Ron:
You have an air leak somewhere. I use a pump-spray bottle with a soap and water solution while the compressor is running. Spray the soap solution on each end of the copper tube leading from the compressor motor to the air tank and look for bubbles. Correct any bad connections (tighten and/or replace any packings) Spray each hose coupler with the solution and look for bubbles. If there are no leaks, you may have to remove the cylinder head and check the valves in the valve body between the cylinder head and the cylinder. You will need to buy replacement gaskets if you remove the head from the cylinder.
SOURCE: My craftsman air compressor model 919 16737 1.1 hp
Probably the check valve has failed. It apparently is where the pipe goes into the tank from the compressor.
SOURCE: coleman compressor no build up of pressure
your correct either the valves are worn or maybe just need cleaning as for the gaskets,idont know what part of the world your in but check out coleman on the internet or failing that ,i have maid these from gasket material suuplied from my local bearing supplier
SOURCE: coleman compressor no build up of pressure
Parts for coleman are available at www.mastertoolrepair.com your compressor is listed as L0502710. If however you like to tinker, you can make a pretty good reed valve out of aluminum can material or other (any ideas?). It is fairly easy to cut, does not last as long as factory stainless steel, but for short term, why not? Good Luck
SOURCE: I have a Craftsman model 919.152932 33 gal
Sounds like the reed valves in the head failed. you need to replace the head (usually cheaper to get a new compressor)
Testimonial: "I hated to throw away an otherwise perfect condition compressor, but I had a feeling that was going to be the answer.Thanks for your help."
SOURCE: I have a husky air compressor model WL651004AJ
You can inspect the check valve by removing it and pulling on the small plastic pin sticking out of the middle of the tank side. It should spring back under fairly light tension. Also visually inspect and clean out with a dry q-tip the brass screen on the inlet site. Seal back with ribbon dope.
If this looks ok, remove the 4 bolts holding the head on. Keep all of the sandwiched plates together in order so they go back in easliy. The cylinder sleeve will come off with this stack. Look at the plastic surround on the piston and the inside of the cylinder. In my case, this was eaten up from too many hot summers and cold winters in the garage. The rubber/plastic had hardened and eaten part of itself away. To replace the entire piston assembly on the WL651004AJ, you'll need to get part number WL211000AJ, which in some books is superseded by WL211000SJ.
If the cylinder is scored (meaning that by scraping your fingernail against the lines in it, you catch the nail) then you're probably better off replacing the whole cylinder unit.
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