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My air compressor builds up to 40 psi and just keeps running, i have a craftsman 5 GAL, 1HP, 125 PSI and pressure goes up to 40 psi and dose not go any higher and on the other hand engine keeps running and dose not stop. Please advise?
Thanks.
Kia
If it stops running it's definatle the pressure switch. Most are adjustable by tightening the nuts holding the springs inside the switch
idealkia - I'd bet your piston ring/seal is worn. it's a straightforward job replacing them if you're able. I got a roll of cork gasket material from NAPA and made my own. They don't last long but they work well and it's CHEAP.
The pressure switch needs adjusting - need service book for that one - but I do not think the pressure switch is servicable- I think you have to have switch replaced at service centre.good luck
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The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.
Bad check valve. But I would check the regulator, by turning it down to about 10 PSI and running it and see if it builds again, if that works then it is the check valve. But from what you are saying I would replace the check valve anyways.
The compressor will not auto shut off until it reaches the preset pressure which is usually around 100-130 psi - your problem is leakage of air from the oil filler cap suggesting that you have a failed internal valve.
Unplug it and listen for air leak. What pressure does the manual tell you it should run to? The safety release could be bleeding air, listen for that, with it off. Make sure it is designed for more than 60 PSI by manufacture.
I have a 3 gallon tank..only reaches 20 psi..
When I plug it up it compresses air but something sounds broken
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