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Dewalt Pancake Air Compressor won't start

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Forum topic by kmetzger posted 12-16-2021 07:14 PM 735 views 0 times favorited 30 replies Add to Favorites Watch
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kmetzger

221 posts in 3153 days


12-16-2021 07:14 PM

After draining the tank, my air compressor won’t start when I press the “on” switch. The power connection is fine. I can’t find a reset switch. Any ideas? https://www.youtube.com/watch?v=15QFLv5oZbU

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25


30 replies so far

View MSquared's profile

MSquared

1235 posts in 1249 days


#1 posted 12-16-2021 10:27 PM

The Start Capacitor.

Sometimes though, unplug it and clean all the connections with contact cleaner and/or a light scrub.. That may work. But, capacitors for that should be cheap.

-- Marty, Long Island, NY

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kmetzger

221 posts in 3153 days


#2 posted 12-16-2021 10:30 PM

Thank you. I’ll take it apart if I can figure out how to do that and replace the capacitor.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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hairy

3358 posts in 4867 days


#3 posted 12-17-2021 01:49 AM

I don’t have that same compressor, but mine will do that. Mine has an electric switch, controlled by air pressure, to turn the compressor on and off.

When the pressure drops the switch starts the compressor.,

Sometimes the switch sticks and the compressor won’t start.

A tap with a hammer usually gets it going.

-- there's someone in my head but it's not me...

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MSquared

1235 posts in 1249 days


#4 posted 12-17-2021 04:15 AM

‘hairy’ speaks the truth….. If you’re not so certain about whacking away at an electric motor, use a a nylon two-face, nylon dead blow or any soft face hammer and give it a few taps. A wood scrap piece as well. Could easily work. Hell, I’ve seen ‘rocket scientist’ electronic engineers do it! Which is where I learned.

Otherwise, the capacitor is ‘usually’ right on top. If you’re not familiar with them, ‘usually’ again, a cylinder with leads coming off of it. To be more certain, look up the model# and look at the parts list. Exploded view. Ooops!! Didn’t mean to scare you there!! ;)

-- Marty, Long Island, NY

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MrUnix

8853 posts in 3534 days


#5 posted 12-17-2021 04:20 AM

That is a universal type motor with brushes, so there should not be any capacitor or other start circuitry. Examine the switch as Hairy suggested.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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MSquared

1235 posts in 1249 days


#6 posted 12-17-2021 05:14 AM

Ah! Wasn’t aware it was a universal type motor…... Eh! Give it a whack anyway! ;)

-- Marty, Long Island, NY

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kmetzger

221 posts in 3153 days


#7 posted 12-17-2021 03:34 PM

My problem now is I can’t figure out how to disassemble the thing.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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hairy

3358 posts in 4867 days


#8 posted 12-17-2021 07:24 PM

On mine, the switch is plumbed into the same manifold that has the regulator, gauge and hose connection.

I tap on the hose connection with a piece of wood.No need to disassemble anything.

-- there's someone in my head but it's not me...

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Lazyman

8805 posts in 2722 days


#9 posted 12-17-2021 08:29 PM

In the parts schematic (fig-1 #111), it looks like the pressure switch is inside the plastic cover that encloses the pump? There should be screws on the backs side that hold the cover together. I would probably just try slapping it on the side a couple of times before I took the cover off. I would check the on/off rocker switch too just to make sure that there isn’t something wrong with it.

Another thing to try if you have another compressor is to connect hose between them with male fittings on each end and just try to pressurize the unit with about 10 to 20 lbs to see if that frees things up. You will have to open the manifold on the Dewalt unit to let air in.

Just to clarify your problem, was it working before you drained it and not after?

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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kmetzger

221 posts in 3153 days


#10 posted 12-17-2021 08:41 PM

It was working fine before I drained it. But I hadn’t drained it for months. Maybe too much moisture built up and corroded the wires.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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Lazyman

8805 posts in 2722 days


#11 posted 12-17-2021 08:55 PM

If you tipped it while draining it. Maybe some water got to the pressure switch. Maybe pressurizing it with another compressor will free it up?

If not I would use a multimeter to first do a continuity test (unplugged) on the main power switch just to eliminate the easy stuff (and make sure no wires came loose). If main power is okay, then tap the pressure switch to see if it will come loose. The next step is to remove the pressure switch and make sure that it appears to move as it should. Another continuity test if you can.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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kmetzger

221 posts in 3153 days


#12 posted 12-17-2021 10:18 PM

I want to thank everyone for trying to help with this. But I’m going to have to give up because I simply can’t get the thing apart to access the switch. I removed all the screws but there are brackets in the front and the back holding it down and I can’t find a way to get the cover off. I’ll put it in the shed and maybe one day find someone with mechanical and electrical expertise to give it a try.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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Lazyman

8805 posts in 2722 days


#13 posted 12-18-2021 01:56 AM

You might have to remove the handle?

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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kmetzger

221 posts in 3153 days


#14 posted 12-18-2021 01:57 AM

Removed handle and all the other screws, but it’s those cleats I don’t understand.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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MSquared

1235 posts in 1249 days


#15 posted 12-18-2021 02:28 AM

Alrighty then. Happy Holidays!!

-- Marty, Long Island, NY

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