I tried searching the forum and didn't see anything identical, so I thought I would post a new thread.
My old Pentair Whisperflo 2HP died (turned on and only hummed), so I replaced the motor, shaft seal and impeller. Now, when I start it up, it has a squeal / grind noise. It's not terribly loud and will vary slightly, but continues. I don't have a lot of experience, but it feels like some kind of grinding rather than bearings, but i suppose it could be the bearings even though it is a new motor... my question is really, what else could it be?
Some other details...
The model number of the new pump is different because the one I had is no longer sold. It seems to be identical where it counts and fits well.
The shaft seal instructions said to use silicone sealant on the metal portion of the shaft seal which I did not do.
The diffuser had some plastic shavings built up near the shaft hole, which I scraped away. It seemed well in tact.
I ran the pump for about 10 seconds without it having been primed. It didn't really make any noise before I noticed, turned it off, and primed it.
Thanks in advance for any help.