Hydraulic pumps deliver high-pressure fluid flow to the pump outlet. They are powered by mechanical energy sources and use gears, vanes, pistons or other devices to pressurize fluid. A hydraulic pump, when powered by pressurized fluid, can rotate in a reverse direction and act as a motor. It can be used for setting cement retainers where mud or cement pumps are not available.

A hydraulic hand pump is used for all varieties of low and high-pressure testing and various other oilfield uses such as removing cores from core barrels; plungers from insert liner pumps, testing valves, fittings, tubing and casing etc. It acts as an actuator for hydraulically controlled valves and hydraulically operated systems.