Removing The Impeller; Repairing The Impeller - Alamarin Jet COMBI-FRAME AJ 285 Repair Manual

Impeller
Repair manual
3.2. Removing the Impeller
Before removing the impeller, remove the stator (section 6.1.
, page 65).
stator

Removing the impeller:

1. Open the screw keeping the sleeve (figure 37, point D) at the rear end of
the shaft in place and pull the sleeve off the shaft.
2. Remove the shim rings that may be present between the impeller and the
shaft sleeve.
Do not lose the shim rings and be sure to keep them separate from the
ones in front of the impeller! This will make adjusting the impeller easier.
3. Pull back the impeller off of the shaft and remove the key from the keyway.
3.3. Repairing the impeller
Minor damages on the impeller can be repaired. Examples of this are dents
to the front edge that can be ground out, and slightly bent blades that can be
hammered back into their original position.
If the diameter of the impeller becomes too small, the impeller must be
replaced.
The impeller is manufactured from acid-proof steel 1.4460 (AISI329).
Sanding the front edge
If necessary, a worn front edge can be sanded down. Please note that the front
edge may not be too sharp or too round. A suitable rounding is approximately r
= 1 mm (figure 40).
KM/285/EN/1.1.0
NOTE!
The impeller must be balanced after any repair operations.
Removing the
29