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My craftsman air compresssor the electric motor hums and the circuit breaker will open... it is an oil less compressor what is causing this

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Sounds lik motor needs now brushes

Posted on Aug 06, 2010

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Have a 30 gallon craftsman 5.5 air compresssor motor runs produces a trickle of air what wrong with it?


belt slipping ??? bad pump ??? electric or gas ??? tank drain valve open ???

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My Craftsman 15 Gal Air Compressor trips the electric breaker at start up no mater where I plug it in.


Just fixed my compressor. It would start ok when the tank was empty but trip the breaker if it tried to start with pressure. Searched and read about weak caps, or problem with check valve or pressure switch leaving pressure in the pump head, etc. Turned out that the black plastic box which holds the 2 start up caps and is attached to the end of the motor with 2 screws had cracked on the bottom. The black box had tilted out enough that the start up caps switch was not engaging. Pushed on the lower part of the box and it started perfectly. Fixed it for the cost of some 2 part epoxy. Maybe not your fail, but definitely worth checking out first.

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1 Answer

HAS POWER , BUT SEEMS TO BE LOCKED UP. The sound that it makes is a hum and no air in or out


The electric motor may have seized up from moisture or contamination. Make sure all air has been released by opening a valve or fitting.Disconnect the compressor from its power source, (Tape the power cord plug to compressor handle for extra safety) Remove motor cover, try to rotate the motor with a screw driver using just a little pressure.If the motor has brushes, make sure they are in contact and do not need replacement. Check to see if the motor has lubrication points. If so us a little WD40 or other oil based product.Place cover back on motor. Plug unit in to power source. If the unit still 'hums' turn switch off. I believe this compressor is oil less.If so the motor and compressor may be connected as a unit.If the compressor itself is froze up you may be able to separate the two and try freeing any frozen parts, again making sure the unit is disconnected.If the compressor does not respond to the suggestions given consider replacement if out of warranty.Good luck!

Mar 05, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

I have a Campbell Hausfeld oil type direct drive 7 gallon compressor. It often works fine but it frequently locks up until the internal circuit breaker cuts off the electricity to the motor. When the...


In our shop we have found the conditions you describe are almost always attributable to the power supply. First, never run a compressor on an extension cord, you are always better off running longer air lines. If you absolutely have to run an extension cord use a least a 12 guage cord no longer than 25 feet. If possible plug the compressor in as close to the circuit box as possible. Lastly the circuit the compressor is plugged into should be rated at least 15 amps, 20 amps is recommended for most compressors. Low amp lines cause the motor to overheat trying to get enough power and usually blow the circuit breaker at the motor and not at the circuit breaker. Lastly, use only compressor oil in the pump and make sure it's not overfull. This will also cause the motor to work harder and trip the circuit breaker.

Dec 17, 2010 | Campbell Hausfeld 2 - Gallon Direct Drive...

1 Answer

My 33 gallon air compressor will at start build up to 120 psi and shut off, after use and at about 80 psi the motor tries to start but kicks our circuit breaker? Any help would be greatly appreciated!


Most likely it is the unloader valve. This is inline with the air filltube from compressor to tank. Somestimes the unloader valve is screwed into the tank and air tube is attached to it. This device takes the pressure out of the tube so the compressor can start without the back pressure from in the tank. Other possibility, the start capacitors of the motor. The capacitors must give a kickstart upon startup or the motor will just hum for a couple seconds and overload the breaker. A tempoary solution is to turn off the power to compressor when it reaches 120psi, then allow the pressure to drop to 40 or less, then turn power on and mostlikey compressor will start with a load of 40psi or less. It is a nuisance but it works until you replace the bad part. Goodluck,Macgivor

Jan 16, 2010 | Craftsman Air Tools & Compressors

1 Answer

Breaker blows out when starting up compressor


there are a number of possible causes. you really need an amprobe to read the draw as the compressor starts up. Then check the label on the motor. There is also an unloader in the air loop that allows the unit to start up with no air pressure against it. to help you you really need to give alittle more info.

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Hitachi ec12 motor hums after drop in pressue


There should be a pressure switch adjustment under the cover of the switch remove the cover and reset.

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Sears Craftsman 3-Gallon, 1.5 HP Air Compressor Hums


YES IT MAY BE THE CAPACITOR . IT COULD ALSO BE THE WIREING IN THE MTR, THE PUNP ITSELF.

Nov 10, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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