Abstract: An axial piston machine having double acting piston assemblies incorporating swivel joints from which connecting rods extend to drive points on the radial arms of a wobble plate, the central pivot of which is established by a universal joint support. The wobble plate is connected by a crankpin and a crankarm to a crankshaft establishing a precessing driving plane at a tilt angle to the crankshaft axis of preferably less than 18.degree.. A valve rotatable about the crankshaft axis controls the supply and exhaust of fluid to the piston assemblies.