Abstract: Axial piston pump comprising a rotatable cylinder block (16) within which at least one piston (20) is mounted slidable in a cylinder (18) and by rotation of the cylinder block is imparted a reciprocating movement by becoming inclined from a neutral or null position in which no pumping is effected, relatively a drive plate (14) in at least one direction. A distribution plate (22) adjustable jointly with the cylinder block (16) is formed with outlet and inlet slots (24,26) which by the inclination adjustment are caused to communicate with exhaust and intake ports (A,B) for the outflow and the reflux, respectively, of the pumped medium, which ports are formed in a stationary port plate (28). The port plate (28) has, in addition, at least one feed opening (32) for supply of pressure fluid to the pump.