Construction machine or agricultural machine having a rotating work device and method for driving the rotating work device

A construction machine or agricultural machine comprising:

• a rotatable work device for processing soil surfaces and/or for chopping material;
• and
• a drive device for the work device, the drive device having a first drive source, a switchable coupling unit between the first drive source and the work device for engaging the work device with the first drive source, and a gearing coupled to the work device,
• wherein the drive device has an additional drive unit and the machine is configured for controlling the drive device to accelerate the work device by the additional drive unit to an operating speed which would result during operation of the work device by the first drive source,
• wherein the switchable coupling unit can be switched in a slip-free and form-locking manner,
• wherein the additional drive unit is supplied by the first drive source,
• wherein a force flow is supplied in the drive device from the first drive source via the switchable coupling unit to the gearing, and
• wherein the first drive source and the additional drive unit are both able to be coupled to the gearing.