Porter Cable 150 compressor fills but will not shut off

by Larry
(Reedsburg)

My compressor fills to 150 but does not trun off. I put in a new pressure switch and a new relief plug because I thought it may be leaking. Still keeps running when it hits 150-151. In the past you have mentioned a check valve. Should I replace that too?


After turning the unit off, the pressure holds well. Air tube into the pot gets really hot.

Thanks for your suggestions

Larry

____________________
Bill says...

Larry, you say that the compressor fills the tank to 150 PSI, but it won't shut off. It keeps running. When it keeps running, does the pressure stay at 150 PSI?

What is the normal cut out pressure setting for your air compressor? Did it shut off at 150 PSI before?

Give me some feedback as a comment here, please.

Cheers,

Bill


Comments for Porter Cable 150 compressor fills but will not shut off

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May 12, 2016
Relief valve
by: Arne

The relief valve engages while compressor is on and won't shut off until I turn the compressor off and push relief valve manually.

porter cable 6 gal

Jan 20, 2012
Porter 150 shut off
by: larry

150 is the cut off for that compressor and has been in the past. It now reaches that level but continues to run. I'v had it off for 3 days and it is holding it has lost only 3 pounds in that time so I think there are no leaks. Could the new pressure swith be bad? I doubt it because it is doing the same as the old one. Somethin else is going on. It is 3 years old and I worked it hard this year so it may simply be worn out.

The pressure swith on this CFBN220 type-1 is only a little micro swith inside the case.

Thanks for looking into this.

larry

________________

If the compressor reaches the normal cut out pressure and the compressor keeps running, then the pressure switch is not tripping off. Either the tank pressure is not reaching the cut out setting on the pressure switch, or the switch is pooched.

You say that the compressor runs to 150 PSI, but you don't say if the pressure in the tank continues to rise, or stays at the 150/151 level. If the pressure stays at 150/151 and goes no higher, I suspect that the switch actually wants to trip at a little higher than 150 PSI, but the pressure cannot get there as you have a mechanical issue with the pump.


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wiring in a c7501 60 gal Porter Cable compressor

I have installed a new compressor and have run 220 power to it and there is power at the pressure switch, but it won't fire up when I turn on the switch on the compressor. I am not sure that I attached the wires correctly to the pressure switch. Could anyone provide a photo or good description of how the wires should be attached to the switch? The manual is of no help. Thanks

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Porter Cable C2002 type 3 Pancake Compressor

by Tom
(Columbus, Ohio )

I have a compressor that won't shut off. It builds pressure just fine but won't shut off before the pop off valve engages. I have replaced the Pressure shut off valve and installed it correctly. but still won't shut off. Any help would be appreciated.

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Dec 28, 2014
Won't shut off
by: Bill

Hi Tom. Not a good situation, a compressor that won't shut off!

You say you replaced the "Pressure shut off valve and installed it correctly". When you say this, do you refer to the electric pressure switch?

I have to tell you that the only reason that an air compressor will continue running past the normal cut out pressure level is when the pressure switch (see that page for more info if you need it) does not trip to off, and cut the power to the motor circuit, when the air compressor reaches the normal cut out pressure level.

Please add any info as a comment here.

Cheers,

Bill

Dec 27, 2014
i got the same problem
by: dude

I've replace the pressure switch .

but when the pressure reaches 150 pop off valve engages and the motor continue running it won't shut off

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drain value is cause tank to leak air

by Todd Walton
(lebanon, IN)

Can the drain value in the tank be replaced or sealed to keep air in the tank?

________________
Bill says...

Like any valve, over time, a tank drain valve can wear if it is well used, or, more likely, have debris or rust buildup in it that prevents it from closing tightly.

Yes, you can replace them, as long as the drain if threaded into the tank, and not welded in.

If you do thread the existing drain out, after dumping all the air of course, then consider using a 90 degree instant elbow fitting that threads into the the drain port, run a few inches of 1/4" poly tube out past the edge of the tank so you can more easily access it, and then install a miniature ball valve at the end of the tube. It will do the same thing, is visible (reminding you to drain the tank) and makes it a whole lot easier to open and close the drain.

Cheers,

Bill

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