Grundfos CM series, Service Instructions Manual

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5.5.2 Assembly
Assembly of MG 71 and MG 80, see the section on as-
sembly.
Assembly of MG 90, MG 100, MG 112 and MG 132, 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. For
correct lubricant, 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).
For correct lubricant, 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 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 the section on order of
assembly for chambers and impellers.
10. Fit clamp (pos. 64c), washers (pos. 66) and nut (pos. 67).
TM021057
Correct fitting of washers
11. Hold clamp (pos. 64c), and tighten nut (pos. 67). See the
section on tightening torques and lubricants.
12. Fit the chamber plate (pos. 4f).
Do not forget to fit the chamber plate (pos. 4f), as it is
possible to assemble the pump without the last cham-
ber.
13. Fit sleeve (pos. 16) and clamping flange (pos. 6a).
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
TM075503
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
16
English (GB)