Renewing Chamber Wear Parts; Neck Ring (45) - Grundfos CR 95 Service Instructions Manual

9. Fit the bottom chamber with bearing (4a), and press it home on
the inlet part (44).
10. Continue installing the remaining chambers (4), split-cone nuts
(48), split cones (49b), impellers (49 or 49a) and bearings (47a).
11. Fit the outlet part (44a) on the top chamber.
12. Fit the strap (26a), washers (26c) and screws (26b). Lubricate
and tighten the screws.
13. Carefully lift the chamber stack with approved lifting equipment.
14. Follow the assembly instructions described in the section on
shaft seal, motor stool, pump head cover, sleeve and chamber
stack assembly.
Related information
3.2.3 Assembly
7.1 Torques
7.2 Lubricants
7.3.1 Special tools
7.4 Order of assembly for chambers and impellers
16

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). See the sections on
dismantling and assembly for the renewal of neck rings in chambers
as well as in the 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 the figure below.
Make sure that service tool L and the neck rings are
completely clean during assembly. If particles are
present between the tool and the pump parts, it may
result in the neck rings being installed wrongly.
2
Service tool Lfor installing the neck ring
Pos. Description
1 Distance piece
2 Screw
3 Top cover
4 Base
2. Place service tool L in a vice. See the figure below.
Service tool Lplaced in a vice
1
3
CR,CRN 255
CR,CRN 215
CR,CRN 185
CR,CRN 155
CR,CRN 125
CR,CRN 95
4