Grundfos CM 1, Service Instructions Manual

Page: 14 / 24

English (GB)
14
5.8 Checking and replacing impellers and chambers
Fig. 29
Correct fitting of wear ring
Check Replace
Impeller Wear ring/wear ring retainer
• Check whether it is necessary to replace the impeller due to
friction between wear ring and impeller skirt. If wear has caused
a noticeable (use a finger nail) groove in the impeller skirt, the
impeller should be replaced.
It is advisable always to replace wear rings (pos. 45) and wear
ring retainers (pos. 65) when the chamber stack is dismantled.
1. Prise the wear ring retainer (pos. 65) up and free of the chamber
using a screwdriver.
2. Remove wear ring (pos. 45).
3. Fit a new wear ring in the chamber. See fig. 29.
4. Press a new wear ring retainer on the wear ring and into the
chamber.
It must be possible to move the wear ring freely (sideways) between
the retainer and the chamber.
Bearing ring
• Check whether there is a visible and noticeable (use a finger
nail) edge on the rotating bearing ring.
• Replace both bearing rings (pos. 47a) and chamber for bearing
(pos. 4a).
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