Hello everyone. I'm a proud owner of a JD 180 (bought new), and a JD G100 purchased on craigslist about a month ago. I have a question (sorry if I should have posted elsewhere). My left rear tire went flat, so I took the tire off and took it to have it repaired (put a tube in it), replaced the tire. All was good until I tried to get the lawn mower to move. It cranked up fine but will not go forward or back. I engaged the parking brake. I can't for the life of me figure that I messed up the hydro tranny with no more than that. My JD 180 is a gear drive. I know nothing about the hydro. Any suggestions would be greatly appreciated. Thank you in advance.