Grundfos CM series Service Instructions

5.3 CM 1, 3, 5, stainless steel
5.3.1 Dismantling
1. Remove staybolts (pos. 26).
2. Remove clamping flange (pos. 6a) and sleeve (pos. 16).
3. Remove chamber (pos. 4e).
4. Hold clamp (pos. 64c), and remove nut (pos. 67).
5. Remove lock washers (pos. 66) and clamp (pos. 64c).
6. Remove impeller (pos. 49).
7. Remove bearing ring (pos. 47a) and short spacing pipe (pos.
64a).
Step 7 applies only to pumps with eight or more
stages.
8. Remove chamber for bearing (pos. 4a), impeller (pos. 49) and
spacing pipe (pos. 64).
Step 8 applies only to pumps with eight or more
stages.
9. Continue the dismantling until shaft seal (pos. 105).
10. Remove shaft seal (pos. 105).
TM044327
Exploded view of shaft seal
11. Remove O-ring (pos. 31) and cover plate (pos. 32).
Dismantling of MG 71 and MG 80, see the section on dis-
mantling.
Dismantling of MG 90 and MG 100, see the section on
dismantling.
It is advisable always to replace wear rings (pos. 45) and
wear ring retainers (pos. 65). See the section on checking
and replacing impellers and chambers.
Related information
5.6.1 Dismantling
5.7.1 Dismantling
5.8 Checking and replacing impellers and chambers
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English (GB)

Grundfos CM series Specifications

General

Enclosure Class	IP55
Impeller Material	Stainless steel
Type	Centrifugal
Material	Cast iron or stainless steel (various grades depending on model)
Motor range	0.37 kW to 4 kW (depending on model)
Applications	Water supply, Industrial processes
Maximum Operating Pressure	10 bar
Installation	Horizontal or Vertical
Stages	Multi-stage
Motor Power	0.37 kW to 4 kW (depending on model)
Speed	2900 rpm
Power supply	1 x 220-240 V, 50/60 Hz or 3 x 220-240/380-415 V, 50/60 Hz (depending on model)