Grundfos CR Series Service Instructions

English (GB)
14
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). Below procedure
covers the renewal of neck rings in chambers as well as in 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 fig. 29.
Fig. 29 Service tool L for installing the neck ring
2. Place service tool L in a vice. See fig. 30.
Fig. 30 Service tool L placed in a vice
3. Place the neck-ring retainer (65) on top of the disc with the
driving dogs upwards. See fig. 31.
Fig. 31 Neck-ring retainer (65) placed in service tool with the
tabs pointing upwards
4. Place the neck ring (45) on top of the neck-ring retainer (65).
Note: The text "UP" which is stamped into the neck ring (45)
must point down towards the neck ring (65). See fig. 32.
Fig. 32 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. 33 and 34.
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. 33 and 34.
7. Fit the distance-pipe piece and screw on the top plate of
service tool L. See fig. 33 and 34.
TM07 1781 2218TM07 1782 2218
CR, CRN 95
CR, CRN 125
Screw
Top cover
Distance-pipe piece
Base
CR, CRN 255
CR, CRN 215
CR, CRN 185
CR, CRN 155
TM07 1783 2218TM07 1784 2218

Grundfos CR Series Specifications

General

Brand	Grundfos
Model	CR Series
Category	Water Pump
Language	English