A piston pump includes a pump housing with an extrusion-formed crankshaft chamber having a top chamber wall integrally extrusion-formed with at least one side chamber wall and a bottom chamber wall. Each wall has an extrusion-formed interior and exterior surface. The pump housing also includes a pumping chamber and one or more piston passages. A crankshaft is rotatably mounted within the crankshaft chamber and extends along a longitudinal crankshaft rotation axis. One or more cams are distributed along the crankshaft axis. One or more pistons are provided, each corresponding to a cam and slidably mounted in a piston passage between a nose position and a heel position. Each piston includes a piston shaft, with a first shaft end positioned in the crankshaft chamber and having a cam engagement side in contact with the corresponding cam. The crankshaft chamber extrusion direction is parallel to the crankshaft axis.