So, all good advice. General advice to anyone with a hydro leak they can't track down is to add some UV dye to the hydro oil and track it with a black light--easy to spot. I split my tractor twice to replace that cork gasket thinking that was the leak and it turned out the leak is the lip seal (the #5 on the right side of the attachment). I could have saved myself hours of work and scaring the children when the leak was still there the second time just by using some dye.
I believe what ol'george is saying is that (in the attached image) the (circled in red) lip seals #5 (x2) and #47 can be replaced w/o breaking down the hydro ("from the exterior"). #4 is another story (please correct me if I'm wrong, anyone). The lip seals (#5) are $23 each on partstree and Cub Cadet or $37 on Amazon. The cork gasket is a no-brainer, use the Cub part.
I haven't done the repair of the #5 seal yet, hope it isn't too difficult.
I fix my own cars/trucks but would be nervous about tearing down the transmission w/o some assistance.
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