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Pump motor postmortem
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calzap:
Thanks for all the replies and the link to a motor supplier.   I've asked for advice on a shaft coupler as a separate topic.  Here's the link:  https://www.eevblog.com/forum/repair/(b)advice-wanted-on-motor-shaft-coupler(b)/msg2858712/#msg2858712

Mike in California
DBecker:
It's not likely that you'll be able to diagnose the failure with a melted fan, but pressed-on nylon parts have a failure mode where the hub splits from long-term stress.  Humidity changes increase the stress.  A spring steel collar around the hub mitigates the problem.
james_s:
I've seen similar fans come loose before. I used to have a dishwasher with a metal fan pressed on the motor shaft that came loose, the motor was spot welded together and the fan was inside the shell so all I could do is dribble some glue on it now and then and it would last a while.

As far as big motors go, I've been impressed by Baldor but there are doubtless many other good quality motors to choose from.
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