Dewalt D55141 - motor begins to lose power slowly

The compressor works fine upon first turning on, then the motor begins to lose power slowly and gradually. It reaches 75 psi and sounds like it is going to fail completely. If I turn the power switch off and back on, it goes back to full power for a brief time, but quickly begins to bog down again. It has a burning smell when this happens. I've replaced the check valve and power cord, but still has the same problem. Any suggestions?

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The symptoms suggest a power supply problem. You say you replaced the cord, yet is that cord plugged directly into an outlet?

What else is taking power from the same circuit as your compressor when it's running, if anything?

The burning smell you speak of suggests an overloaded and/or underpowered motor. Do check the capacitors too. See that page linked from the site map page.

Cheers,

Bill

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Mar 03, 2012
One more note
by: Anonymous

I noticed that when it begins to do this there is an abrupt change in the way the motor sounds, so I was able to get a peek through one of the side vents, and when it happens there are a massive amount of sparks coming from the inside of the motor housing. Any thoughts? Thanks again for your help!
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Could be the windings... maybe skip to getting the motor checked out first!

B.

Mar 02, 2012
same issue
by: Anonymous

Thanks Bill-
I have the unit plugged directly into an outlet and upgraded the power cord to 16 guage wire. The motor bogs down a significant amount, very abruptly, around 100 psi. It almost seems like the motor is giving up on the amount of work it's having to put out to get the tank over a certain amount of pressure. Could this have anything to do with the capacitor or could the motor be slowly failing? Thanks again for any input!
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Right on both counts, if there is not a mechanical issue involved. The next check then is the capacitor. See the page on that for info. If the caps are good, then it's time to consider a motor load test.


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Dewalt D55168 200 PSI 1.6HP

by Steve Miller
(Richmond VA)

Dewalt D55168 200 PSI 1.6HP

On start up it builds to 210 PSI

While running the compressor kicks back in when presure drops to 180PSI but my problem is it continues to drop in presure all the way down to 50PSI enven though its still running.

Took it to the DeWalt service center and they say it works fine.
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Steve, the question I have is what air tool are you using to force the air pressure in the tank to continue dropping despite the compressor running?

A 1.6 HP air compressor has limited output. If your air tool is pulling more air than the compressor can generate, the tank pressure will continue to drop past the compressor cut in point, the compressor will start trying to rebuild the air pressure but cannot, as you are using more air than it can generate.

Based on the info you provided, that's my guess as to what's happening. Update me in a comment here if I've misunderstood, will you?

Cheers,

Bill

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