The 185 came with either an Eaton or a Sundstrand hydrostatic transmission, depending on the serial number break. I believe the earlier ones had the Eaton, same as the 111H, 112L, 116H, 165 and 175 lawn tractors. The later 185s used the Sundstrand.
The trans is a Sundstrand. I originally bought the 185 as a parts tractor it because the trans in my 165 stripped a gear spline (that mates with the axel spline) and I was going to swap in the Sundstrand out of the 185. Well, that proved more difficult that I originally thought, so I got the 185 running and did what I had to do. Later I fixed the 165 trans and the 185 has just been sitting around taking up space.
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