Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 108)

108 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Figure 89 - Cutaway View of Fan Impeller and Bushing
1. Record the distance from the end of the motor shaft to the bushing. The
new impeller must be installed in the same location. Failure to do so will
result in gaps between the impeller and the intake ring resulting in loss of
air flow, or rubbing of the impeller against the inlet ring or motor assembly
during operation.
2. Remove both cap screws from the bushing. The impeller or bushing may
fall as screws are loosened.
3. Thread the cap screws by hand into the two threaded holes in the bushing
flange.
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.
A
B
C D E
A – Taper surfaces
B – Capscrews
C – Split in Taper Bushing
D – Key
E – Threaded Hole for Separating Tapers
DO NOT LUBRICATE
CAPSCREWS, BORE,
OR BUSHING BARREL
ATTENTION: Do not lubricate capscrews, bore, or bushing barrel, as this will
hinder clamping force of the bushing on the shaft and impeller bore.