Hydraulic pumps of the PGZ type are gerotor pumps with fixed displacement. The gearing with cycloid contour is characterized by a large meshing length. Filling zone and displacement area cover a large rotation angle. This results in low flow pulsation and thus very low operating noise. The shaft and the displacer are supported by a slide bearing and work in a wear-free manner when used as intended. Gerotor pumps PGZ are self-priming. Use for cooling, filtration or lubrication circuits at low pressures in industrial or mobile applications, e.g. plastics processing machines, machine tools, presses and wind turbines.