Craftsman air compressor will not turn on or power up.

by Scott
(Mt. Vernon, OH USA)

My Craftsman air compressor was working perfectly fine Friday and Saturday while in use.


I plugged it in Sunday to finish up a break job I was doing and moved the lever to power it up and nothing happened.

Checked the plug, breaker all were unfased. Don't know if it's the power switch or something in the motor. Need help and suggestions. Found out from Sears that the power switch is no longer available and there were no suggestions on replacement power switch.

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Bill says...

Scott, assuming there is actually power flowing to the compressor pressure switch, the question is, is the power flowing through the switch to the motor?

Turn off the compressor. Drain the tank pressure to zero. Turn the compressor back on. If it doesn't start, put a meter on the line from the pressure switch to the motor and make sure power is flowing.

If not, change the pressure switch.

Take that one with you to the compressor store when you go to buy a new compressor pressure switch. I expect you'll find it's a pretty standard switch and finding another that suits will be possible.

Cheers,

Bill

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how do you change the cut in level

by gary
(grantsville md usa)

how do you change the cut in level on a craftsman 60 gallon upright oil less compresser? it just seams to take so long before it cuts in when i'm sand blasting.

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Bill says...

I'm a bit confused by your statement, Gary. Sandblasting is usually a very high air demand application. This means that usually the air tank is depleted quickly, and the compressor motor cuts back in often to try and keep up with the demand.

That it takes a long time before your compressor cuts in is a good thing, in that, it suggests that your compressor can keep up with the demand.

So, my question is, what is the pressure setting on your regulator?

If the issue isn't air flow, but air pressure, turn up the pressure on the regulator to get higher pressure and flow to the sandblaster.

If you must tinker with the pressure switch, read the page on Pressure Switch on this site for details. I advise against adjusting the switch, however.

Cheers,

Bill

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5hp compressor wont start

by David
(Chattanooga ,Tn )

I have a crafsman 5hp 240v compressor that has sat for about 6 years. I hired and electrician to wire a 240 outlet and plugged it in and nothing happened. Pulled the pressure release valve no air in the tank. Took the cover off the start switch to test for power. Power going to the switch and beyond to the motor. Power goes to the black capacitor and the white one. No power when switch turned off. No hum or click or anything from the motor. Have tested power at the switch and motor. HEEEEEEEEEEEEEEEEEEEEEEEEEELP

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Bill says...

If you have power flowing through the pressure switch to the motor, then the switch is working, since you have no pressure in the tank.

No clicks, no hums... hmmmmm, that suggests that the power is being interrupted at the start capacitor, and not getting to the motor to make a click or hum, that suggests to me that the capacitor is the problem.

Get them checked.

Cheers,

Bill

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