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Old 08-03-2012, 03:02 PM   #16
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Compressor repair help


No, pressure jsut sits there. I can get it to pump up about 10 psi at a time if I keep shutting it off and turning it on.

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Old 08-03-2012, 04:21 PM   #17
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Okay, this late breaking information changes things a bit. If it only runs long enough to increase the pressure 10 psi at a time, I would suspect that thermal overload on the motor is kicking out. If you are running this on an extension cord, unplug it, plug it directly into a wall receptacle, and try it that way. If the results are the same, although perhaps not quite as likely, if you are running this in a garage, shed, or other building separate from where your main panel is located, take it to that building and try it, again, without an extension cord.
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Old 08-04-2012, 12:37 PM   #18
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Darn, I thought you had it. I ran it from a 20 amp outlet on my generator and it did the same thing but it went to 75 psi to start. I do have more info though. When it kicks out, it releases a small amount of air from the check valve for a short time then holds pressure. I put the old check valve back in and it does the same thing.

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Old 08-04-2012, 12:44 PM   #19
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One more thing; the pressure switch never opens.
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Old 08-04-2012, 03:26 PM   #20
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The little bit of air that blows off when it shuts off is normal; that is the unloader, releasing pressure in the discharge line between the head and tank, which it is supposed to do. Running an air compressor on a generator is never a good idea, in my opinion, due to the initial current draw at startup, which can easily double the current draw, or more. I am out of ideas, other than the fact that I still suspect that the motor is kicking out due to an inadequate power supply, the pump is siezing, or the motor itself is bad. The fact that the contacts in your pressure switch are not moving pretty much confirms that fact, in my opinion. If your house has older wiring, maybe haul it to a buddy's, and see how it works there. Otherwise, good luck. Maybe someone else will have some other ideas.
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Old 08-05-2012, 08:02 AM   #21
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Compressor repair help


Could be the reed flapper valves in the compressor head. I think both
oil and oil less compressors have them. They are thin strips of metal that act as valve so compression can happen. If broken,rusted,cracked they can keep the compressor from coming up to full pressure. Most compressors have 2 to 4 of these.. They aren't expensive but a new head gasket will need to be made or purchased if replaced or inspected.



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Old 08-05-2012, 11:29 AM   #22
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It doesn't look like they sell the flapper valves. My next option is to buy a complete motor and pump unit for $196. That seems too much. I think I should cut my losses and send back the pressure switch, then go buy a new compressor. Do you agree?

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