OK, let me try to help. I use just simple Rotella 15W40. I am fairly warm here just like you in TN so it should work for you too. But make sure you use a diesel grade oil. Some use the Dello and some use the synthetics. Fine by me, as long as it is a diesel rated oil to hold the soot in suspension. The way I read my manual I wanted to change the 11 gallons o transmission/hydraulic fluid at 50. Many read it differently and don't change until 400 hrs. I was glad I changed, as a lot of "crap" that looked like maybe paint from inside the transmission housing came out. It is up to you. some do, some don't. Yes the transmission fluid and hydraulic fluid is all the same thing. I am using Mobilfluid 424. But several others are specified in the manual as well. Shell Spirax/Donax fluid specified for tractors. It must say something like formulated for wet brakes on the pail.
If you want to change just the filters not the fluid, you will need a method to make the change without loosing to much fluid. There are several methods, the vacuum cleaner method, the extreme angle parking method and my method.
My method is best. No one believes me, but trust me it is. Take a machine screw or golf tee and plug up the hole in the end of the little shepherds crook on the filler neck rubber plug. The theory is if you don't let air into the top of the "tank" then fluid won't come out very fast at all. Trust me this works. Be sure to have a chain wrench or a really big set of channel locks to be able to take the hydraulic filter loose.. The things are put on by a 800 lb Gorilla with some kind of impact took than tightened with a 10 foot cheater bar. yeah that bad. Be ready for that. Of course your tractor is much newer and it may not even be a problem any more, but in the past it has been a real problem.
Engine Oil goes in the orange rubber plug on the injector plug. You should not have any problem with the engine oil filter. I had no trouble with hydrostatic transmission filter either. I was thinking your tractor was gear so you would not have one of those.
Don't forget the final drive drains on each rear axle either. It is not just the big main drain, you will about a gallon each from those final drive cases. Be sure to do the front axle too with those low down drains by each wheel. Also when you put fluid back in the front axle check it and top up severl times after running it. it takes time to get all the air out and the actual fluid level where you want it. I hope this helped.
