An excavator shovel assembly has an excavator shovel and a shovel arm. A shovel swivel locking device locks the excavator shovel relative to the shovel arm. It has a shovel connecting lever, a shovel arm connecting lever and a rocker connecting lever. The shovel connecting lever is connected to the excavator shovel via a shovel connecting joint. The shovel arm connecting lever is connected to the shovel arm via a shovel arm connecting joint. The rocker connecting lever is connected to the shovel connecting lever via a shovel rocker connecting joint and to the shovel arm connecting lever via a shovel arm rocker connecting joint. The shovel connecting joint and the rocker connecting joints are arranged such that the rocker connecting lever is displaceable between a shovel lifting position and a shovel delivery position through a dead center position, defined by the shovel connecting joint and a rocker connecting joint.