Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 121)

Rockwell Automation Publication 7000-UM202B-EN-P - June 2014 121
Component Definition and Maintenance Chapter 3
4. Tighten each bolt part of a turn successively, to push the impeller off the
bushing. Screwing down the cap screws into these holes will force the
bushing away from the impeller hub, releasing the compression on the
shaft. Be careful that the impeller does not fall as the clamping force is
released.
5. Pull the bushing off the shaft and remove the impeller. If the assembly has
been in place for some time, it may be necessary to use a wheel puller to
remove the bushing. Never use a wheel puller on the impeller.
Installing Impeller Assembly onto Motor Shaft
The bushing barrel and the bore of the impeller are tapered which assures
concentric mounting and keeps the impeller running evenly.
The cap screws, when tightened, lock the bushing in the impeller and over the
motor shaft.
The bushing is split down the middle, so that when the locking cap screws force
the bushing into the tapered bore in the impeller assembly, the bushing will grip
the shaft with a positive clamping fit.
The impeller and bushing assembly have keyways that line up with the shaft and
are held in place with compression.
To assemble:
1. Ensure the shaft and keyway are clean and smooth. Clean the shaft and
bore with rubbing alcohol or non oily solvent. Check the key size with
both the shaft and bushing keyways.
2. Put the cap screws through the clearance holes in the bushing and put the
bushing loosely into the impeller, lining up the screws with the threaded
holes on the impeller hub. Do not press, drive or hammer the bushing into
the bore.
3. Start the cap screws by hand, turning them just enough to engage the
threads. Do not use a wrench at this time. The bushing should be loose
enough in the impeller to move freely.
4. Slide the impeller and bushing assembly onto the motor shaft, ensuring the
same distance from the end of the shaft to the bushing as in step 1 of
impeller removal.
5. Fit the key into keyway. Do not force impeller and bushing onto shaft. If
they do not fit easily, check the shaft, bushing and key sizes.
ATTENTION: Do not lubricate capscrews, bore, or bushing barrel, as this will
hinder clamping force of the bushing on the shaft and the impeller bore.