Factory shop manual for TL10V2 does not include info on diving into either side (hyd or gear) of a final drive. The sun gear splines, along with the motor shaft inner splines, are stripped out. Looking through the internet, it may also be the same as a SVL75 Kubota. Anyone have teardown instructions handy?
Usually but not always the model number relates to the motor size. With that info getting parts may not to bad, Danfoss could be a good starting point. 32cc motor?