Model #40400 Running in bursts, then overload switch tripping

by Ed Eskew
(Medfield, MA)

I bought a Central Pneumatic #40400 two years ago, used it for a little while, then put it away and just began using it again.


When I run it, the motor runs in little bursts of fast and slow, with a sound of air rushing while the motor is running slowly.

After a couple seconds of this, the overload switch trips and the whole thing shuts down.

I had just changed the oil before I put the compressor away, and there is nothing visibly wrong. Is there something I can do to fix this, or someplace I can take it to be fixed?

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Bill says...

Ed, my first thought is that the air compressor is being underpowered.

Are you using an extension cord? If so, try plugging it into a socket directly.

Is the plug that the air compressor is connected to powering other electrical appliances at the same time? If so, isolate the plug for the compressor to ensure it is getting full power.

Did this make any change? Please post a comment here.

Cheers,

Bill

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Jan 14, 2012
I wish that was the problem
by: Ed Eskew

Unfortunately it wasn't plugged in through an extension cord, and there wasn't anything else in the outlet. I did try some other outlets around my house, but had no success.

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Broke my compressor - 40400

Broken Part

Broken Part

I was trying to tighten a part on my compressor, and ended up breaking it. I am not sure what it is called, but am attaching a picture of a similar item. Anyone know if I can get a replacement? Thank you.

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I see the line from the pump head coming into a fitting / check valve, and then the line goes over to the pressure switch.

If the check valve is the problem, you can use any check valve that fits the port and actually works in preventing back flow of compressed air.
Make sure you empty the air before you remove the existing lines.

Also make sure that the check valve is protecting the air in the tank, which means that it is downstream from the pump line.

Cheers,

Bill

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90 elbow broke

90 elbow theat comes from the head that the cooper lines connects to what size is it.
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I can't be sure as I don't have the manual or this model of air compressor. I think it might be 1/2 NPT.

Can you remove the broken fitting? If so, see the fittings page on this site for information about what the NPT sizes are in inches to help you determine what size the elbow is that threaded into the pump.

If the line down to the tank is metal, you can use a brass elbow fitting with a ferrule available from a good quality plumbing store. Take the old fitting and the pipe with you to the store to ensure you get the right size.

Bill

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Need a replacement Shroud for a Central Pneumatic Model 40400

by Catherine Place
(Douglas, Arizona)

Need part #34 Shroud for a Central Pneumatic Model 40400 gas powered air compressor, 2 HP, 8 gallon.

Please respond to barzbar@msn.com

Thanks!

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Aug 03, 2016
Parts for 40400
by: Bill

Doesn't seem to be much in the way of OEM parts available for this compressor.

I did find a bunch of used CP 40400's on line, however, and if there is one near you, and you can get it cheap, consider buying a spare for parts.

Aug 01, 2016
help!
by: Donald Harvey

The shroud on my unit broke, and it is really loud. I can not locate a source for purchasing the shroud for this model.

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