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Submitted by: MEP1

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Your problem could also be a weak wiring issue. You may have a bad connection, a failing outlet, too long an extension cord, really any number of things could cause the same symptoms. The easiest way to tell if it's the wiring is to plug in an incandescent bulb as close to the compressor as you can, on the same circuit and extension cord if possible. If it dims way out when it's trying to start with pressure, or if it dims a lot before it shuts down at full pressure, it's an electrical supply problem. If you hear the 'whoosh' of air when it builds pressure and shuts down normally, the unloader is working properly. <br /> <hr /> <br /> Now that's an excellent tip! Use a trouble lamp in the same circuit to get a visual on how much power is being drawn as the compressor starts. Most excellent! Thanks, Bill

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Submitted by: yang

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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 dont know much about air compressor, but I was thinking it maybe the switch or something in the motor compressing air. please help thanks <br /> <hr /> <br /> <b>Bill say...</b> Thanks for your questions. I'd move this one to a different area in the website, but if I didn't you might no be able to find the answers, so I've left it here. 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). Cheers, Bill;

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