Drive for forest machinery with one or more functions dependant upon hydraulic power, for example woodworking machinery such as harvesters or similar, containing a hydro dynamic power transfer device connected to the driving motor with at least one in and outward propelling gear, that is set up between the machine's drive and drive gear for driving these via a cog-wheel gearing, as well as a pump driven hydraulic motor connected to the machine's hydraulic system designed so that when needed and when the driving-gear driven by the machine's driving motor hydrodynamic power transfer device is disconnected, the driving-gear can be powered In order to enable the movement of such a drive with for such a movement of such a drive the machine with a weak start up independent of the number of revolutions the motor has, the hydraulic motor (19) is set up between the hydrodynamic power transfer device (15-17) and the driving-gear of the machine (10, 13) and the driveshaft through a coupling (20) that is connected to one of the gear-wheel's gear ratio (10) axles so that when the coupling (20) is connected and when the hydrodynamic power transfer device is disconnected, e.g. in neutral, the gear-wheel can be driven (10, 13) independent of the driving motor's rev count.IMAGE
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