Grundfos CM series, Service Instructions Manual

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5.3.2 Assembly
Assembly of MG 71 and MG 80, see the section on as-
sembly. Assembly of MG 90 and MG 100, see the section
on assembly.
1. Fit cover plate (pos. 32) and O-ring (pos. 31). Lubricate the O-
ring. See the section on tightening torques and lubricants.
2. Fit O-ring (pos. 102) on the stationary shaft seal part. See the
section on tightening torques and lubricants.
TM044322
Fitting the O-ring on the stationary shaft seal part
3. Press the stationary shaft seal part home.
Do not touch the seal face.
TM044435
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.
Do not touch the seal face.
5. Fit O-ring (pos. 107) into the rotating shaft seal part (pos.
104). See the section on tightening torques and lubricants.
6. Fit retainer (pos. 111) and stop ring (pos. 111a).
TM044325
Fitting the stop ring
7. Fit spring (pos. 108) and driver (pos. 112).
TM044326
Fitting the spring and driver
8. Fit impeller (pos. 49), chamber with holes (pos. 4d) and spacing
pipe (pos. 64).
9. Fit impeller (pos. 49), chamber (pos. 4) and spacing pipe (pos.
64).
10. Fit impeller (pos. 49), chamber (pos. 4a), short spacing pipe
(pos. 64a) and bearing ring (pos. 47a). See the section on order
of assembly for chambers and impellers.
Step 10 applies only to pumps with eight or more
stages.
11. Fit impeller (pos. 49), clamp (pos. 64c), washers (pos. 66) and
nut (pos. 67).
TM021057
Correct fitting of washers
12. Hold clamp (pos. 64c), and tighten nut (pos. 67). See the
section on tightening torques and lubricants.
13. Fit chamber (pos. 4e), sleeve (pos. 16) and clamping flange
(pos. 6a).
Do not forget to fit the last chamber (pos. 4e), as it is
possible to assemble the pump without the last cham-
ber.
14. Make sure the holes on the chamber with holes (pos. 4d) are
facing the same direction as the outlet port of the sleeve (pos.
16) and the outlet port is positioned in the middle between the
holes. In the case of 3 and 9 o’clock variants, this rule must be
followed as well.
A = A
TM075504
Correct positioning of the chamber with holes (pos. 4d) and the
outlet port of the sleeve (pos. 16)
15. Fit and cross-tighten staybolts (pos. 26).
Related information
3. Tightening torques and lubricants
5.6.2 Assembly
5.7.2 Assembly
8.1 Key for CM 1, 3, 5
13
English (GB)