Grundfos CM 3 Service Instructions

English (GB)
12
5.5 CM 10, 15, 25, stainless steel
5.5.1 Dismantling
1. Remove staybolts (pos. 26).
2. Remove clamping flange (pos. 6a) and sleeve (pos. 16).
3. Remove the chamber plate (pos. 4f).
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 spacing pipe (pos. 64e), bearing ring (pos. 47a) and
chamber for bearing (pos. 4a).
8. Continue the dismantling until shaft seal (pos. 105).
9. Remove shaft seal (pos. 105). See fig. 21.
Fig. 21 Exploded view of shaft seal
10.Remove O-ring (pos. 31) and cover plate (pos. 32).
5.5.2 Assembly
1. Fit cover plate (pos. 32) and O-ring (pos. 31). Lubricate the
O-ring. See section 3. Tightening torques and lubricants.
2. Fit O-ring (pos. 102) on the stationary shaft seal part.
See fig. 22. For correct lubricant, see section 3. Tightening
torques and lubricants
Fig. 22 Fitting the O-ring on the stationary shaft seal part
3. Press the stationary shaft seal part home. See fig. 23.
Fig. 23 Fitting the stationary shaft seal part (only SiC/SiC)
4. Fit the rotating shaft seal part (pos. 104) so that the seal face
touches the stationary part.
5. Fit O-ring (pos. 107) into the rotating shaft seal part
(pos. 104). For correct lubricant, see section 3. Tightening
torques and lubricants
6. Fit retainer (pos. 111) and stop ring (pos. 111a). See fig. 24.
Fig. 24 Fitting the stop ring
7. Fit spring (pos. 108) and driver (pos. 112). See fig. 25.
Fig. 25 Fitting the spring and driver
8. Fit short spacing pipe (pos. 64a), chamber with holes (pos. 4d)
and impeller (pos. 49).
9. Continue the assembly until clamp (pos. 64c). For correct
fitting of chambers and impellers, see section 8. Order of
assembly for chambers and impellers.
Note
Step 7 applies only to pumps with six or more
stages.
TM04 4327 1909
Note
Dismantling of MG 71 and MG 80,
see section 5.6.1.
Dismantling of MG 90, MG 100, MG 112 and
MG 132, see section 5.7.1.
Note
It is advisable always to replace wear rings
(pos. 45) and wear ring retainers (pos. 65).
See section 5.8.
Note
Assembly of MG 71 and MG 80, see section 5.6.2.
Assembly of MG 90, MG 100, MG 112 and MG 132,
see section 5.7.2.
TM04 4322 1909
Warning
Do not touch the seal face.
TM04 4435 1909
Warning
Do not touch the seal face.
TM04 4325 1909TM04 4326 1909

Grundfos CM 3 Specifications

General

Maximum operating pressure	10 bar
Pump housing	Stainless steel
Frequency	50 Hz
Housing Material	Stainless steel
Connection Size	1 inch
Approvals	CE
Voltage	230 V