I just changed the oil on our farms XUV590M and found it quite difficult to take the filter off through the skid plate hole. It is pretty tight in there and the filter appeared to be surrounded by bolts, making it an especially tight fit with my large hands. I looked around the skid plate to see if there was an alternative route to access it and found a slight gap near the front end of the skid plate where you can reach your whole arm through. Still had to use a filter wrench, but it made it a lot easier. Hope this helps for anyone attempting this and getting as frustrated as I did! Also, reading the oil level on the dipstick after oil changing was sorta difficult due to the oil having to circulate through the transfer case. I threw in roughly 1 3/4 qts of oil in, started it for a few seconds and shifted between gears then shut it off. Waited about a minute or so and then checked the level. It was right between the low and full line so I added between 1/4-1/2 qt extra and that seemed to be just right. Definitely depends on how much you take out, but just some extra advice if its getting tricky for you.
Cheers, happy wrenching