Question about Craftsman 3 gal. Air Compressor, 1 hp, Tank

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Will pump up to #40 and thats it but it keeps running and wont shut off. it gets so hot you can smell it

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I have the same compressor and had the same problem at 40 psi.

If your air compressor builds pressure to a point, and then won't go any higher, check your gaskets. If you take the compressor apart, be prepared to replace the gaskets as they are brittle after use and most likely will tear.

Check the gasket that divides the chambers by the air intake. Make sure that there is no part of the divider gasket missing. Even a small gap can cause pressure to cease building. This is what happened to mine. It is the top gasket as you take the top off where the copper tube comes out. You can buy replacement gaskets for most brands, or you can buy a sheet of gasket material at an auto parts store for under $10 and cut your own. Try to keep the old gaskets in tact as much as possible to use them as a template.

Posted on Apr 17, 2011

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It could be faulty rings on the compressor. The reed valves may not be operating properly have to be cleaned. You could have a slite leak like a bad head gasket or leaky line. You can check that with a soap water solution around the head and fittings. If you have a leak you would see bubbles.

Posted on Mar 23, 2011

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