Thanks @Sniper and @Scorpio64.
Bearings seemed OK, and the startup cap looked mechanically sound. It's about a 2" sealed type, not a wet electrolytic.
My curiosity is simply aimed at determining if I should have tried to replace the startup cap first (which would have been easy) before installing a new pump. Any other reason for the pump to fail would be (in my book after 28 years) cause to replace it. $335 for the new version that's three speeds, not fixed like the old one.
Curiously, so far, I seem to be getting about two degrees more heat out of the heat pump with the new Grundfos. I won't be sure about that for a while, but I'm going to monitor it. Since the new pump has three speeds I'll have to experiment to see if there's any significant difference in efficiency.
Anyone talk to Mike recently? He's been mia on emails and his phone goes right to voicemail for weeks. I tried reaching him on an item I have there but to also do some other work. Hoping he's ok, not even worried about the item I have there but just odd overall. Hope everything is ok with him??
could be any number of common problems. Caps that have gone bad typically bulge, discolor, and sometimes leak. A winding could have an open circuit, or it may be that the motor is old and the brushes finally gave way.