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This problem is caused by either the starter capacitor or the in-tank check valve. Ez to check. With no air in tank, start compressor; if motor hums or has difficulty suspect capacitor. If motor starts, partially fill tank and unplug the power. Check for air leaking at the pressure switch or air coming out of the air inlet (remove the air filter). If air leaking, replace check valve. If no air leaking, again let out all the from the tank and connect power. Allow the compressor to fill and shut-off. After the compressor fills, again listen for air leaking from the pressure switch unloader valve. If air continues to leak from unloader, replace the check valve. Good luck
sounds like the motor is seized, disconnect power then open the rear cover and use a wrench to free the motor. If the motor spins freely you may have a faulty motor starting capacitor
Oil free compressors are used when oil could contaminate food products, or maybe spraying where oil down the line would ruin a spray job, although adequate filtration to stop the oil getting to point of use
Are you a mechanical type person? There is a fast and easy way to test the motor but it is not recommended for anyone who doesn't do this for a living. I have replaced 4 shaded pole motors in the last 3 years that did the same thing and never had a problem with a capacitor start or capacitor start/run motor. If the motor hums, it is trying to run. Try giving the stator help getting started while the motor is humming. Use a small piece of wood or soft plastic. Any non-conductor will do. Look inside the rear of the motor and you will see the field coils around the outside surface and the stator is the round thing in the middle of the motor that rotates. Use the non-conductor to start it turning in the direction it would normally run while the motor is humming. If the motor starts and runs ontill the pressure switch shuts it off, the motor is bad. If it has a capacitor on it, try replacing that first. Please let me know how this works out for you.
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!
Your compressor is most likely made by Campbell Hausfeld. The oily substance could be leaking from the capacitor on the motor. Remove the cover and examine the capacitor for failure. There is a value printed on the cap. (uf) The cap must measure to within 95% of printed value. A failing capacitor will cause the hum that you are experiencing.
All electric compressors share a basic design with ac power pressure switch with unloader and checkvalve between the pump and the tank. When the pressure switch powers off, it unloads the compressor by releasing the air in the discharge hose. You will notice a small tire stem pin and a lever to engage it somewhere on the pressure switch. If the compressor stops before reaching set cutoff point, the air pressure remains in the discharge hose not allowing the motor to start, thus the hum you hear. Solution is to check for the proper function of pressure switch /unloader, tank check valve (if check valve leaks air back to compressor it will load motor causing hum) and extra measure check capacitor for at least 90% of rated valve. Finally, do not run this compressor with an extension cord, use more hose instead. enjoy
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