Fix the original problem before you burn up the motor. The vibration is
caused by the motor fighting itself. You stated you have end play. Have you
fixed it? If you have a start switch, please disassemble the motor and check
it out. It will only take an hour. Then and ony then will you have
confidence of the motor internally.
Steve

"Ignoramus20633" wrote in message
...
Moved it into the garage since it is now on casters.

I added a pressure gauge and pumped the tank to 21 PSI. (just trying
to stay safe). I will see how it will look in the morning. I went
around the compressor and did not hear any hissing or bubbling noises.

The drain was open, I had to close it, which I consider to be a good
sign.

But here's something else. From just a few minutes of running, the
motor got rather hot, despite having a proper fan installed in the
back and the rear fan guard.

I measured the AC current going to the motor. The current was 33
amp. The motor is rated at 25 amp.

If the heat losses are R*I^2, then the motor was producing (33/25)^2 =
1.74 times the heat that it was designed for, and turned more slowly
so it could not move as much air as it was designed to. That's why it
got so hot.

This leads me to believe that Wayne was right (as usual) and this is a
7.5 HP pump and not a 5 HP pump. It definitely needs a 7.5 HP motor,
or a slow 5 HP motor.

So, while nothing is really wrong with the components that were put
together by some previous owner, the "stuff" does not fit together
correctly. It was very fortunate that that guy could not finish the
wiring job and did not burn the motor out trying to run this pump.

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