craftman 1hp that run and build 20 lbs and keeps runing.willnot shut off.
by Merle Fish
how can you check a reed valve. There just two flat metal strips.They look ok.no visiable damage.Thanks Merle
If there is no visible damage or contamination on the sealing points, then it may not be the valves at all. Could be a gasket that lets go at 20 PSI, Merle.
The only way I can check the intake valve is to feel if the compressor is huffing air out the intake port while the unit is running.
Clean 'em up, make sure they seat flat, reassemble, and if the compressor still won't build pressure past 20 PSI, and the motor isn't lugging or you hear any strange mechanical type sounds - pump coming apart :-) for example - then I'd replace the gaskets too. If you have gasket material available, maybe do that before you reassemble, just in?
Craftsman 919152811 Oilless Compressor will not build pressure past 30psi
by Rick Schaefer
(Kansas City, KS)
I have read several post about this issue but all of them refer back to valves and i can not see where this compressor has valves in it. Any help would be great.
Rick, when I blow up the photo to get a closer look, it gets kind of blurry.
However, if you look at the right side column, the third down on the right appears to be the valve plate. It would be the same on both sides.
The valves in question are thin sheets of shaped metal, also sometimes referred to as reeds, and they flutter on intake and compression.
I suspect that it's your valve plates that you will need to replace.