Coleman Powermate Premium Blows fuse at 50psi

by Chris Detrick
(San Luis Obispo, CA)

I have a Coleman Powermate Premium air compressor.


I have owned it for about 10 years and have never had a problem with it before.

The other day I turned it on, the compressor filled the 30 gal tank to about 45/50 psi then blew the main breaker on the house.

I have drained the tank of water and air down to zero several times and looked at the electrical connections in the motor to see if they were getting hot or if there were any visible shorts. Nothing!

I am not 100% sure exactly how these compressors work or what would cause them to short out the fuse. Do you have any ideas of what could be causing this problem? If I need to check something can you tell me how to do that also? If you need more info please let me know.

Thanks for your help
Chris
chdetrick@aol.com

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Bill says....

Run it up again and listen to hear if the motor changes sound or anything unusual as the tank pressure approaches the failure point.

If the motor starts to change sound, could indicate an increasing load situation, and that could pull too many amps to pop the breaker.

Or, the run capacitor could be weakening, and unable to keep up with demand as the tank back pressure grows.

Or, you have a pressure switch that's failing and shorting out at the 45/50 PSI, these are my guesses based on what you have posted.

Cheers,

Bill

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Jul 24, 2011
Pressure switch
by: Chris Detrick

Thanks Bill,
Is there a simple way to test the pressure switch and capacitor or is it easier to just replace them and see what happens?

Thanks
Chris

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If you have a multi-meter, check the power flow from the pressure switch to the motor when the motor is supposed to be running. I'm trying to put together a page on capacitor testing, with not luck so far, so I cannot help you with that right now.


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coleman black max - discharge air hose is too hot

the discharge air hose is overheating. to hot to touch.

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Bill says...

The discharge air from the pump to the compressor tank can get really, really, not. Which is why that line is usually made of metal.

If the discharge hose to your air tool is getting too hot to touch, you must be running the compressor flat out and it's overheating. I'm surprised that it's still running.

Not to mention how much water is flowing down the air line too, since the air hasn't a chance to cool, and it's full of water vapor.

Or... you are using the compressor in a really hot environment, and the heat is ambient.

Never heard this one before. Good luck.

Bill

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Bleeder Valve

by Rich
(Lincon NE)

I have a Coleman Powermate Black Max 3.5 HP air compressor(model B3511). It seems to be leaking air out of the Bleeder valve (136-0013). Can I rebuild that somehow? I can not seem to find a place to buy one.
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Rich, it doesn't look like your Powermate compressor is current, as I cannot find any info on it. I wanted to see the bleeder valve 136-0013 you refer to, to make sure it is what I would call the unloader valve.

If it is the unloader, then I suspect a leaking check valve.

Cheers,

Bill

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coleman powermate motor bogging down at 100 psi

I have a coleman powermate 60 gallon 6.5 horse power older model. Runs fine until it gets to about 110 psi then it starts to bog down an it surges. Ive checked the air filter and changed the oil. What could be causing this problem
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With an empty tank and compressor off, remove, clean and replace the tank check valve.

Is the model a two stage air compressor? If so, and assuming that there has been no change in the electrical supply, I would be inclined first to check the run caps, and second, the intake valve on the second cylinder.

B.

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Apr 23, 2014
Coleman 3.5 powermate compressor needs oil?
by: Tena

Bill,
I got my compressor handed down. Dont know its age but it is showing signs of wearing out. my dad asked If I ever give it oil? Where and how?? Sometimes it starts hard (slugish) and now sounding a little funny when it is running. I really want to revive it before it is too late.
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Tena, your question doesn't include enough info for me to help, as I cannot identify the compressor from what you have written.

Please start a new thread, and with it, upload pictures of your air compressor and then we'll see if we can help.

Cheers,

Bill

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