running slow and fast

by ken
(geneva, il. usa)

Compressor starts fine until 50 PSI. then slows down quit a bit and speeds back up, back and forth until cut off at 135 PSI.

Last Winter, the belt broke, and the compressor ran for 2-3 days before i found it.

Oil was just changed and pump runs good. it must be something with the motor.

Just wondering what is going on.

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Bill says...

Hi Ken. Welcome!

The compressor ran for three days until you found what? That the belt was broken? So the motor ran for three days without compressing any air.

Might be a duty cycle issue damaging your motor, but before I took it in to be checked, I think I'd pull the check valve going into the tank and make sure that it's not obstructed in some way.

That's a bit of a reach that it might be the check valve, but that's cheap to check.

Otherwise, I suspect your motor or drive train has a problem.

Cheers & good luck,

Bill

intake valve

by Daniel
(Bristol, TN )

Builds pressure to about 35 pounds then wont build any more and keeps running, but if you turn the unit upside down and kick it, it will fill the rest of the way up and cut off when full.

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Bill says....????

Daniel, you turn your compressor upside down and kick it? Hmmmm?

I take it that its not an oil lubed unit?

Maybe have a look at this page about why compressors won't build pressure.

Cheers,

Bill

Alton AT 01204-6 2-1/2 horse - compressor motor just hums

I have an alton AT 01204-6 2-1/2 horse 6 gallon air compressor. It use to work fine. Now it just hums when plugged in and trips the breaker. What can I try to do? Where can I find a manual on this model?
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You posted this under Pressure Switch Issue, yet I don't think your compressor problem has anything to do with your pressure switch.

I think either your motor start capacitor is pooched, or you've got an "increased load" condition on the motor, and it can't overcome that load to start, draws too many amps, and pops the breaker.

Under troubleshooting there is a page for posting Manuals Wanted.

Cheers,

Bill

UNLOADER VALVE

by BOB
(INDIANA)

I HAVE AIR LEAKING OUT OF UNLOADER VALVE WHEN COMPRESSOR KICKS OFF AIR KEEPS BLEADING OUT OF UNLOADER ON SWITCH TILL MOTOR KICKS BACK ON WHAT CAUSES THIS UST TARTED DOING THIS

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Bill says...

You need to check your check valve. See here.

Cheers,

Bill