when i pull axles i always have a clean lint free shop rag ready
i put a pan under and as soon as i get the axle out i stuff up the tube with the rag then wipe up the little bit that got out
keeps things nice and tidy while you work lol
seeing youre a novice
remember to remove the rag when you put it back together lol

the axle fluid is pretty thick so youll lose only a tiny amount
i think this machine has a traditional diff with the fill level plug in the front if you raise the mast