Crane with an auxiliary power unit

The mobile crane comprises a drive motor (6), which has an undercarriage (2) designed with crane function. The upper carriage (1) is pivoted on the undercarriage and is provided with crane cantilever arm (5) and a crane cabin (4). The drive motor serves as traction motor of the undercarriage and serves for the operation of the crane function of the upper carriage and serves as all common auxiliaries of the undercarriage and the upper carriage.