Craftsman 6 hp twin valve 220 compressor will not build pressue over 60PSI

by Ben Howatt
(Gastonia, NC, USA)

The compressor will start and run and will not turn off.


I bought it from my person who use to live beside me.

I just tried to use it and notice that the air filter is off the unit and both muffler intakes are exsposed. One side sucks air and blows it out as well and the other side does not do anything unless i cover teh other side and it then blows a little as well. both pistons are moving as well. because of it not building pressure above 60PSI - it will not turn off becqusse it never gets to the right pressure.

After I turn the pump off - I also hear a very little of air comping out near the releif valve - but like I said it is very lite.

Model is craftsman 919.152930 annd pump is a AO Smith 4000

Thanks

Ben
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Ben, from what you have posted, it sounds to me as though the valve(s) is not working properly. Air should be pulled into the intake port, not blown back out.

Bill

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Model 106.154780 will not shut off

by Chuck
(Cameron, WV (USA))

I have a Craftsman Twin Cylinder Tank Type Paint Sprayer Model 106.154780 which will not shut off at 125psi. It just keeps running even after the safety valve has opened up. Other than this it works just fine.
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Chuck, if it is supposed to cut out at 125 PSI and doesn't, and the pressure in the tank rises past that pressure level, that suggests that your pressure switch has failed.

Cheers,

Bill

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HOw to determine valve plates and reeds, plates, and gaskets are bad

by Robert Hall
(Browns Mills, nj)

can you let me know how to determine whether the valve plates, valve reeds, and thin metal gaskets between the valve plates on a model 921153100 craftman 3 gallon compressor...i can't find any gasket leaks from the outside, but there is air huffing from the air filter intake....upon taking it all apart everything looks normal...how do i determine which parts are bad and why?

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Bill says....

Good questions, Robert. And you are right, it is hard to tell from looking sometimes.

I can tell you that if you have air blowing back out the air intake, then for sure, your intake valve is failing or at the very least, is not seating properly, regardless of what it looks like.

Also, have a look at this page for more details:

www.about-air-compressors.com/reed-valve-failure.html

Cheers,

Bill

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