Hydrostatic motor as hydraulic starter for an internal combustion engine

The hydrostatic engine (7) has a hydraulic starter configured for starting an internal combustion engine (2). The displacement volume of the engine is adjusted by volume positioning device (50) connected to an adjusting device (52). The volume positioning device configured to provide maximum displacement volume by appropriate actuation of the actuating device before stopping the internal combustion engine. A safety device (60) is provided to hold the volume positioning device in the position of maximum displacement volume, when combustion engine is turned-off. Independent claims are included for the following: (1) a power train of vehicle; and (2) a method for the operation of a power train of the vehicle .