my compressor runs for about 30 seconds then won't turn anymore

by robin
(nyc)

A speedaire compressor just came into my life, A friend told me it had something wrong with it but didn't know what when he gave it to me. It's an 80gal vertical 7.5hp 3 phase with a 5f565 compressor on it.

The problem that I'm having is that it runs for a short time, maybe 30 seconds, starts to build up pressure, then slows and locks up.

When I turn it manually it won't go past what seems to be top dead center. I have no idea if it's worth fixing, any advice would be great, thanks

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Bill says...

Robin, the order of things I would check are...

~if oil lubed, the oil level
~ a motor load test
~ the pump cylinder and piston assembly

It could be any number of things that are causing this problem, and I don't have enough info from you to guess more accurately than that.

Good luck.

Bill




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my compressor runs for about 30 seconds then won't turn anymore

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Feb 03, 2011
 more info
by: robin

well, the motor seems fine and the oil level was a little high. I did have to transport it on it's side, but I let it sit a few days before I tried to run it. The weird thing is that when it did run, it sounded fine and no vibrations. Now, I can only turn the compressor about 300 degrees. I can hear a bit of air leaking out of the crankcase when I loosen the fill plug. I feel that it's not the bottom end since it didn't tap when it ran. I could be wrong though. Is there any way it's getting air locked, or that there's still oil in the cylinders?

Thanks Again,
Robin

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When it runs for the 30 seconds, are you getting any pressure increase in the tank?

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