unloader line blows off

by Steve

I inherited a Kobalt 60 gal compressor (no. 221565)from the previous owner of my house and it ran fine (once I cleared the mud wasp nests out of the motor)until it started blowing the line that fits into the unloader valve off when it reaches about 50-60 psi. The unloader valve is a Condor style with a cheap plastic push-lock style fitting. It fails at this connection every time and pops the line and compression fitting out. My question is can I retrofit a different kind of pressure switch and unloader, or could this just be a symptom of another problem, and if so, what are your suggestions?

Thank you.

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Apr 20, 2016
Unloader blowing off
by: Bill

Your compressor symptoms are not unusual, Steve.

I'm guessing the line to the unloader on the pressure switch is plastic? If so, over years, this plastic becomes "case hardened" by repeated exposure to heat etc. It becomes brittle, and cannot bind in the fitting.

Push on the collet around the line where it enters the switch and pull the line out. Cut about 1/2" or so off the line and reinsert it. That will likely resolve the issue for now.

Of course, if it's the actual fitting that's coming out of the switch, I don't know if you can change the fitting in the switch, so a new pressure switch may be necessary.

In the long term, yup, you can change switches to a different style. Read up on all about pressure switches on this site, and review the troubleshooting pages for tips.

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