Abstract: A high pressure radial pump is disclosed for delivering a stream of water or other liquid at high velocity for jet washing or cleaning of various surfaces. The pump includes a plurality of radially extending cylinders (preferably five cylinders) connected together by an inlet manifold for admission of liquid and an outlet manifold for discharge of liquid. Each cylinder has a piston movable therein to draw in and discharge liquid at high pressure. The pistons are each provided with high pressure seals. The pistons are each connected to a centrally located ring connector driven by a rotary eccentric cam.