English (GB)
3
English (GB) Service instructions
Original service instructions
CONTENTS
Page
1. Symbols used in this document
2. General information
Position numbers of parts (digits) refer to drawings in section
8. Exploded views; position numbers of tools (letters) refer to
section 5. Service tools.
Electrical parts must only be serviced by Grundfos or an
authorised service workshop.
Before dismantling
• Close the isolating valves, if fitted, and make sure that they
cannot be accidentally opened.
• Before starting work on the product, let the product and
pumped liquid cool off.
• Note the centre of gravity of the pump to prevent it from
overturning. This is especially important in the case of long
pumps.
• Disconnect the electricity supply to the motor.
Before assembly
• Clean and check all parts.
• Replace defective parts with new parts.
• Order the necessary service kits.
• Always replace gaskets and O-rings.
During assembly
• Lubricate and tighten screws and nuts according to section
4. Torques and lubricants.
After assembly
• If analog or digital inputs, the relay output or the CIM module
has been removed from the pump, you must check the
communication with external units after service.
Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
– Use the public or private waste collection service.
– If this is not possible, contact the nearest Grundfos company
or service workshop.
1. Symbols used in this document 3
2. General information 3
3. Identification 4
3.1 Nameplate 4
3.2 Type key 5
3.3 Code for shaft seal 6
4. Torques and lubricants 7
5. Service tools 8
5.1 Special tools 8
5.2 Standard tools 9
5.3 Torque tools 9
6. Dismantling and assembly 10
6.1 General information 10
6.2 Replacement of motor 10
6.3 Replacement of motor stool 11
6.4 Replacement of coupling 11
6.5 Replacement of shaft seal 11
6.6 Replacement of pump head 12
6.7 Replacement of chamber stack 13
6.8 Chamber stack 13
6.9 Pump head and shaft seal 14
6.10 CRN 32 SF order of assembly 15
6.11 CRN 45 SF order of assembly 16
6.12 CRN 64 SF order of assembly 17
6.13 CRN 90 SF order of assembly 18
7. Positions 19
8. Exploded views 20
Warning
Prior to service work, read these service instructions
carefully. Installation and 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.
Warning
If these safety instructions are not observed, it may
result in personal injury.
If these safety instructions are not observed, it may
result in malfunction or damage to the equipment.
Notes or instructions that make the job easier and
ensure safe operation.
Warning
Use personal protective equipment if there is a risk of
getting into contact with the pumped liquid.
Observe local regulations.
Warning
Switch off the power supply and make sure that it
cannot be accidentally switched on.
Check that other pumps or sources do not force flow
through the pump even if the pump is stopped. This
will cause the motor to act like a generator, resulting
in voltage on the pump.
