I was given a Gravely ZT1640 that ran for an hour or two just fine then the right wheel wouldn't push anymore. It stops like it is getting hot. Let it set for a while and it used to work again but now it doesn't. So I moved the dump valve rod(?) a couple of times and it started working again. I have changed the fluid but it didn't help. Any ideas? And is there a way to rebuild this?
