What kind of damage would one expect from the moisture?
Dave
Depends on how much and how long. In a case of a little, the rust inhibitors of Kubota UDT can prevent the corrosive progress and no problems exist.
Leveling up, only after a teardown one might find a rust line etched into some metal that never releases particles and doesn't cause any damage other than evidence of the moisture.
Worse still, exposed rust can come loos from the parent metal and go through other componenets causing scoring, pitting or premature long term failure of an item.
The most sensative parts would be the hyd pump and valves, but water has to be sitting in them in a fair quantity to get damaged or rusted up.
Most of the time when water enters into the gear case there are at least three low points, the drain plug and both rear axle housing drains, where small amounts would normally deposit and not harm anything. Since water is more dense than oil it will of course seek the bottom so long term sitting even with some amount of water can be easily purged by opening the drains and letting the water off FIRST so that it is not mixed up by movement or use.
Hope this helps.