I looked in the manual. Boy, Howdy, is there some useful stuff in there.

Recommended oil is Mobil TDH, apparently a generally used substitute. SAE
80W. Which was odd. What's in there looks a lot thinner than 80, and it is
clear. Not sure if 80 means the same as gear grease, as 90 is almost like
toothpaste.

Funny, tho, $103 at WallyWorld, and around $30 at some places. Will have to
investigate before jumping on any one thing. Tractor guy is coming Tuesday,
and we are going to power wash it off, see where it's leaking, and fix some
things that I don't like. Add a sun screen over the seat, too. They did 14
skin freezes Friday on my skull. Lucky the bad one was not a # 2. Sure
thought it was.

Anyway, will figger out the tractor, and Jim, I couldn't find anything at
that site that had TDH. Manual also said Mobil. So, should be able to find
some cross ref with it on there. RPM Tractor hyd fluid made by GS Caltrex
is also mentioned.

I'm getting close.

Steve