riding snowblower broke

I am hoping one you guys would shed some light on an issue I am having with a cub cadet. It's a riding tractor with a snow blower attachment on it. Cub Cadet model 3184. I have little or no reverse in it. Plenty of power with forward, steering, and other hydraulics. Since it is hydrstatic I am not sure where to begin. I am thinking that it may be a check valve or a relief valve. Any ideas?

 

any plastic gears in it? sounds like reverse may be shot

 

I just fixed it 20 mins ago. The transmision engage lever was unhooked behind the back of the tractor. And I coudlnt see it. Easy fix. I seriously have been with out it for two weeks. Just dodging the bullet. And today we are getting dumped on. My back was about to be broke if I didnt get the tractor working.