Guys, I'm stumped as to what is wrong with my compressor, it's a CH 60 gal upright with oil. I bought I used without a motor. I bought a brand new motor and it ran fine for a year or so. Now when i turn it on it will run for a minute to add much as 5 minutes or sometimes long enough build 125 psi. When it stops it's the pump that stops the motor will spin in the belt. I finally got enough nerve up to tear it apart to see what is wrong. I expected to find something that looked bad, but I didn't find anything that is even fit heavy scratch left alone gouged. The oil i drained from it was a little dark, but didn't seem to be excessively dirty. Here's some pictures I took. What do you think? I'm open to ideas.