Started up my X540 last week, put brake lock on to let warm up while I opened door to outside, and she died out! What da...was my thought, got back on her and just a clunk noise at starter! Figured battery was shot but checked that out, and also attempted to jump start from from truck, and still the same clunk noise at starter! Checked brake and seat switches, also shorted solenoid and still the same clunk at starter??? I figured I've got to determine if she's locked up, so I thought I could turn the drive sheave under frame, but didn't realize that a clutch sheave is there as well making it near impossible to turn drive sheave above by hand. I also just pushed the beast thinking that would help free things up, but still no start. Tomorrow I'll take a plug out, and insert a screwdriver into cylinder, then push the mower and see if piston forces screwdriver out... I'm in a bind, this tractor is heavy, to get it on a trailer to get it to my dealer will be a tough task! Sure would appreciate any and all help and suggestions! Thanks to all ahead of time, and have a great and safe weekend!