Craftsman pressure switch will not engage and turn on the pump at all

by Jeff
(Des Moines, WA)

I have a Craftsman 6.0 gal / 150 PSI pancake compressor.


It has worked fine for ~15 years (very few hours of use).

I took it out to use it and it would not turn on at all.

I finally unplugged it and took the outer housing off the pressure switch assembly. I was able to determine the correct position I needed to engage the pump motor, so I pushed the rocker arm down manually so the contacts made contact and plugged it in. It worked fine, then on (turning off when reaching pressure). If I turned it off and back on, the contocts wouldn't connect again unil manually pushed down. It doesn't seem like I should have to replace the whole switch for this behavior. Is there some way to adjust or lubricate the assembly in this state to make it work again?
Thanks!
Jeff

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Bill says....

Jeff, experiment all you wish with the switch, being careful not to fry yourself in the process.

Though you'll pay around $25 for a new one, they are mass produced in China for a couple of bucks. They are so cheap that I have never found a source for parts for one. And, even for the money you'll spend to buy one retail, limiting your frustration by buying one rather than trying to fix one may be worth it.

Cheers,

Bill

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craftsman compressor freezes up at 60 psi

by Les Spencer
(New Paris, Ohio)


I have an older craftsman air compressor. it is a 2 HP 20 GAL compressor. it has a newer motor on it. when you turn it on it will fill the tank up to 60psi and then when it hits 60 it will just stop and freeze up almost as if it is in a vapor lock. I don't think that it is the motor since it is only a few years old. I think that it could be the compressor itself that is bad but am not sure yet. also when it stops the tank will start to slowly loose pressure around the fill fitting.

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Bill says.... again....

As pressure in the tank builds, the compressor has to work harder. If the run capacitor is weak, or the motor is failing, then the motor may stop at a certain point. You need to get these checked out.

I don't know what you mean by fill fitting, so I cannot comment on this issue. Please post more details here as a comment.

Cheers,

Bill

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overheating valve and piston asembly

by matt denny
(winston-salem nc)

craftsman oiless compressor got hot and melted the muffler off. to hot to touch head. now wont pump over 100 pnds and keeps running

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Bill says...

Matt, which came first, the chicken or the egg?

Nope, I'm not entirely crazy. What I mean is, was your air compressor problem caused by the high heat in the pump, or was the high heat in the pump the result of the air compressor running constantly, with no time to cool?

I suspect the latter.

Please go to the Compressor Troubleshooting page, and click the link to Will Not Build Pressure. Check out some of the issues referred to on those pages.

I fear that you may have damaged your compressor by running it too long and too hot. I hope not.

Cheers,

Bill

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