Thought I would share a tip. From my days of flying airplanes, I got in the habit of doing a walk around every time I get on or off the tractor.
Today I am getting ready to mow with the flail mower and needed to grease everything first. The PTO shaft is easer to grease if you take off one side at a time and rest on the mower or lift arms. Well this morning I forgot to hook back up the PTO to the tractor and it was just resting on the lift arm. Had I just jumped in a pulled away I likely would have damaged my shaft. During my walk around, I noticed it and corrected the problem before damage was done.
Take the time to do a walk around and quick check of everything each time you mount and dismount your machine. It could save you from making a mistake.