Eccentric screw pump for mortar

An apparatus for delivering viscous delivery material using an eccentric screw pump, comprising:

• a framework for carrying and fastening apparatus elements;
• a pump-housing portion for carrying a stator and a rotor, which is mounted for rotation in the stator and is in the form of a delivery screw;
• a suction region for introducing the delivery material;
• a pressure region for discharging the delivery material;
• an electric drive unit for driving the rotor in the stator in a first direction of rotation for delivering the delivery material;
• a control mechanism for activating the drive unit;
• at least one releasable retaining member for at least one of a rotationally fixed connection and a positionally fixed connection between the drive unit and the stator;
• wherein a change in the direction of rotation to a second direction of rotation of the electric drive unit, with the retaining member released, gives rise to automatic separation of the pump-housing portion with the stator by virtue of the rotor being unscrewed.