Manuals+

Grundfos CR, CR 3, CR 5 Model A Service Instructions

1. Type Identification

This section details the type key, nameplate, and codes that may appear in the variant code. Note that codes can be combined, and a code position might contain more than one letter.

1.1 Nameplate

The nameplate displays various specifications of the pump. The following table lists the positions and their corresponding descriptions:

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
6 P2, 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)

1.2 Type key

The type key is used to identify specific pump configurations. An example is provided:

Example: CR 3 - 10 X- X- X- X- XXXX

The type key consists of the following elements:

2. Tightening torques and lubricants

This section provides a table detailing the correct tightening torques and recommended lubricants for various components.

Pos. Description Number Dim. Torque [Nm] Lubricant
7a Screw 4 M4 2
M6 13
9 Hexagon socket head screw 4 M8 31 THREAD-EZE
M10 62
18 Air vent screw (spindle) 1 1/2" (M8) 35 (3)
23 Plug 1 1/2" 35 Soapy water
25 Drain plug with bypass valve (spindle) 1 1½" (M10) 35 (5)
26 Staybolt 4 M12 THREAD-EZE
28 Hexagon head screw 4 M6 10
M8 12 THREAD-EZE
35 Hexagon head screw 4 M10 40
M12 23 THREAD-EZE
36 Nut 4 M12 50 THREAD-EZE
37 O-ring 2 Ø137.5 x 3.3 Rocol 22
47a Bearing ring Rocol 22
67 Lock nut 1 M8 18 Gardolube L 6034
105 Shaft seal 1 M28 35
113 Set screw 3 M5 2.5 THREAD-EZE

Note: THREAD-EZE part no. 96611372 (0.5l), Gardolube L 6034 part no. SV9995 (1 l), Rocol 22 part no. RM2924 (1 kg).

3. Service tools

This section details the special and standard tools required for servicing the pump.

3.1 Special tools

The following special tools are recommended:

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

3.2 Standard tools

Commonly available standard tools can also be used:

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
J Hexagon bit 5 M6 - 5 mm 1/4" SV2012
6 9-H M8 - 6 mm 1/4" SV0083
8 M10 - 8 mm 1/4" SV0055
113-H-M M5 - 2.5 mm 1/4" SV0056
K Ring/open-end spanner 28 M6 - 10 mm SV0054
28-67 M8 - 13 mm SV0122
35 M10 - 17 mm
28-36 M12 - 19 mm
18-23-25 M16 - 24 mm

3.3 Torque tools

Torque wrenches and screwdrivers are essential for accurate assembly:

Pos. Description For pos. Suppl. information Part no.
L Torque wrench 4-20 Nm 9 x 12 SV0292
N-O 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 M6 - 5 mm 1/2" x 1/2" SV0296
9-N M8 - 6 mm 1/2" x 1/2" SV0297
M10 - 8 mm 1/2" x 1/2" SV0298
Q Socket spanner, purpose-ground 67-L M8 - 13 mm 9 x 12 SV2013

4. Dismantling and assembly

4.1 General

If the pump needs to be dismantled due to choking or damage, follow the instructions in the subsequent sections. Position numbers (digits) refer to exploded views, sectional drawings, and parts lists. Tool positions (letters) refer to Section 3, Service tools.

4.1.1 Before dismantling

4.1.2 Before assembly

4.1.3 During assembly

4.1.4 After assembly

4.2 Replacement of motor

4.2.1 Dismantling

  1. Slacken and remove the screws (pos. 7a) together with the coupling guard (pos. 7).
  2. Slacken and remove the screws (pos. 9) together with the coupling halves (pos. 10a) and the shaft pin (pos. 10).
  3. Slacken and remove the screws (pos. 28).
  4. 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. 1.
  6. Fit the coupling guard (pos. 7) and the screws (pos. 7a).

Fig. 1: Illustration showing the coupling halves fitted onto the shaft, with screws tightened, and a note to check that the gaps on either side of the coupling halves are equal.

4.3 Replacement of shaft seal

4.3.1 Dismantling

  1. Remove the motor and the coupling. Refer to Section 4.2.1 Dismantling.
  2. Slacken the three screws (pos. 113) by approximately a quarter 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. 1.
  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 the stop. See Fig. 2.
  9. Lower the shaft/the coupling to half that height. See Fig. 2.
  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. 1.
  11. Tighten the three screws (pos. 113) to the correct torque.
  12. Fit the coupling guard (pos. 7) and the screws (pos. 7a).

Fig. 2: Illustration showing the action of inserting a screwdriver to raise the shaft/coupling against a stop, and then lowering it to half height for tightening.

4.4 Dismantling and assembly of pump main parts

4.4.1 Dismantling

  1. Remove the shaft seal. Refer to Section 4.3.1 Dismantling.
  2. Slacken and remove the screws (pos. 36) together with the washers (pos. 66a).
  3. 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.
  4. 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.
  5. Remove the outer sleeve (pos. 55).
  6. 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 using the tool (pos. E). The O-ring (pos. 37) must be lubricated. Refer to Section 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 onto the pump with the air vent screw (pos. 18) in the required direction. The O-ring (pos. 37) must be lubricated. Refer to Section 2, Tightening torques and lubricants.
  5. Lubricate the threads of the staybolts. Refer to Section 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.

4.5 Dismantling and assembly of chamber stack

4.5.1 Dismantling

  1. Remove the chamber stack. Refer to Section 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. 3. Tighten the vice.
  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. Refer to Section 5, Order of assembly for chambers and impellers.

Fig. 3: Illustration showing the shaft holder secured in a vice, with the shaft pin inserted and the chamber stack placed within the holder.

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. Refer to Section 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, ensure they are fitted correctly. See Fig. 4.
  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.

Fig. 4: Illustration showing the washer (pos. 66) and emphasizing that it consists of two washers glued together, requiring correct fitting.

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 the flange connection, if any: For oval flanges, slacken and 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. 5.
  2. Fit the flange connection, if any: For oval flanges, fit the gasket (pos. 39), the flange (pos. 12), and the screws (pos. 35).
  3. Lubricate the threads of the staybolts. Refer to Section 2, Tightening torques and lubricants, and fit the staybolts into 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.

Fig. 5: Illustration showing the O-ring (pos. 37) being fitted into the base using the O-ring tool (pos. G).

4.6.4 Assembly of pump head

  1. Fit the O-rings (pos. 100) onto 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. 6.
  3. Fit the O-ring (pos. 37) using the tool (pos. G). See Fig. 5.

Fig. 6: Illustration showing the corrugated spring (pos. 60) being fitted into the pump head using the tool (pos. F).

4.7 Checking and replacing parts

Impeller

Check: Determine if the impeller needs replacement due to friction between the neck ring and the impeller skirt. If wear has caused a noticeable groove (detectable by fingernail) in the impeller skirt, the impeller should be replaced.

Replace: Neck ring/retainer for neck ring.

  1. Prise the retainer for the 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. 7.
  4. Press a new retainer for the neck ring down onto the neck ring and into the chamber.

Neck rings and retainers for neck rings should always be replaced when the chamber stack is dismantled. It must be possible to move the neck ring freely (sideways) between the retainer and the chamber.

Fig. 7: Diagram illustrating the impeller, neck ring, and retainer, showing the check for wear and the replacement procedure.

Bearing rings

Check: Check for a visible and noticeable edge (detectable by fingernail) on the rotating bearing ring.

Replace: Replace both bearing rings (pos. 47a) and the chamber with bearing ring (pos. 4a).

5. Order of assembly for chambers and impellers

To determine the correct assembly order, first identify the pump type (CR 1, CR 3, or CR 5) and the stage variant. Then, find the pump in the relevant stage survey table. The symbol survey indicates the components for each stage.

5.1 CR 1 and CR 3

Stage survey for CR/CRI/CRN 1 & 3:

2 3 4 5 6 7 8 9 10 11 12 13 15 17 19 21 23 25 27 29 30 31 33 36
1○★★★★★★★★★★★★★★★★★★★★★★★
2★★
3★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★*****★★★★★★****
4
5★★★
6★★★★
7★★
8**
9★★★★★★
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

Symbol survey:

5.2 CR 5

Stage survey for CR/CRI/CRN 5:

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 20 22 24 26 29 32 36
1•
2○★★
3********○★★★★★★★★★★★★★★★★★★★★★○★★★★★★★★★★★★★★★★★★★★
4★★★★★★★★★
5★★★★★★★
6Ο★○★★★★★★******
7★★★C○★★○★★○★★★★★○★★★★★★★★★****<★★★★★★★**★★★○★★Ο★★★★★★★★★★★★★★★★★★★★★★★
8★★
9★★
10★★
11★
12
13★★
14★★
15★★
16*****
17
18*****
19★★★
20★★
21★★★★★
22★
23○★★
24★★★★Ο
25★★
26***
27
28Ο★
29★★
30★★
31○★
32
33★
34★
35Ο
36

Symbol survey:

6. Drawings

6.1 CR, CRI, CRN 1, 3

Exploded view: This diagram shows a detailed breakdown of the CR, CRI, CRN 1 and 3 pump components, illustrating the motor, pump head, chambers, impellers, and various seals and fasteners, with each part clearly numbered for reference.

Sectional drawing: This diagram provides a cross-sectional view of the pump, illustrating the internal arrangement of components such as impellers, chambers, shaft, seals, and motor, showing how they interact during operation.

6.2 CR, CRI, CRN 5

Exploded view: This diagram presents a detailed breakdown of the CR, CRI, CRN 5 pump components, similar to the 1, 3 series, showing the motor, pump head, chambers, impellers, and various seals and fasteners, with each part clearly numbered.

Sectional drawing: This diagram offers a cross-sectional view of the CR, CRI, CRN 5 pump, detailing the internal configuration of impellers, chambers, shaft, seals, and motor, demonstrating their functional relationships.

PDF preview unavailable. Download the PDF instead.

Grundfosliterature-79597 Acrobat Distiller 7.0 (Windows) FrameMaker 7.0

Related Documents

Preview Grundfos Solar Surface Pump: Installation and Operating Instructions
This manual provides comprehensive guidance for the installation and operation of Grundfos solar surface pumps (CR, CRI, CRN series), covering product identification, application, installation, operation, maintenance, and troubleshooting for optimal performance and safety.
Preview Grundfos CR, CRI, CRN Series Pumps: Installation and Operating Instructions
This guide provides essential information for the safe and effective installation and operation of Grundfos CR, CRI, and CRN series multistage centrifugal pumps. It covers handling, technical data, installation procedures, electrical connections, startup, maintenance, and troubleshooting.
Preview Grundfos CM 10-1 A-R-A-E-AQQE F-A-A-N Centrifugal Pump Technical Specification
Comprehensive technical data and product overview for the Grundfos CM 10-1 A-R-A-E-AQQE F-A-A-N centrifugal pump. Details include pump and motor specifications, materials, installation requirements, electrical data, and dimensional information.
Preview Grundfos Hydro MPC Service Instructions
Detailed service instructions and technical manual for the Grundfos Hydro MPC booster system, covering type identification, technical data, terminal functions, fault correction, and configuration procedures.
Preview Grundfos CRT Installation and Operating Instructions
Comprehensive guide for the installation and operation of Grundfos CRT pumps, covering technical specifications, electrical connections, maintenance, and troubleshooting.
Preview Grundfos ZAR Price List 2021: Pumps and Water Systems Catalog
Official Grundfos South Africa ZAR Rand price list for January 2021, featuring a comprehensive catalog of submersible pumps, booster pumps, dosing pumps, motors, and accessories. Find model numbers, part numbers, and pricing.
Preview Grundfos ALPHA2 L Model C Circulator Pump: Installation and Operating Instructions
Comprehensive instructions for the Grundfos ALPHA2 L Model C circulator pump, covering installation, operation, safety, and technical specifications. Learn how to install and use your Grundfos pump efficiently.
Preview Grundfos SCALA Multistage Centrifugal Boosters Data Booklet
This data booklet provides comprehensive information on Grundfos SCALA multistage centrifugal boosters, including product ranges, installation, operation, selection guides, technical data, and accessories for SCALA1 and SCALA2 models.