Question about Dewalt Air Tools & Compressors
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Posted on Jan 02, 2017
SOURCE: compressor will not shut off
My emglo electric air compressor will not shut off when it reaches 90psi that I set it for and it keeps going so I have to shut it off manually because I am afraid it will blow up if I don't shut it off . The switch works manually,;what is stoping it from working automatically to the pressure I set it at? Model # AM78HC4V
Posted on Jan 01, 2009
I had the same problem. Replace the motor capacitor. small white cilinder part with two wire plugs conected to it. This will have a single bolt holding it to the frame casing, you will find it under the black plastic shroud that covers the motor. Take it into any electrical or compressor shop and they will check it for you. costs about $35.00.
Posted on Jul 07, 2009
It could be a couple of things. To me it sounds like you have a short in the motor or damage to the cylinder and piston. You need special equipment in order to test the armature and field for a short. There may also be damage to the brushes and brush holder. There could also be a problem with the cylinder and piston. The bearing could be bad causing a hard start for the motor. I think it could be the combination of the two problems listed above. You may want to check the pump first and if that is not the problem it is an electrical short in your motor in which case you should buy a new compressor. It will cost more to fix if the motor is damage than to buy a new one. "BER" Beyond Economical Repair.
Posted on Oct 01, 2009
there is aweb site called www.mastertoolrepair.com in the search type am77 should get schematic break down for your compressor, then go to internal parts and you should get a brek down and schematic on your compressor hope that helps
Posted on Oct 27, 2009
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