A pump is used to move liquid into a hydraulic system. When the liquid encounters resistance, such as a cylinder or motor attached to a load, pressure results. It is this pressure that powers the system.

There are three major types of pumps commonly used in hydraulic systems:

Gear Pumps
While not as efficient and somewhat noisier than the other types of pumps, they are less expensive and more dirt tolerant. They are commonly used in compactors, car washes, and many other applications.

Piston Pumps
Generally quieter than either gear or vane pumps. They offer many control options, and provide pressure compensated control, where the GPM goes down to maintain pressure at a fixed level.

Vane Pumps
These pumps are the easiest to repair, featuring replaceable cartridge kits. In addition to single unit pumps, they are available as tandem units,  supporting high-low applications and eliminating the need for multiple motors.

Tutorial on Pumps
A primer on hydraulic pumps, if you're curious about what they do and how they work.

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