26 GAL. KOBALT COMPRESSOR GOES TO 50 LBS AND TRIPS RESET...

by DENNIS
(CRANSTON, R.I. U.S.A.)

COMPRESSOR RUNS UP TO 50 LBS.AND TRIPS RESET ON MOTOR. I PUSH RESET BUTTON AND IT RESTARTS BUT RUNS ONLY FOR 30 SECONDS TO A MINUTE. I PUSH RESET AGAIN AND IT NOW ONLY RUNS FOR 30 SECONDS AND THE SAGA CONTINUES.IT TAKES ABOUT 20 RESET PUSHES TO GET TO100 LBS. THE UNIT IS A YEAR OLD KOBALT 26 GAL. ELECTRIC COMPRESSOR.

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Dennis, it sounds as though your motor is overheating, and going off on thermal overload.

Each time you reset it, the motor likely hasn't cooled enough, and it reaches thermal overload more quickly, and kicks out sooner.

You are doing your motor damage by continuously hitting the reset before the motor has time to cool completely.

The motor is getting too hot because it cannot handle the load being put on it by the back pressure of the air in the tank.

Reasons why this happens are many fold, unfortunately, and there isn't enough info here to try and nail down a specific cause.

If you are using an extension cord, plug the compressor directly into a wall socket and see if that makes a difference.

Dump the air, remove, clean and replace the tank check valve.

Check the capacitor (see page linked from site map) to make sure it's OK.

Any difference in sound when the compressor is running?

Next I would get a load test on the motor.

And then, I would assume a mechanical issue inside the pump, and I tear it down, looking for valve or gasket failures.

Cheers,

Bill

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Nov 26, 2012
Where is my air pressure?
by: Anonymous

Hi, I have a Kobalt 30 gallon air compressor. I do not leave it plugged in due to the fact I do not want it engaging all the time due to I only use it when I have a flat tire or such. When plugged in seems to engage frequently (Even while not in use). So I normally unplug it after I use it. When I unplug it there is normally a lot of air pressure still inside the tank, my thinking is I should be able to use it again later without having to plug in the compressor and restart it. Is this a correct assumption?

Because when I go to use it after it has been unplugged, I get no air pressure out of the hose...? My dad has a Craftsman which you can walk up to anytime with or without it being turned on and the it always has air pressure still built up inside ready to use. It appears mine doesn't do the same. Is mine malfunctioning in your opinion? Help me understand how this thing should hold air and when it should lose its air and how that works...please.
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If you think about your Kobalt air compressor as simply and air tank, then, after the compressor has filled the tank and shuts off, the pressure in the tank should be available at any time.

If you have air pressure in the tank, and you plug an air line into the discharge coupler, then air should flow to the air tool.

When you say "Is this a correct assumption? " the answer is yes, you should be able to use the air later.

A couple of things affect this.

1) If you have a leak in any fitting, over time, the pressure in the tank will decay to the point where you have no pressure left to flow.

2) If your tank is small, even with 120 PSI in the tank or so, if you go to use a high demand air tool and the compressor is not plugged in, your air supply will degrade very quickly and you will be out of air.

I have a small tank on my compressor and it's good for 15-20 shots of an air nailer, or maybe 30 seconds of blow off, before the air pressure in the tank falls to below cut in and the compressor starts to run to build air pressure in the tank again.

B.

Mar 10, 2012
THIS IS WHAT I DID
by: DENNIS, CRANSTON R.I.

BILL, THANKS FOR YOUR EARLIER COMMENTS: I PULLED AND CLEANED THE CHECK VALVE. IT LOOKED O.K.. I RAN IT WITH THE INTAKE FILTER M.T. I HAD IT ON A DEDICATED 20 AMP CIRCUIT. IT DID THE SAME THING. AFTER 3 RESETS(LETTING IT COOL BETWEEN RESETS) IT GOT TO 100 PSI. THE MOTOR HAD NO SOUND VARIATION. AFTER LETTING IT SET FOR 2 HRS, NOW IT WILL NOT START AT ALL.I PULLED THE MOTOR COVER AND CHECKED CONNECTIONS AND I CAN SPIN THE MOTOR WITH THE FAN, PISTON GOES UP AND DOWN AND YOU CAN HEAR THE VALVE OPEN AND CLOSE. IT HAS 2 CAPACITORS MOUNTED ON THE MOTOR, I IMAGINE START AND RUN CAPACITORS ON THE 1.5 H.P. MOTOR.I DON,T SEE ANY FUSES.WHEN I GET THE MOTOR CHECKED OUT IS T WISE TO RUN IT WITH NO CHECK VALVE GUTS WHILE WATCHING THE PRESSURE GAUGE TO AVOID THE BIG BANG IN ORDER TO CHECK IF THE VALVE IS BAD. THANKS FOR YOUR HELP.

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I don't think your PRV has anything to do with the compressor problem. I think it's time to check the caps. (see page linked from site map)

Mar 03, 2012
Forgot intake filter
by: Anonymous

Oh, and I forgot, try running the air compressor with the intake filter off, just for one cycle. If it makes a difference, your intake filter might be plugged.

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Kobalt KLA1583009

by Steven
(Georgia)

I bought this compressor from Lowes a couple years ago so it is out of warranty. This model has digital push button pressure controls. I am not a fan of these but its what I am stuck with. Everything was working fine until today when the tank dropped to about 30 PSI & motor wouldn't start back up. The motor is making a constant clicking noise as if it is trying to start but never will. Any ideas on what could be wrong or how to repair this?

Thanks in advance.

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Bill says...

I believe that your digital push button pressure control allows you to set the downstream air pressure setting of the regulator, but does not affect the cut in and cut out pressure setting of the pressure switch that controls the compressor on-off.

If the clicking noise is coming from the pressure switch, then I suspect a switch failure.

You will need to remove the shroud to locate and check this.

The clicking noise might also indicate a start capacitor problem.

Cheers,

Bill

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