Grundfos CR 32 Service Instructions Manual page 7

8.1.2 Assembly
1. Place neck ring (pos. 45) in cup (pos. 46).
2. Fit neck ring retainer (pos. 65) with the four driving dogs
pointing downwards. Turn the neck ring retainer until it
engages with the neck ring.
3. Knock/press the neck ring retainer home against the cup
using the punch for complete neck ring. Check that the
measurement is within the tolerance range. See fig.10.
X
X
Fig. 10 Measure distance between retainer and top of cup
Pump Nominal height, X [in. (mm)]
CR, CRN 32 0.40" (10.1 mm)
CR, CRN 45 0.61" (15.5 mm)
CR, CRN 64 0.45" (11.5 mm)
CR, CRN 90 0.48" (12.1 mm)
It should be possible to move the neck ring freely
Note
Note
(sideways) between the neck ring retainer and
the cup.
4. Fit the complete neck ring in chamber (pos. 4/4a) or inlet part
(pos. 44) and knock/press it home using the punch for
complete neck ring.
8.2 Wear ring (pos. 49c)
8.2.1 Dismantling
1. Fit the holder on the impeller. The wear ring should come out
in the center of the holder. See fig 11.
2. Place the impeller and holder on a flat surface, the wear ring
uppermost.
3. Push the wear ring up and free of the impeller using the puller.
See fig. 11.
Fig. 11 Removing wear ring
Tolerance range
8.2.2 Assembly
[in. (mm)]
Press wear ring (pos. 49c) carefully down over impeller skirt
(pos. 49/49a).
± .007" (0.2 mm)
Caution
8.3 Bush (pos. 47c) and retaining ring (pos. 47d)
8.3.1 Dismantling
Place the chamber on a flat surface, and press the bush and
retaining ring down using the punch for bush.
8.3.2 Assembly
Place the chamber on a level and solid surface with complete
neck ring (pos. 45a) facing downwards, and press the bush and
retaining ring home against the chamber using the punch for
bush.
Make sure to push the ring straight down against
the impeller skirt. Make sure not to damage the
impeller.
7