A rotary sliding vane type of fluid pump or motor has a rotor with loosely fitted vanes radially slidable in the rotor slots to follow the varying contour of the cam ring. Hydraulic pressure to project the vanes outwardly is fed to their inner ends along three paths comprising the side clearance between the slot and the vane which is open directly to one of the working chambers, a first set of pressure feed holes communicating with the bottom of each slot in turn, and a second set of pressure feed holes communicating with a widened portion of each slot in turn intermediate its ends.
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