This is a pressure lubricated pump and that is why this compressor is still around.
I had a 10 HP Reliance motor that I installed (it was new in box). The old pulley had a 1.25" bore in the bushing, the Reliance has a 1 3/8" shaft, so I had to bore the pulley bushing.
At the moment, it seems to run and pump air. It is also rather quiet. Presently, I am reusing the pulley off the 7.5 HP motor, and installed a new regulator from 120-145 PSI, so I am not using the full power of it.
I also have a couple of minor problems that I want to look at more closely.
One is that the motor vibrates a lot. I am not yet sure why. One possibility is that I did not bore the bushing properly on-center (did this on a lathe, though), and another is that the belts are old and lost some flexibility. Visually, one belt out of three (the middle one) seems to be "flying up and down" as it rotates, I would expect it to be steadier.
The good test from it would be to disconnect belts, and run the motor with pulley but without belts, and see if vibration continues. If it does, I will know that I did a bad boring job, and will simply buy a new two piece pulley from McMaster.
Another problem is that there is some air leak somewhere in the area where the pressurized air leaves the pump and enters the aftercooler. I am not yet sure where it is. It is minor, but I should have none.
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