Charge air pro air compressor pressure switch problem?

by candace
(scottsville, ky)

Charge Air Pro Compressor

Charge Air Pro Compressor

My charge air pro air compressor has a 5hp engine and hold 20 gallons of air.


I was wondering if i can change the pressure switch replacing it with one that came off of a craftsman 1.5hp 3 gallon tank.

they both have 125psi and the hook ups look similar.

the problem with my charge air pro is it gets up to 40psi and continues to run but will stop pumping air into the compressor so i shut it off and it started leaking from the little copper fitting on the side of the pressure switch.
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Hi Candace...

The simple answer is, yes, if the pressure and power ratings and pressure settings of the new pressure switch are similar to the old, and you can get the unloader interface connected, sure, you can use any pressure switch you want.

However I do not think you have a pressure switch problem.

The pressure switch controls the ON/OFF of the compressor, based on the pressure in the tank. If the pressure in the tank never gets to the normal cut out pressure setting, then your pressure switch cannot trip to off, and the compressor keeps running. That is not a pressure switch fault.

That your Charge Air Pro compressor keeps running and does not build pressure could be a plugged intake, could be in intake valve, could be a pressure valve, could be a check valve... wait a minute, your pressure switch is leaking air from the unloader, isn't it? That says to me that the tank check valve is leaking and if it is, that might be the cause of both problems.

With the tank empty remove, inspect, clean or replace the tank check valve and see what results. With any luck that will resolve both issues... though, unfortunately, I suspect that your pump has other issues that prevent it from building the tank pressure to cut off.

See the troubleshooting section on the site map page for some links to specifics.

Cheers, and let us know what happened as a comment here, will you?

Bill

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