If you are talking about a 1450 Cub Cadet it is probably the tow relief valves. Later ones like that are automatic, no lever to lift for towing. They are known for sticking and leaking. There is a guy on Ebay rebuilding valves. New ones are available but pricey. They are pretty easy to get at right on top of the hydro unit. Google cub cadet 1450 hydro relief valves for lots of information.