<p>The self-propelled harvester (1) has a drive unit (8) with at least two drive motors (14) associated with at least one common transmission unit (9) transferring a torsional movement. A control and regulating device (30) is provided for controlling the chain for switching on the at least one additional drive motor : The drive unit can form a compact structural unit which can be pre-assembled as a module. A secondary frame rigidly connects the drive motors at the top to the torque-transferring unit.</p>
