by: yang

Hi I have a campbell hausfeld 125 psi max . 5hp, 26gallon.

Here’s whats going on. please help.

1. my air compressor can pump air in but when it get full at 120 psi it shuts off, it did blow my fuse in the garage that was 20amp a couple of times so I changed it to a 30amp fuse, now it dont blow no more.

2. when I use the air and psi goes to 80psi or 90psi the motor kicks and try to pump air in the compressor but its struggles and seems to over heat or somethings and shut off with I belive with a clicking sound and then after a couple of seconds or a min it clicks again thinking there is a breaker built in or when it cools down, it try’s to pump again but it struggles and then shuts off again.

3. If I want to pump air in the tank at 120psi again, I would have to repeat to let go air and let it get to about 15psi and it will continue to pump air again in it.

I don’t know much about air compressor, but I was thinking it maybe the switch or something in the motor compressing air. please help thanks.

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Thanks for your questions.

If the normal cut out pressure of your compressor is 120 PSI, and when the pressure reaches that level, the breaker pops, I suspect that your pressure switch may be at fault.

I’m not sure that changing the breaker to 30 amp was a good idea. It wasn’t the breaker at fault, it was something on your compressor.

I also think it’s the pressure switch / unloader valve combination that’s part of your problem.

Your compressor struggles to start because it’s fighting to turn over against the pressure trapped over the piston in the compressor head. The unloader valve is designed to dump that pressure when the compressor reaches cut out pressure, but if the pressure switch isn’t working properly, the unloader valve possibly isn’t either.

Change your pressure switch. See if that solves all your problems (with your compressor, that is) and let us know the results if you would, along with a photo of your compressor and the pressure switch.


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