The high-pressure hydraulic Dyna-Star grease injection pump is designed for wireline, slickline, and wire rope applications. It is capable of operating at pressures up to 10,000 psi, even with low flow rates, and reduces freezing, stopping, and stalling. The pump requires about one-third of the energy of pneumatic pumps, and operates more quietly. It is self-lubricating, reducing the need for maintenance, and suitable for oil and gas well services, as well as for preventing internal corrosion in the wire rope applications.