The invention concerns a radial piston hydraulic engine (10), which includes a rotated box section (11), with which box section (11) a cam ring (12) is connected. The radial piston hydraulic engine (10) includes a fixed non-rotary shaft (14), with which a cylinder body (15) in a fixed position is connected. The radial piston hydraulic engine includes a distributor (13), which is connected with the box section (11) and rotates together with it, whereby through channels located in the distributor a pressurised medium is conducted to pistons (16a1, 16a2 . . . ) of cylinders (P1, P2 . . . ) controlled by the distributing valve, that is, by distributor (13), and that at least some cylinders (P1, P2 . . . ) include in connection with themselves a shut-off valve (70a1, 70a2 . . . ), which is used to make some pistons (16a1, 16a2 . . . ) inoperative. Shaft (14) includes in the same cylinder block (I) at least two control pressure channels (Y1, Y2) for the shut-off valves (70a1, 70a2) of its cylinder body (15), whereby by supplying pressure selectively into a channel (Y1 or Y2; Y1 and Y2) it is possible to make certain cylinders (P1, P2 . . . ) inoperative by directing control pressure to the shut-off valves (70a1, 70a2, 70a3 . . . ).
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