Check this out:Link This will give you the hp and cfm specs for an x2. RPM's are not given but I would go to 1100 RPM as a MAXIMUM, although 800-900 would be preferable. I have never seen a Quincy with any appreciable crank end play, so I would be a bit suspicious about that. Never worked on an X2 though. Quincy compressors are the best you can buy, period. I THINK that the HD and SH on the tag refer to the thickness of the tank material in thousandths of an inch i.e. 125 = 1/8". Usually, the HD (head?) measurements are thicker than the shell for some reason. Most tanks I dealt with were 3/16 thick. I don't know which type of unloader you have. If it is centrifugal, you can hook up an air source and check if it leaks. When stopped, it should pass all the air you can supply to it. When operational, it should seal completely. There is probably a way to actuate it, if you take it off, probably you can move the mechanism with a screwdriver to simulate a running compressor and see if it seals against pressure. If you have head unloaders, just run air pressure to the towers and see if you can hear the plungers actuating. There should be no air hissing out of them, or the seals have failed.
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