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

Comments for 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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PUMP COMPRESSION ~ IT DOESN'T HAVE ANY OR VERY MUCH COMPRESSION

by TODD BOOHER
(CANTON,GA,USA)

WHEN I SHUT OFF THE COMPRESSOR IT SEEMS THAT WHEN IT'S COMING TO A STOP IT DOESN'T HAVE ANY OR VERY MUCH COMPRESSION. IT SEEMS LIKE RUNS CONSTANTLY AND WONT BUILD MORE THAN 110 PSI. THERE IS ANOTHER COMPRESSOR NEXT TO THIS ONE AND YOU CAN TELL THE DIFFERENCE IN PERFORMANCE BETWEEN THE TWO.

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Bill says...

Not... quite... sure what you mean, Todd.

Why are you shutting off the compressor? Doesn't your pressure switch do that for you when the tank pressure reaches the cut out level?

Or, is the issue that the tank pressure doesn't get to the normal cut out pressure level? I think that's what you mean by "IT SEEMS LIKE RUNS CONSTANTLY AND WONT BUILD MORE THAN 110 PSI."?

OK, if that is the case, on the troubleshooting page is a link to pages on why compressors won't build pressure. Have a look at those pages, and then add a comment here if they don't provide guidance, OK?

Cheers,

Bill



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How do I connect a vacuum line to a Speedaire 2Z269?

I came across a Speedaire 2Z269 which say it is an air compressor/vacuum pump. I see know way to connect a vacuum line to it… anyone know how?

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Dec 09, 2013
2z269
by: Doug in s.d.ca

You sure about that model number?

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Air lines freezing on Speedaire 5Z658E

Is the air filter consumable? I am not the expert here (obviously), but I thought that it worked by binding the water from the compressed air so the air in the lines wouldn't freeze. But my guys are complaining about frozen lines, and I need someone smarter than me to resolve their issue.
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Be good if you had a complete description of where the compressor was, where the air lines are going, and so on.

Typically, air filters remove free water from air lines.

Air going in air lines from a hot and humid environment - like your air compressor tank - outside into a freezing environment contains a lot of water vapor.

When it hits the cold air lines the water vapor turns into water, and freezes.

Lots of information on this site about how to remediate that. Have a read.

Cheers,

Bill

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