One or more components of a high pressure pump include a hydraulic surge dampener. The hydraulic surge dampener mitigates or prevents damage that results from a sudden pressure surge that results from impact of components, for example a hydraulic piston and a hydraulic head, of the high pressure pump. The hydraulic surge dampener may include one or more grooves, one or more through holes, or a combination thereof. The hydraulic surge dampener may be carried by or be part of one or more components of the high pressure pump, such as the hydraulic piston, the hydraulic head, or both.

A hydraulic cylinder may have a tube extending from a tube first end to a tube second end, and a piston in the tube. The hydraulic cylinder may also have a piston rod attached to the piston and a cushion stem extending from the piston. The hydraulic cylinder may have a head end cavity disposed adjacent to the tube first end. The hydraulic cylinder may have a cushion sleeve disposed on the cushion stem. The cushion sleeve may be received in the head end cavity. The cushion sleeve may have an inner sleeve including an opening that receives the cushion stem. Further, the cushion sleeve may have a circumferential projection extending from an outer surface of the inner sleeve. The cushion sleeve may also have an outer sleeve surrounding the inner sleeve. An inner surface of the outer sleeve may have a circumferential recess that receives the circumferential projection.