craftsman 2 1/2 hp 12 gallon compressor wont shut off

by Tom Alley
(Summerfield, NC)

I have a craftsman 2 1/2 hp 12 gallon tank and it will not shut off, it keeps running until the safety relief value opens up. Also if I cut it off with the switch it will not start back up until all of the air pressor is out. Thanks for any info that you can furnish. Tom


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Bill says...

Tom, if the compressor runs past its normal cut off pressure point, the it's likely that you have a pressure switch failing.

Since your pressure switch is not tripping to cut the power, and to open the UNLOADER VALVE, then the compressor cannot restart due to the extra load on the piston.

At least, that's what it sounds like.

Cheers,

Bill



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May 05, 2013
50 gal craftsman air compressor 919.167310 will not stop
by: Pat

Model no 919.167310 runs past 150 psi. Manually shut off at close to 160psi. What test can I do to ensure auto shutdown works properly
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What is the normal cut out pressure setting? If, for example, the air compressor normally shuts off at 135 PSI, and the pressure is getting to 160 PSI and the compressor is not shutting down, the pressure will continue to rise until the PRV lets go.

This suggests your air compressor pressure switch has failed, and you need to replace it.

The "test" is the fact that the compressor keeps running past the normal cut out. The only way that can happen is if the pressure switch is not tripping off at the correct high pressure cut out.

B.

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craftsman 22 Gallon 5 hp vertical air compressor ~ manual needed please

by Andy M
(San Jose)

I need the manual for a Craftsman compressor.

I have thoroughly examined it and cannot see a model number.

It says its a 22 Gallon Max 5 HP "Professional"

It is classic Craftsman red and is a vertical portable compressor.

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Bill says....

There must be a plate on it somewhere with, if not a model number, at least a serial number?

Your request is posted. Good luck.

Bill

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