motor doesn't run

by Andy
(Vermont)

Image of capacitor leads

Image of capacitor leads

while filling tires, the compressor started...s l o w l y...and then quit. Since then I have been unable to elicit any response whatsoever out of the unit? The oil level has always been fine?

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As a comment here, tell me how long your extension cord is, what the breaker size is for the circuit feeding your compressor, and how many other items are pulling power from the same circuit.

Or, Andy, if you are not using an extension cord, check out the page in troubelshooting about capacitors. Your start cap may have pooched.

Bill

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Jul 08, 2015
Reset button 40400
by: Bill

Thanks Brendon. I have added your information to the Central Pneumatic / Harbor Freight air compressor tips page.

Jul 06, 2015
Reset Button did the trick
by: Brendon Holt

My Compressor has been working flawlessly for some time. Albeit I use it less then my Stationary and bigger Compressor. Thanks to the site, the reset button did the trick. For those who are wondering the Reset Button is hidden under the Shroud (Large Plastic Cover) The wires come into a Reset Switch. To get to it you need to Remove 4 Phillips Head Screws, Two on Top, and Two on the bottom. Looking from the front it is on the Left Hand Side (Label Side). Thanks all for your forum on this matter. I agree that something else like a Cap could have caused this, keeping a eye out. If it happens more, I will actually move the Reset Switch to come through the Plastic Shroud, but hopefully it is a fluke.

Apr 24, 2014
TADAAAAA Fixed
by: Andy

Bill,

Thanks for your input. In regards to your questions, the extension is a heavy duty 50', with 20 amp input, and nothing else on the circuit.

After looking at the various posts, I decided to 'dig' a little further and took the plastic cover off and 'found' a reset button...other than the clearly visible 'Red Button' not under the plastic.
I reset it and TADAAAA the thing lit up. Thank you for your help!
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Not much help, but some, I hope.

A reset button trips because something has gone awry. If it happens again, I'd still check out the caps.

B.

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40400 problems on auto cut-off

Central Pneumatic compressor model 40400

Central Pneumatic compressor model 40400

The compressor runs and builds pressure just fine. The problem is that it will not shut off at the automatic point and just keeps running. I have to manually shut the compressor down when it reaches the red zone or where it should stops.
It ran for several years and just stopped last year with the automatic stop point.
Any suggestions?
Thanks, Tom O'Leary
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Yep, from the sounds of it Tom, your pressure switch may be pooched, as that's what's supposed to cut power to the compressor motor when the cut out pressure is reached.

If you are handy and careful, and have a multi-meter, remove the cover of the pressure switch, drop the tank pressure so the compressor starts, and monitor the switch. When the normal cut out is reached, the power on the motor side of the switch should be gone. If the multi-meter shows power there after the cut out pressure, then the switch hasn't shut the power off, and you will need a new switch. See the bottom of the nav bars for links to pressure switches.

Cheers,

Bill

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Central Pneumatic model 40400 reed valve broken

by Jeff
(Denver)

Central Pneumatic model 40400 reed valve

Central Pneumatic model 40400 reed valve

Central Pneumatic model 40400, 8gallon, 2 hp is not maintaining pressure.

The reed valve, maybe called a strip valve, is broken.
*Harbor Freight does not have one...discontinued
*Mastertoolrepair.com does not have one...discontinued.

Does anyone know how to find one? Thanks.

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Dec 10, 2013
Doug - Reed
by: Jeff

Thanks Doug. I don't know how to find that post on this site. Can you help direct me to that "I made my own reed" post.

Thanks Jeff
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Essentially, they used the old reed valve as a template, and used a paint scraper blade as the material for the new. Some issues with cutting and grinding, but if you are handy, it can be done. The commenter said that the modification worked just fine.

Read the Sitemap page. It's linked from there.

B.

Dec 07, 2013
reed
by: Doug in s.d.ca

As sculptors say, it's hidden in the raw material.

Check out the "I made my own reed valve" post.

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40400 compressor hums but wont start

by g.bernard
(florida)

when i turn the power on, i hear a hum for a few seconds then it trips the reset circuit
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Well G. Barnard, the humming noise is the compressor trying to start but for some reason it cannot.

Things that affect this are the power supply itself, the start capacitor, maybe the motor centrifugal switch failing (if this motor has one) among other things.

Most of these are written about on this site. See the troubleshooting section on the sitemap page for links to the appropriate pages.

Cheers,

Bill

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