Abstract: The invention relates to a radial-piston hydraulic motor (10), having at least one cylinder groups (1) placed in a stationary position, which. cylinder groups contain piston mechanisms moving radially back and forth. A cam ring (12) is connected with a box frame (11) and the box frame with a distributor valve (13), which controls the pressurized fluid flow at the correct time into the cylinder spaces of the pistons that are at the power stage. The sense of rotation of the motor can be reversed by reversing the direction of flow of the fluid through the distributor valve (13). The fluid is passed to the distributor valve (13) through the sets of ducts in the shaft (14) which is placed in a stationary position together with the cylinder frame(s) (15) of at least one cylinder groups (1). The distributor (13) has a duct (31) which communicates with the power pressure and which is opened on the side face (13a) of the distributor (13).

Abstract: A radial-piston hydraulic motor and method for regulating a radial-piston hydraulic motor including one or more cylinder groups, each cylinder group having piston mechanisms that move radially back and forth. The piston mechanisms include a piston and a press wheel. The volume per revolution of the motor can be changed in one or more stages so that the press wheels of one or more of the piston mechanisms come out of contact with a cam ring. The hydraulic motor also includes a closing valve for closing the flow of working pressure to one or more of the piston mechanisms.