thanks for the advice guys, I have two old pecan harvester made by lockwood. They are self propelled units that run off of hydraulics, 30hp wisconsin engine, and some kind of hydrostatic transmission. The hydraulic pump runs the front sweepers and cylinder for the rear stearing. I am not sure but I think is also powers the transmission. This is the main piece of equipment I will be working on. I will be posing questions in the future I am sure. Glad to see this is a friendly site.