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Start by adjusting the feedback linkage. Once the lift stops on its own at top without deadheading the pump address any remaining issues. Dan

Those look like some sort of torque to yield bolts. So only one of them will not tighten? Dan

There are a multitude of advantages to 3 phase induction motors. Ask Google for a list. But the biggy is single phase motors top out around 5-7 HP and even at that relatively small size require "massive' input current draws. Take a look at the big green mill in my earlier post. It has 4...

It depends on the converter. I say they suck because with most low cost units you only get 2/3 the rated motor HP and the motors run hot when loaded. The cheap units are simply motor starters and you are actually running the motor on just two of the three legs. Not at all good for the motor...

You would be shocked at the cost of that service.

No internet myth. Here are some experts explaining why. Pay close attention to Forrest Addy who is an expert of experts. https://www.practicalmachinist.com/forum/threads/vfd-derating-and-the-math.102222/ You will find that same info straight from the OEM sites...

BTW - your understanding of C is waaaay off the mark.

When used as a phase converter most VFDs have to be derated by at least 25% and 50% is safer. Dan

A simple VFD if you only need to power one machine with one motor. Knowing your situatiin I would strongly recconend a DIY rotary phase converter. Cheap, easy to build and capable of powerung multipke machines and motors. This is 20 years ago when it was first built for the "new" Cincinatti...

Static phase converters suck. A simple VFD works we if you only need to power one machine with one motor. I dont see that in your future. Knowing your situation I would strongly recommend a DIY rotary phase converter. Cheap, easy to build, provides near POCO quality 3 phase, and capable of...

Have you never tightened a bolt?

I sm talking about whatever does not tighten.

Why wont they tighten?

Whatever - check the internal threads. Dan

If you cant pull up 23 lb-ft there is ZERO chance of snapping a bolt. Check the internal threads in the crankcase. I suspect they have pulled out. Dan

Messicks says shaft and complete spindles are available. Dan

I would be would be more worried about the threads in the crankcase. Whatever it is it doesnt sound right. Dan

Thus isnt that complucated. If yiu have the cylunder in hand you can dump the oil out. Dan

Or just leave it sitting with open ports down for 20-30 minutes .... Dan

That would rule out the seals. Check and verify adjustment of the feedback linkage. I assume "bouncing" means the height oscillates up snd down. Dan