Yanmar 2011 LX410 with 1850hrs Went to use the tractor Monday and noticed a puddle of lube on the floor, had run down the right side tire inside. Removed wheel/tire and checked to make sure the ring of bolts was tight around the plate that hold the hub....hoping maybe they had come loose enough to allow leakage there. (BTW.....that hub housing has a big O ring, not a flat gasket....the hub housing can be pulled out 1/4-3/8" and still won't leak until you get it out enough to clear that O ring....then fluid gushes out) Refilled with 80-90w gear oil, and drove around the farm a bit. Pulled back in shop, fluid pouring out. Got out my flash drive that has the parts manual on it, looked it up...looked like it much be a seal on the inside where the hub shaft comes out. Called the place I buy part from (1 1/2 drive from here), ordered the seal, and added the bearing + big O ring on the hub housing....figuring as long as I was in there, that bearing would be easy to stick on. Turns out, that was the correct move....because that bearing was falling apart, and the ring on the inside of the bearing that holds the balls in place had come apart, and that cut the seal, causing it to leak. Good thing it did leak I guess, if the bearing had come on apart, might have caused other stuff to mess up. Parts supposed to drop ship to me today or tomorrow....fairly easy fix and I should be back in business. Interesting to note.....the inner bearing, which was fine, was Japanese.....NACHI brand. The outer bearing which failed was Korean....KBC brand. Hub housing & O ring: Hub, outer bearing (left), seal, inner bearing (right) and split keeper ring that holds the outer bearing in place. Closeup of failed bearing....you can see why it carved up the seal. Page out of parts manual I printed. Parts manuals are SO handy.....and makes it very easy to order parts on the phone when you have the part number.