Same here on my 21 Raptor XL. However, I do see what appears to be a fill plug on the top of each transmission and there is a hole in the frame to access it.
Howdy from Kansas.
My Cubcadet died on Friday and I am now an owner of a 21 Raptor XL. I have never used a ZTR before so this should be interesting. I bet I put on a heck of a show for the neighbors the first time mow.