Grundfos CM series, Service Instructions Manual

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5.2.2 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 as-
sembly.
1. Fit O-ring (pos. 102) on the stationary shaft seal part. See the
figure below. For correct lubricant, see the section on tightening
torques and lubricants.
TM044322
Fitting the O-ring on the stationary shaft seal part
2. Press the stationary shaft seal part home.
Do not touch the seal face.
TM044436
Fitting the stationary shaft seal part (only SiC/SiC)
3. Fit the rotating shaft seal part (pos. 104) so that the seal face
touches the stationary part.
Do not touch the seal face.
4. Fit O-ring (pos. 107) into the rotating shaft seal part (pos. 104).
For correct lubricant, see the section on tightening torques and
lubricants.
5. Fit retainer (pos. 111) and stop ring (pos. 111a).
TM044325
Fitting the stop ring
6. Fit spring (pos. 108) and driver (pos. 112).
TM044326
Fitting the spring and driver
7. Fit impeller (pos. 49), spacing pipe (pos. 64), gasket (pos. 139b)
and chamber plate (pos. 4f).
8. Continue the assembly until chamber for bearing (pos. 4a).
Step 8 applies only to pumps with eight stages.
9. Fit chamber for bearing (pos. 4a), short spacing pipe (pos. 64a),
gasket (pos. 139b) and bearing ring (pos. 47a). See the section
on order of assembly for chambers and impellers.
Step 9 applies only to pumps with eight stages.
10. Fit impeller (pos. 49), 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 chamber (pos. 4e) and gasket (pos. 139b).
13. Fit inlet part (pos. 6).
14. Fit and cross-tighten staybolts (pos. 26). See the section on
tightening torques and lubricants.
Related information
3. Tightening torques and lubricants
5.6.2 Assembly
5.7.2 Assembly
8.1 Key for CM 1, 3, 5
11
English (GB)