And we FINALLY figured it out. Bleeding air from cylinders is done by raising/lowering S-L-O-W-L-Y. Also, he told me how he came to have power steering on this tractor. It was originally manual until the thing cocked up. His PSU is Teed from the line that runs to the control valve to the FEL. He didn't tell me this, but I theorised it and he says it makes sense but admits to not knowing much about hydraulics himself::: The bucket will lift the tractor and curl a load of dirt no problem bc of the mechanical advantage, but the arms take a higher pressure, which might be JUST enough to run pressure through the relief valve on the PSU, assuming it has one. Maybe, or not.