Hi Bob, good to see you here at ODK again.

With regard to the hydrostatic transmission, there is an application manual for that family of Eatons here:
http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1619.pdf

The bypass, also known as the transit lever or freewheel lever, is the same thing Eaton call the dump valve. You can see its location in the manual referred to above:
[Linked Image]