Porter-Cable CPF6020 Type 0 trips breaker when restart attempted

by Terry
(Central Florida)

Porter-Cable CPF6020 air compressor

Porter-Cable CPF6020 air compressor

Porter-Cable CPF6020 air compressor
Porter Cable CPF6020 compressor label
Porter-Cable CPF6020 compressor

Looking for some help, please.


Have replaced the pressure switch w/unloader valve, the start capacitor and tank check valve but will not restart after building pressure over 40 lbs even with the unit plugged directly into a 20A circuit .

It will, however, start and run like a new one when the tank is completely empty.

Otherwise this unit has provided great service for the last 14 years.

Any ideas?

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Jun 28, 2015
Centrifugal switch
by: Bill

Terry, you are welcome.

The problem you found sounds like the centrifugal switch to me.

Glad to have been what little help I was. It's you who is to be congratulated for your systematic approach and use of logic.

Bill

Jun 28, 2015
Restart issue solved!
by: Terry

Thanks so much for your response, Bill.

Couldn't stand the idea this machine had the best of me so I did some more research here on your blog and came up with maybe it's the run capacitor as indicated on another post. Didn't think so right off but what the heck.

While disconnecting the capacitor holder off the back of the motor I noticed there was a screw on the bottom but not connected to the holder.......broken.

Went ahead and got the particulars for the run cap and while doing so I noticed what looked like a spring loaded switch between the caps. Looking closer, one of the wires from the start cap went to one side of the switch and the wire on the other side of the switch headed for the motor.

Logic demanded that something tripped the switch causing continuity in the wires, but what?

Then I noticed a spring loaded disc on the end of the motor shaft and deduced that it somehow activated the previously mentioned switch.

Well, some super glue and tie straps later the cap holder was once again snugged up to the back of the motor. That did the trick and we're back in business.

As for the parts....14 yrs of usage so I guess it was time to do a change out, anyway. Great site and, again, thanks, Bill!

Jun 28, 2015
Porter-Cable CPF6020 compressor
by: Bill

Hello Terry.

Based on what you've written it seems to me that the issue is load-related. By that, I mean that the compressor will start problem free with no back-pressure from the tank pressure as you say, but cannot start when it is trying to do so when there is a force against which the compressor has to pump, and that's the increasing pressure in the tank.

Please dump all the tank air and run the compressor up to cut out. Make 100% sure that - even though it's part of the pressure switch - that your unloader valve actually unloads after the compressor reaches cut out and stops. It sounds to me that even though you replaced the switch with a new unloader valve, that may still be the problem.

Failing that, and with a new start capacitor already installed, then it's got to be something with the motor itself, I expect. Can't think of anything else it might be if all the components you replaced are working properly.

Bill

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