Grundfos CR 32 Service Instructions Manual page 5

6.3 Chamber stack
6.3.1 Fitting chamber stack on the holder
1. Place the holder for dismantling and assembly in a vice and
tighten it. See fig. 2 for right positioning.
2. Pull the chamber stack out of the outer sleeves (pos. 55) and
place it in the holder according to fig. 2. Make sure the
chamber stack engages with the holder.
3. Fit the locking pin in the hole marked "Dismantling".
Fig. 2 Positioning the chamber stack in the holder
4. Remove screws (pos. 26b) and washers (pos. 26c).
5. Remove straps (pos. 26a).
6.3.2 Dismantling chambers
Depending on their construction, dismantle the chambers
according to the instructions below. The symbols refer to section
10. Order of assembly for chambers and impellers.
Single chamber
Fig. 3 Single chamber
1. Pull apart the rotating spring of the bearing (pos. 47a) and
remove the bearing.
2. Hold impeller (pos. 49) with the hook spanner, and slacken
split cone nut (pos. 48) using the key for split cone nut. Turn
the key around and knock the nut to loosen the impeller from
the split cone (pos. 49b).
3. Pull the split cone nut, split cone and impeller off the shaft.
Top chamber and chamber without bearing
Fig. 4 Left: top chamber; right: chamber without bearing
1. Loosen chamber (pos. 3) from the chamber below using a
screwdriver, and remove it.
2. Hold impeller (pos. 49) with the hook spanner, and slacken
split cone nut (pos. 48) using the key for split cone nut.
Turn the key around, and knock the nut to loosen the impeller
from split cone (pos. 49b).
3. Pull the split cone nut, split cone and impeller off the shaft.
Chamber with bearing
Fig. 5 Chamber with bearing
1. Loosen chamber (pos. 4a) from the chamber below or inlet
part (pos.44) using a screwdriver.
2. Loosen bearing ring (pos. 47a) from split cone nut (pos. 48)
and pull it off the shaft.
3. Hold impeller (pos. 49) with the hook spanner, and slacken
split cone nut (pos. 48) using the key for split cone nut.
Turn the key around, and knock the nut to loosen the impeller
from split cone (pos. 49b).
4. Pull the split cone nut, split cone and impeller off the shaft.
5. When the last impeller has been removed, inlet part (pos. 44)
can be lifted off the holder.
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