I'm sure you don't have a Hydramatic transmission in your cub cadet.
"Hydramatic" is a 4 speed transmission that was built in Ypsilanti Mi. for the 1940 and succeeding years Olds/Cadillac, and in later years, more Gm vehicles.
You have a Hydrostatic variable speed unit built by Sundstrand (now sunstrand/sauer/Danfoss.
They built for many mobile vehicles, including cub cadet/IH John Deere, Massey,Cushman, just to name a few.
You can use Hy tran, Hy guard or any hydraulic oil that is equal to them as well as ATF type F as per sundstrand.
A lot of folks go to there local farm & fleet store and purchase their brand.
I find 303 hyd oil is a bit thick for cooler temps.
Some say it just will not flow under freezing temps.
If you are the type of person that has to have genuine Harley oil in yer Harley,
Then you do as your feelings dictate.
