seal leakage on the six speed transaxle is either a bad seal or a worn axle bushing. Jack the tractor, pull the wheel and hub, check for play on the axle up and down if you have play, pop the seal out and drive a new axle bushing in pushing the old one further in. first measure the inset of the old bushing snd drive the new one in the same distance. Protect the new seal with card stock and drive it in. You can only do this once on each axle before you run out of room.