Question about Campbell Hausfeld Single Stage Air Compressor. Single Stage Cast Iron Compressortwin Cylinder Vt Pump with Flywheel

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My compressor fills up fine then air leaks out around the pressure/ on-off switch. I think it is coming from the copper tube coming from the head.

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Those are simple compression fittings.A hydraulic repair shop should be able to get you the parts for the repair.A truck or trailer shop would have them too.

Posted on Jan 31, 2010

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1 Answer

Leaking around Pressure Switch. Ordered & replaced switch but still leaking


Some pressure switches have a valve that reliefs the compressor head pressure when the motor stops and closes the head pressure relief valve when the motor runs.
There is a check valve that keeps air pressure from coming back to the compressor head and the relief valve.
I think the check valve is leaking tank pressure to the relief valve and compressor head.
The check valve is where the pressure switch mounts on to and it mounts threaded on to the compressor tank.
Try replacing the check valve

Nov 01, 2015 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

Charge air pro model ir330e20 builds pressure to only 60 psi and will not stop running


Cbillgreene:

Your compressor is leaking air somewhere between the compressor head and the tank. With the compressor running, feel carefully around the ends of the tube that leads from the compressor head to the air tank. You will probably feel some air leaking around one end or the other. If so... remove the tube and find out which packing has failed.

Mar 09, 2013 | Craftsman Air Tools & Compressors

1 Answer

When my compressor reaches 120psi it shuts off but air comes out of the regulator. I replaced the regulator and it is still leaking air when it stops. When it reaches 90psi the pump starts again. It does...


The air is coming out of the pressure switch but the problem is the tank check valve. The tank check valve is on the tank where the large line from the pump feeds into the tank. There is also a smaller line, either plastic or copper, from the check valve to the pressure switch. When the pump shuts off the check valve is supposed to close and the pressure switch opens a valve that lets the head pressure bleed off through the small line. This lets the motor start the next time without any pressure in the head. If the check valve isn't closing properly the air will leak out as you describe.

Aug 19, 2012 | Air Tools & Compressors

1 Answer

When it runs it sounds like an air leak from the engine and the tank does not fill. i do not hear air leaking when not running.


This sounds like the compression release valve is leaking. This valve bleeds the cylinder pressure to allow the motor to start without having the load on it. On this size compressor the valve is often built into the pressure switch. It is a little "pintle" type valve and you will hear hissing while unit is running but the opressure will not build up very much. When the pressure switch calls for the unit to run, the little valve closes with the switch. COntamination or other stiction keeping the valve form closing will cause the problem. You will find this near a tube that goes to the pressure switch. The switch itself hooks into the tank, but this little tube will connect to the cylinder head or the main tube from the compressor. Yours may look similar to ones at this site:
http://www.generalairproducts.com/Fire-Protection-Products/accessories-pressure-switch-a-switches-check-drain-a-pressure-relief-valves.html
The valve is also commonly called the "unloader" valve.

Jul 29, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

Large volume of air coming out of vent


If the are coming out the vent is located at the pressure switch you have a stuck or bad tank check valve. Take the small copper line off at the pressure switch. If it blows air. replace the check valve. The check valve is located in top of the receiver tank. The copper tube removed goes back to one side of the check valve. Just remove the small tube from the check valve. Make sure there is no air pressure on the tank. remove the copper tube frome the compressor head and from the top of the check valve. Using the proper size socket,wrench,etc. remove the check valve. Inspect. If it has some type foreign material in it clean. If you fell that will correct the problem install in reverse order. I usually replace them if I have gone to the trouble of removing. Good luck!

Jul 22, 2011 | Ingersoll Rand SS5L5 Ir Electric...

1 Answer

I R Ts4 5hp 80 gal 175 psi 230 volt Air leaking from near pressure switch. Replaced switch but still leaking near 1/4 tubing. Thanks


You have a receiver tank check valve leaking. If you loosen the 1/4 tube slightly and air blows out more and will not stop replace the tank check valve. If you follow the copper line for the compressor HP head back to the tank you will see that the line screws into the check valveand the check valve screws into the tank. Bleed all air from the tank,remove the 1/4 line and the 3/4 line from the check valve. Then unscrew the check valve. Install a new check valve and connect the lines. Problem solved.

Apr 30, 2011 | Ingersoll Rand 2340/2475 Electric Air...

1 Answer

When my compressor turns off air starts to come out somewhere around the on and off switch.


If the air leak lasts for about five to ten seconds, it's supposed to do that. It's releasing the pressure in the pump head so it can start up again. If it never stops, your check valve is not working correctly. Follow the main air line, usually a copper tube to where it goes into the tank. The large brass fitting it goes into is the check valve. There should also be a black line running from the check valve to the pressure switch. You have to remove the black airline and copper tube to remove the check valve. If there is something stuck in the valve it may be useable if you can clear it out. If the valve or valve seat is damaged or the spring is broken, replace it.

Jan 21, 2011 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Compressor stops then leaks down to low setting


That little copper line is an unloading line, to bleed compressed air out of the compressor head so that the motor can more easily start the compressor. Pressor switch should be threadded into top of air tank, and the unloading valve is built into the side of the switch. When the tank reaches the high pressure setting the switch disconnects power to the motor and opens the unloading valve at the same time. The unloading valve should be connected to the compressor discharge line through a check valve with an unloading valve port upstream of the check valve. These valves are usually threaded into the top of the air tank as well. Sounds to me like your valve was leaking and someone bypassed it.

Sep 14, 2009 | Ingersoll Rand - Rand - Ir 2545K10FP Type...

1 Answer

Leaks air at the pressure switch


start your compressor and let it buid up pressure to turn off. then unplug from power.lossen the fill tube that goes from the pump to the tank. when you loosen it. if it leaks air then your check valve is bad and will have to be replaced.

Dec 25, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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