compressor will not restart unless tank depressurize

by tim fitzgerald
(elgin ok)

compressor will not restart unless tank depressurize.

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If the air compressor will not restart when there is pressure in the tank, that suggests that there is too much load for the motor, and the compressor will typically hum or blow breakers.

The most common cause is that the unloader hasn't dumped air over the piston(s) the last time the compressor reached cut out and stopped.

Check the unloader valve operation, and if that isn't the problem, post a comment here telling me what you found. Also, see the troubleshooting section on the sitemap page for more info.

Cheers,

Bill

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Won't start

by Kenny
(Livermore,ca,usa)

I have a 120v portable Caulfield 100psi air compressor that will not start. All connections are good no sign of rust.
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Kenny, is the compressor a Campbell Hausfeld? What is the model number?

When you say it won't start, what is or is not happening? Is there air in the tank? If so, what pressure is it? Is there power to the compressor?

Please give me more information to try and help.

Cheers,

Bill

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Jul 03, 2013
compressor not starting
by: Jarrett

Hi there I have a Husky 20 gal oil free upright that will not start. I was using it and it stopped running and now it will not start. I checked electrical connections, the switch, and the fuse. I know it is not the outlet. When i turn it on I do not here a humming noise nor did I smell a motor burning and I know what that smells like. Could it be the start motor capacitor? Thanks for the help.
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With the tank empty, plug in the compressor. Turn it on if there is a start switch. Use a multi-meter to check and see if power is flowing from the pressure switch to the motor circuit.

If power is not flowing the problem may be the pressure switch.

If power is flowing from the switch to the motor, and you hear nothing when you switch the power off an on, then you do want to check the start cap to see if it has shorted out.

See the page on this site about checking caps.

B.

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brute model 074004 air compressor shut off

by arnold
(riverside, ca)

I was using my air compressor, a brute model 074004, and out of nowhere it just turned off. this is my first air compressor I have owned and don't know much about them. I tried to disconnect it and restart it, but it still didn't work. I tried to release all the air and turn it on, but that didn't work either. Any ideas as to what it can be?


Thanks, Arnold.
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Arnold, I'm sure you've checked to be sure that you have power to the socket into which you have plugged your air compressor?

If you are using a power bar or extension cord, that isn't good for compressor motors. Always plug the compressor directly into a socket, preferably one that is not being used by other appliances.

If that makes no change, then you need to determine if power is actually getting past the pressure switch to the motor circuit. That means using a multi-meter to check voltage before and after the switch. Do this with the tank empty, to be sure that the pressure switch has tripped to "passing".

If power is flowing to the motor circuit, then that says the pressure switch is OK, and the next likely culprit will be the compressor motor start capacitor.

Bill


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Apr 23, 2013
Part find help
by: Anonymous

I had it plugged in straight to the outlet with no extension or power bar. I tried using a different plug and still nothing. But I will check it out with a multi meter and see what happens. By any chance, could u describe where I need to check? I'm not familiar with compressors.
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You want to check the hot wires going into the pressure switch to be sure power is getting there, and then, check the power on the motor side of the points in the pressure switch to be sure that power is flowing out of the switch to the motor.

Removing the cover from the pressure switch will allow you access to the wires.

Be careful!

Bill

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240 volt 1hp air compressor

by Gary
(Portland, Oregon)

My single phase 1hp 240 air compressor will not start on its own, I have to roll the pulley to get the motor started. Any ideas?
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Rather than re-type all the info that's on the page, Gary, see the troubleshooting section on the sitemap page, follow the link to the page with info, and check out the compressor based on what you read.

It would also help to know the make and model of the air compressor, so that others that may have the same one can chime in.

Cheers,

Bill

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