The invention comprises a gluing unit, in particular for a labeling apparatus, comprising a glue roller (1) and a motor (2) for driving the glue roller (1), where the motor (2) is positioned above the glue roller (1), where the motor (2) is with respect to a support structure (3) of the motor mounted in a height-adjustable manner, and where the height of the motor (2) is adjustable using a lever, in particular using an elbow lever (23) or a rocker lever.