order of assembly for chambers and impellers ......................................................................... 14
5.1 CRE 1 and CRE 3..............................................................................................................................................14
5.2 CRE 5................................................................................................................................................................15

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1. Type identification
This section shows the type key, the nameplate and the codes that can appear in the variant code.
Note: As codes can be combined, a code position may contain more than one letter.
1.1 Nameplate
TM02 1628 1701
Pos. Description Pos. Description
1 Type designation. See 1.2 Type key 10 Head at rated flow rate, 50 Hz
2 Model 11 P2, 60 Hz
3 Product number 12 Speed, 60 Hz
4 Place of production 13 Head against closed valve, 60 Hz
5 Production year and week 14 Rated flow rate, 60 Hz
6P2, 50 Hz 15 Head at rated flow rate, 60 Hz
7 Speed, 50 Hz 16 Maximum pressure and temperature
8 Head against closed valve, 50 Hz 17 Country of production
9 Rated flow rate, 50 Hz 18 Direction of rotation (CCW = counterclockwise)
Model
50Hz 60Hz
mm
m
o
bar / C
3
m/h
96439820
-1
min
-1
min
nn
kW kW
P
2 P 2
Type
max max
HH
QQ
m
H max H max
33
m/h
CRE5-10 AN-FGJ-A-E-HUB
A96459132P10117
1.50
2900
68
5.7
49.8
25/120
MADE IN DENMARK
1.50
2900
68
5.7
49.8
CCW
12345
17 1816
11
12
13
14
15
6
7
8
9
10

3 / 15
1.2 Type key
Example CRE 5 - 10 X- X- X- X- XXXX
Type range
Rated flow rate in m³/h
Number of stages
Code for pump version
A = Basic version
G = Pump for booster system
N = Pump with pressure sensor
U = NEMA version
Code for pipe connection
A = Oval flange
FGJ = DIN, ANSI and JIS flange
Code for pump materials
A = Pump head and base: Cast iron
Other wetted parts: Stainless steel
DIN W.-Nr. 1.4301
Code for rubber parts
E = EPDM
V = FKM
Code for shaft seal
HUBE/V = Balanced cartridge seal; rotating face: tungsten carbide;
stationary seat: resin-impregnated carbon;
O-rings, see code for rubber parts.
HUUE/V = Balanced cartridge seal; rotating face: tungsten carbide;
stationary seat: tungsten carbide;
O-rings, see code for rubber parts.

4 / 15
2. Tightening torques and lubricants
THREAD-EZE, part no. SV9997 (0.5 l).
Gardolube L 6034, part no. SV9995 (1 l).
Rocol 22, part no. RM2924 (1 kg).
Pos. Description Number Dim. Torque [Nm] Lubricant
7a Screw 4 M4 2
9 Hexagon socket head screw 4
M6 13
THREAD-EZEM8 31
M10 62
18 Air vent screw (spindle) 1 ½" (M8) 35 (3)
Soapy water23 Plug 1 ½" 35
25 Drain plug with bypass valve (spindle) 1 ½" (M10) 35 (5)
26 Staybolt 4 M12 THREAD-EZE
28 Hexagon head screw 4
M6 10
THREAD-EZEM8 12
M12 40
35 Hexagon head screw 4 M10 23 THREAD-EZE
36 Nut 4 M12 50 THREAD-EZE
37 O-ring 2 ø137.5 x 3.3 Rocol 22
47a Bearing ring See 5. Order of assembly for chambers and impellers Rocol 22
67 Lock nut 1 M8 18 Gardolube L 6034
105 Shaft seal 1 M28 35
113 Set screw 3 M5 2.5

5 / 15
3. Service tools
3.1 Special tools
TM02 0846 0401
Pos. Description For pos. Suppl. information Part no.
A Shaft holder for assembly SV0040
B Tubular box spanner for shaft seal 105 SV2007
C Puller 65 SV0239
D Circlip pliers (not used for CR) SV2014
E Tool for outer sleeve 55 V7170478
F Tool for corrugated spring 60 V7170227
G Tool for O-ring 37 V7170230

6 / 15
3.2 Standard tools
3.3 Torque tools
Pos. Description Bit no. For pos. Suppl. information Part no.
H Bit holder I-J 1/4" SV2011
I Bits kit
PZ2 7a 1/4"
SV2010
5
9-H
M6 - 5 mm 1/4"
6 M8 - 6 mm 1/4"
8 M10 - 8 mm 1/4"
J Hexagon bit 113-H-M M5 - 2.5 mm 1/4" SV2012
K Ring/open-end spanner
28 M6 - 10 mm SV0083
28-67 M8 - 13 mm SV0055
35 M10 - 17 mm SV0056
28-36 M12 - 19 mm SV0054
18-23-25 M16 - 24 mm SV0122
Pos. Description For pos. Suppl. information Part no.
L Torque wrench N-O
4-20 Nm 9 x 12 SV0292
20-100 Nm 9 x 12 SV0269
40-200 Nm 14 x 18 SV0400
M Torque screwdriver J 1-6 Nm 1/4" SV0438
N Ratchet insert tool L-O-P 9 x 12 -> 1/2" SV0295
O Ring insert tool
28-L M6 - 10 mm 9 x 12 SV0310
28-L M8 - 13 mm 9 x 12 SV0294
28-L M10 - 17 mm 9 x 12 SV0270
36-L M12 - 19 mm 9 x 12 SV0271
18-23-25-L M16 - 24 mm 9 x 12 SV0524
P Hexagon socket driver 9-N
M6 - 5 mm ½" x ½" SV0296
M8 - 6 mm ½" x ½" SV0297
M10 - 8 mm ½" x ½" SV0298
Q Socket spanner, purpose-ground 67-L M8 - 13 mm 9 x 12 SV2013

7 / 15
4. Dismantling and assembly
4.1 General
If it is necessary to dismantle the pump, either because it is choked or damaged, please follow the instructions in the
following sections.
Position numbers of parts (digits) refer to exploded views, sectional drawings and parts lists; position numbers of tools
(letters) refer to 3. Service tools.
4.1.1 Before dismantling the pump
• Disconnect the electricity supply to the motor.
• Close the isolating valves, if fitted, to avoid draining the system.
•Remove the electric cable in accordance with local regulations.
• Note the centre of gravity of the pump to prevent it from overturning. This is especially important in the case of long
pumps.
4.1.2 Before assembly
• Clean and check all parts.
• Order the necessary service kits.
• Replace defective parts by new parts.
• Gaskets and O-rings should always be replaced when the pump is overhauled.
4.1.3 During assembly
• Lubricate and tighten the screws and nuts to correct torque as stated in 2. Tightening torques and lubricants.
4.1.4 After assembly
• The pump should be tested according to test specification 96446769.

8 / 15
4.2 Replacement of motor
4.2.1 Dismantling
1. Disconnect the pressure sensor, if fitted, from the terminal box of the motor. See fig. 1.
Fig. 1
2. Slacken and remove the screws (pos. 7a) together with the coupling guard (pos. 7)
3. Slacken and remove the screws (pos. 9) together with the coupling halves (pos. 10a) and the shaft pin
(pos. 10).
4. Slacken and remove the screws (pos. 28).
5. Lift the motor off the pump head (pos. 2).
4.2.2 Assembly
1. Fit the motor to the pump head.
2. Fit the screws (pos. 28) and tighten diagonally to the correct torque.
3. Fit the shaft pin (pos. 10) into the shaft pin hole.
4. Fit the coupling halves (pos. 10a) on the shaft and fit the screws (pos. 9). Tighten the screws and leave loose.
Check that the gaps either side of the coupling halves are equal.
5. Tighten the screws (pos. 9) diagonally to the correct torque.
Check that the gaps either side of the coupling halves are equal. See fig. 2.
Fig. 2
6. Fit the coupling guard (pos. 7) and the screws (pos. 7a).
7. Connect the pressure sensor, if any, to the terminal box of the motor. See fig. 1.
TM02 1629 1701
87
Black
Brown Brown (8)
Black (7)
MGE 71, MGE 80 MGE 90, MGE 100, MGE 112, MGE 132

9 / 15
4.3 Replacement of shaft seal
4.3.1 Dismantling
1. Remove the motor and the coupling. See 4.2.1 Dismantling.
2. Slacken the three screws (pos. 113) by approx. a ¼ of a turn so that the shaft seal is just free of the shaft.
3. Slacken the shaft seal (pos. 105) using the box spanner (pos. B) until the thread is completely free of the
pump head.
4. Pull the shaft seal off the shaft.
4.3.2 Assembly
1. If necessary, clean and smooth the shaft end using the holder with emery cloth supplied with the shaft seal kit.
2. Moisten the shaft end with soapy water.
3. Place the shaft seal in the box spanner (pos. B) and press it down on the shaft.
4. Screw the shaft seal into the pump head and tighten it to the correct torque.
5. Fit the shaft pin (pos. 10) into the shaft pin hole and fit the coupling halves (pos. 10a) on the shaft. Fit the
screws (pos. 9), tighten and leave loose.
Check that the gaps either side of the coupling halves are equal. See fig. 2.
6. Fit the motor to the pump head.
7. Fit the screws (pos. 28) and tighten diagonally to the correct torque.
8. Insert a suitable screwdriver between the bottom of the coupling and the shaft seal, and raise the shaft/the
coupling against stop. See fig. 3.
Fig. 3
9. Lower the shaft/the coupling to half that height. See fig. 3.
10.Hold the shaft/the coupling in this position and tighten the four screws in the coupling (pos. 9) to the correct
torque.
Check that the gaps either side of the coupling halves are equal. See fig. 2.
11.Tighten the three screws (pos. 113) to the correct torque.
12.Fit the coupling guard (pos. 7) and the screws (pos. 7a).
13.Connect the pressure sensor, if any, to the terminal box of the motor. See fig. 1.
TM02 0462 4600
0.5x
x

10 / 15
4.4 Dismantling and assembly of pump main parts
4.4.1 Dismantling
1. Remove the shaft seal. See 4.3.1 Dismantling.
2. Remove the pressure sensor, if fitted, from the pump head (pos. 2).
3. Slacken and remove the screws (pos. 36) together with the washers (pos. 66a).
4. Loosen the pump head (pos. 2) with a light blow on the edge and lift it free of the staybolts (pos. 26). The top
guide vanes/discharge part (pos. 50a) may stick to the pump head.
5. Loosen the top guide vanes/discharge part (pos. 50a) with a light blow of a rubber mallet if it was not removed
with the pump head.
6. Remove the outer sleeve (pos. 55).
7. Lift the chamber stack off the base. If the bottom chamber (pos. 5a) is removed with the chamber stack,
loosen it from the chamber stack; otherwise loosen it from the base (pos. 6).
4.4.2 Assembly
1. Fit the chamber stack in the base. The smooth shaft end must be upwards.
2. Fit the outer sleeve (pos. 55) in the base and press it home in the base using the tool (pos. E).
The O-ring (pos. 37) must be lubricated. See 2. Tightening torques and lubricants.
3. Press the top guide vanes/discharge part (pos. 50) into the recess of the top chamber.
4. Fit the pump head on the pump with the air vent screw (pos. 18) in the direction required.
The O-ring (pos. 37) must be lubricated. See 2. Tightening torques and lubricants.
5. Lubricate the threads of the staybolts. See 2. Tightening torques and lubricants.
6. Fit the washers (pos. 66a) and the nuts (pos. 36).
7. Tighten the nuts (pos. 36) diagonally to the correct torque.
8. Fit the pressure sensor, if any, to the pump head (pos. 2).

11 / 15
4.5 Dismantling and assembly of chamber stack
4.5.1 Dismantling
1. Remove the chamber stack. See 4.4.1 Dismantling.
2. Place the shaft holder (pos. A) in a vice, but do not tighten the vice.
3. Fit the shaft pin (pos. 10) into the shaft pin hole and place the chamber stack in the shaft holder (pos. A).
See fig. 4. Tighten the vice.
Fig. 4
4. Remove the nut (pos. 67), the washer (pos. 66) and the clamp (pos. 64c).
5. Remove the chamber stack components: impeller, chamber, bearing ring and spacing pipe. See 5. Order of
assembly for chambers and impellers.
4.5.2 Assembly
1. Place the shaft holder (pos. A) in a vice, but do not tighten the vice.
2. Fit the shaft pin (pos. 10) into the shaft pin hole and place the shaft in the shaft holder (pos. A). Tighten the
vice.
3. Fit the components on the shaft: impeller, chamber, spacing pipe and bearing ring. See 5. Order of assembly
for chambers and impellers.
4. Fit the clamp (pos. 64c), the washer (pos. 66) and the nut (pos. 67). Tighten to the correct torque.
The washer (pos. 66) consists of two washers glued together. If they have been separated, make sure that
they are fitted correctly. See fig. 5.
Fig. 5
5. Slacken the vice and remove the chamber stack and the shaft pin (pos. 10).
6. Place the bottom chamber (pos. 5a) on the chamber stack.
TM02 1056 0501TM02 1057 0501

12 / 15
4.6 Dismantling and assembly of base and pump head
4.6.1 Dismantling of base
1. Remove the staybolts (pos. 26) from the base (pos. 6).
2. Remove flange connection, if any:
Oval flange: Remove the screws (pos. 35), the flange (pos. 12) and the gasket (pos. 39).
3. Remove the drain plug (pos. 25) and the O-ring (pos. 38).
4. Remove the O-ring (pos. 37).
4.6.2 Dismantling of pump head
1. Remove the air vent screw (pos. 18), the plug (pos. 23) and the O-ring (pos. 100).
2. Remove the O-ring (pos. 37).
3. Remove the corrugated spring (pos. 60).
4.6.3 Assembly of base
1. Fit the O-ring (pos. 37) using the tool (pos. G). See fig. 6.
Fig. 6
2. Fit the flange connection, if any:
Oval flange: Fit the gasket (pos. 39), the flange (pos. 12) and the screws (pos. 35).
3. Lubricate the threads of the staybolts, see 2. Tightening torques and lubricants, and fit the staybolts in the
base (pos. 6). Tighten the staybolts using your fingers.
4. Fit the O-ring (pos. 38) on the drain plug (pos. 25) and fit the plug into the base.
4.6.4 Assembly of pump head
1. Fit the O-rings (pos. 100) on the air vent screw (pos. 18) and the plug (pos. 23). Fit the screw and the plug into
the pump head.
2. Fit the corrugated spring (pos. 60) in the pump head using the tool (pos. F). See fig. 7.
Fig. 7
3. Fit the O-ring (pos. 37) using the tool (pos. G). See fig. 6.
TM02 1055 0501TM02 0462 4600

13 / 15
4.7 Checking and replacing parts
Fig. 8
Check Replace
Impeller Neck ring/retainer for neck ring
• Check whether it is necessary to replace the impeller
due to friction between the neck ring and the impeller
skirt.
If wear has caused a noticeable (use a finger nail)
groove in the impeller skirt, the impeller should be
replaced.
Neck rings and retainers for neck rings should always
be replaced when the chamber stack is dismantled.
1. Prise the retainer for neck ring (pos. 65) up and free
of the chamber using the puller (pos. C).
2. Remove the neck ring (pos. 45).
3. Fit a new neck ring into the chamber.
See fig. 8.
4. Press a new retainer for neck ring down on the neck
ring and into the chamber.
It must be possible to move the neck ring freely (sideways)
between the retainer and the chamber.
Bearing rings
• Check whether there is a visible and noticeable (use a
finger nail) edge on the rotating bearing ring. • Replace both bearing rings (pos. 47a) and the chamber with bearing ring (pos. 4a).
TM02 1182 0601

14 / 15
5. Order of assembly for chambers and impellers
1. Determine the pump type (CRE 1, CRE 3 or CRE 5) and the stage variant. Find the pump in the relevant stage
survey table.
2. Find the components of each stage in the symbol survey.
5.1 CRE 1 and CRE 3
TM02 0445 1701
245 7 15 19212331366 1317 33292725
CR / CRI / CRN 1 & 3-
9
8
7
6
5
4
1
3
2
310812119
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
30
66
64c
67
4a
47a
64a
4
49
64 64
4
49 49
Symbol survey
Stage survey

15 / 15
5.2 CRE 5
TM02 0444 4600
245 7 14 161820 29 366 1315 32262422
CR / CRI / CRN 5 -
9
8
7
6
5
4
1
3
2
310812119
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
49
67
64c
64d
6666
64c
67
4949
69
64a
47a
4a
4a
47a
64a
49
69
49
64
44
64
49
Symbol survey
Stage survey