Do You have a manual ? These have a 2 stage clutch & to engage the PTO You will need to depress the clutch all the way down to the foot step then put the lever in the PTO mode & release clutch & it should start to rotate & have the tractor in the gear you want don't try to shift while the PTO is engaged!I have a MF 50 runs great, drives great, but the PTO wont engage. I just recently acquired this tractor so don't really know where to start.