The unit has a hydrostatic transmission with two hydrostatic units (23, 33) e.g. pump and motor, that are connected in a pressure fluid circuit. A feeding pump (80) conveys pressurized fluid from a pressure fluid reservoir i.e. oil sump (91), into the pres...

The drive shaft connected to the engine (1) operates three pumps. The first pump (2) may be a variable capacity pump which is connected to control valves (8,9,19,20,21) and a hydraulic motor (7) which drives the wheels. The second (3) and third (4) hydraul...