Compressor will not shut off

by Kevin
(Tyler ,TX)

I have a central pneumatic oil-less compressor(3gal oil-less) compressor that builds to 40PS but won't shut off also at what psi is it supposed to shut off?


If yours is the "3 gal. 1/3 HP 100 PSI Oilless Pancake Air Compressor " then the normal cut out will be 100 PSI.

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Oct 07, 2016
Compressor will not shut off
by: Bill

Kevin, the troubleshooting pages about air compressors that run but don't build pressure will provide information about the things you need to check.

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harbor freight 21 gallon compressor runs constantly

by Konner
(Iowa)

I have a harbor freight 21 gallon compressor and I accidentally popped of the pressure switch.

I thought I got it back together correctly but now the compressor lever to turn it from AUTO to OFF does nothing and the compressor runs no matter what the lever is on.

The pressure switch brand is Lefoo.
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Lefoo is a common brand of pressure switch.

If, as I understand it, you somehow disassembled the pressure switch and you cannot reassembled it (no shame there, I couldn't either), you can get an exact replacement many places on line.

When the compressor is running, does the tank pressure continue to rise to the point that the PRV releases? That being the case, get the pressure switch changed sooner rather than later, as your air compressor is in a dangerous configuration.

Comment here with any more info.

Cheers,

Bill

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Nov 29, 2015
What pressure switch
by: Bill

Find your compressor model number, and then Google pressure switch for that model number and you will usually find sources. Since I'm not sure your model number, I cannot recommend a particular one.

Nov 29, 2015
Did same thing.....help!
by: Allen

Can you tell me where u got the new switch please?!

May 07, 2014
Response
by: Konner

Yes, you are correct. I accidentally disassembled it and apparently I didn't get it back together right. I let it run until about 140psi then shut it off because it is supposed to shut off at 125psi. Thanks for the help.
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You are welcome. For safety's sake, get a new switch on the compressor sooner rather than later, will you?

B.

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Compressor does not shut off when reaching it's max.

by frank pinto
(lodi, new jersey , usa)

When i run the compressor it keeps running and dose not shut down when it reaches the max pressure.

I used this machine three times and harbor freight has no idea how to help me with this problem.

If its in the pressure valve where can i get a new one and explanation how to install it.

I have the central pneumatic six gallon pan cake.

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Jan 07, 2017
Will not shut off
by: Bill

What is the normal cut out pressure of your compressor, Frank?

What pressure will the tank get to if that pressure bypasses that normal cut out pressure setting?

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