I pulled the leaf bagger and and deck off my tractor today. While I was putting the deck away, I got off the tractor to position the deck where I wanted it. All of the sudden, I saw movement out of the corner of my eye and discovered the 4110 starting to roll backwards down the hill towards the woods and gaining speed. I absolutely refused to let this end badly. I ran as fast as I could and jumped in the cab (thank god I left the door open) like a Hollywood stunt man. I'm still trying to figure out if I forgot to put the parking brake on, or if it popped loose. I am in the habit of setting the parking brake without thinking about it, so I'm just not sure why it would have been different this time. Anyway, I am chocking the wheel until I regain confidence in it. I am just hoping no one saw me in the process. There was a guy on TBN that had this happen a while ago to a small Massey and it totaled his tractor when it hit some trees. That's all I could think about when I saw it start to roll.