NOVELTY - The apparatus has a pump including cylinder blocks with low pressure fluid passages through which cylinders communicate with a low pressure manifold. The low pressure fluid passages extend outwards from the cylinders to radially outward surfaces (42) of the cylinder blocks. High pressure fluid passages through which a pair of circumferentially adjacent cylinders communicates with the manifold including an axially extending region extending towards end surfaces of the cylinder blocks at a circumferential angle.    USE - Renewable energy type-power generating apparatus i.e. wind turbine generator (claimed), for generating power from a renewable energy source i.e. wind. Can also be used as a tidal turbine generator for generating power from flowing water.    ADVANTAGE - The apparatus allows a short flow path between the cylinders and the manifold as the low-pressure fluid passages extend radially outwards from the cylinders to the radially outward surfaces of the cylinder blocks, thus minimizing resistance to fluid flow and improving efficiency of a machine. The cylinder blocks include greater axial extent while retaining structural integrity by improving strength of the cylinder blocks and reducing stress concentration so as to make the cylinder blocks smaller for a given power output of the machine, thus reducing costs and increasing efficiency of the machine. The apparatus includes axially extending regions of the high pressure fluid passages between circumferentially adjacent cylinders rather than one shared axially extending regions of the high pressure fluid passages to improve mechanical strength and resistance to bending and torsion of the cylinder blocks.    DETAILED DESCRIPTION - The pump is a pump-motor. An INDEPENDENT CLAIM is also included for a method for manufacturing a cylinder block.    DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of a cylinder block in radially inward direction.    Radial bolt hole (32)    Low pressure valve (39)    End face (40)    Radially outward surfaces of cylinder blocks (42)    Radially inward surfaces of cylinder blocks (49)