Coleman compressor won't start under a load of more than 20 pounds

by David
(Kansas City, MO)

Bypass valve sounds like it's working.


I took the starting cap to a shop and they said it was bad - sold me a new one.

No difference.

The shop said it would be $60 to check the motor, not repair.

Interestingly, a friend bought the same compressor. As with mine, it worked the first year than the same problem.
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David, I am not sure of what you mean by the bypass valve.

If you are using an extension cord, please plug the compressor right into a wall socket and retest.

If the bypass valve your refer to is not the unloader valve, and you can see the unloader valve page linked from the site map page, please check and make sure that the unloader is working.

Your symptom is that of an overloaded motor, not being able to get enough juice to get going. That is a common start problem with small compressors, electric motors, and low voltage power supplies.

Cheers,

Bill

Comments for Coleman compressor won't start under a load of more than 20 pounds

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Mar 27, 2012
Reply to Bill
by: David

Bill,
Sorry about the term, I meant the unloader valve. No extension cord used and same outlet that worked the first summer. My friend's compressor was the same and it was plugged into an outlet next to the 220 panel. Coleman also said "it had to be not enough power to the outlet" even when I said it was the same outlet that had always worked. I also tried shorting out the new starting cap with a screwdriver. After power up, it also didn't show a spark when I crossed the two terminals. That's why I'm suspicious of something else in the motor; I just don't know about the internal workings of electric motors. One person said "open field" but I don't know what that means. thanks for taking the time to reply.
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You are welcome. It still sounds like either a capacitor or motor wear issue to me.


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Coleman Powermate BV6548049 piston issue

by Michael
(Columbus OH)

I wrote about a week ago with a loud squealing noise and slow start up. You said it is most likely a piston ring problem. What type of difficulties are there in changing out rings or do I need an entire pump assembly? There is also a good amount of oil in the tank, how can I remedy that? Is there a gasket or something that may need replacing or would fixing the piston ring potentially solve the oil problem?

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Bill says....

Michael, if you are comfortable tearing down your compressor, you should be able to change piston rings. I can't tell you if you can or can't, you have to decide.

If your rings are worn and oil is bypassing the rings into the compressed air stream, and into your tank, then replacing the rings and improving the seal will reduce or eliminate the oil getting into the air.

Cheers,

Bill

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Coleman Blackmax Tire filling

by Roger
(Ohio)

My Coleman Blackmax, 5 gal compressor runs up to 100 psi, yet will not fill a tire to 35 psi - I don't get it.


So long as the pressure is greater in the compressor than is in the tire, I would think the tire would fill.

Does this make sense?Thanks, Roger
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No, it doesn't make sense, Roger. And yes, air will always from from high to low pressure.

If your air tank has 100 PSI in it, and the tire has 30 PSI, you should be able to pressurize the tire to almost 100 PSI should you wish to.

See the troubleshooting section on the sitemap page, and follow the link to no air out of hose for a number of things you can check.

Bill

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air bleeder valve just opened and will not close

by mike sabousky
(oil city pa )

5 horse coleman air compresser from sears, 10 years old bleeder valve now open and stays open why
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Mike... if by the bleeder valve you mean the unloader valve, and it's open while the compressor is running, then I suspect it's crudded up and cannot close when the pressure switch trips to power on and unloader valve closed.

If it's bleeding air continuously while the air compressor is off, then it's likely the tank check valve that is the problem.

Bill

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