Hustlin' Hank wrote:
On Sep 24, 8:15�am, Van Chocstraw
wrote:

The closed loop system needs to be controlled and reversed by an
external mechanical system.

Often, a hydrostatic transmission is combined with a planetary gearset
and clutches to create a hybrid system known as a hydromechanical
transmission. Hydromechanical transmissions transfer power from the
engine to the wheels in three different modes. At a low speed, power is
transmitted hydraulically, and at a high speed, power is transmitted
mechanically. Between these extremes, the transmission uses both
hydraulic and mechanical means to transfer power. Hydromechanical
transmissions are ideal for heavy-duty applications, which is why they
are common in agricultural tractors and all-terrain vehicles.

This is NOT how a Case works.

I hope you mean other types of vehicles when you state "all-terrain
vehicles", because ATV's (All-Terrain Vehicle) are all strictly
mechanical using either a wet multi-clutch system or a variable torque
converter, no hydraulics.

Hank

ATV's are made anyway that they want.