MH49
Member
- Joined
- May 21, 2008
- Messages
- 37
- Location
- Ohio
- Tractor
- CASE IH 5220; Cockshutt 570 (2x); Massey Harris 44; Ford NAA; 1872 Super Cub; MF 14, 12 and 10 Garden Tractors
Joel, I am confused with your question because a Hydrostatic transmission is a pump tied to a motor into a differential. If you are refering to one pump driving all machine functions, the main problem is that you loose dynamic braking with a system like that. In other words, you have no hold-back when you go down a hill. As someone mentioned, for heavy pulling like plowing, discing, they really stink. But for PTO jobs like mowers etc, they work real good.
A side note, most modern ag tractors with a CVT type transmission use a hydrostatic transmission in parallel with a mechanical drivetrain to get it's variable speed. Also large dozers like the D8 and up Cat uses a hydrostat to control the differential steering. I don't know all the details on that one but think what happens when you jack a car up and you turn one wheel clockwise and the other with go counter-clockwise.
A side note, most modern ag tractors with a CVT type transmission use a hydrostatic transmission in parallel with a mechanical drivetrain to get it's variable speed. Also large dozers like the D8 and up Cat uses a hydrostat to control the differential steering. I don't know all the details on that one but think what happens when you jack a car up and you turn one wheel clockwise and the other with go counter-clockwise.