the gear box is described with several areas of speed change control, the progressive transmission is effected by a hydrostatic transmission (a, b). the transmission has a high power density because the hydrostatic units (a, b) are relatively small.a clutch gear is not required between the engine and the transmission, and a gradual adjustment is provided over the full speed range of the vehicle to a full stop. a hydrostatic unit (a, b), a planetary train trip (4) and a planetary train (5) form the basic units of the gearbox.the input shaft (2) is connected to the first surface (a) and a component of the planetary train counter (4). the second table (b) can be connected alternately according to the selected range of trees of the planetary train counter (4) in the first range and in the range of.the second surface (b) is connected with the input shaft separator (2) via a planetary train (5).
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