Vane Motor: The reliable hydraulic vane motor with a simple design and compact size will offer overall efficiency at rated conditions and limited low-speed capability.

Gear Motor: The gear motor is compact in size and can be used for simple rotating systems.

Piston Motor: The axial piston and radial piston are the two types of hydraulic piston motors. Once one of the most popular choices, use a rotating group with rectangular vanes pushed out via springs, centrifugal force or hydraulic pressure. The offset between the vanes and cam ring allows the pump to create flow, and in variable displacement vane pumps, the offset distance is what dictates volume. Vane pumps are quiet, reliable and easy to repair. They are most popular in industrial applications, especially those running lower pressure.

• They offer the best overall volumetric efficiency
• They provide the highest pressures
• They are reliable 
• They have high power density
• They are available in variable and fixed displacement models
• In an external-gear pump, only one of the gear wheels, the drive gear, is connected to the drive. The other gear wheel, the driven gear, rotates in the opposite direction, so that the teeth of the rotating gear wheels interlock.
• There are also double external-gear pumps, which combine two gear pumps driven by the same coupling shaft. A double external-gear pump has the advantage of supplying two independent hydraulic circuits, and also provides more flow to one circuit.
• They have an eccentric internal gear wheel and an external gear wheel, also called a crown gear. 
• When the external gear rotates, volume is created between the gear wheel profiles and the external gear teeth attached to the gear housing walls.
• The product is sucked up when the two wheels disengage
• Internal-gear pumps are very quiet
• They provide a constant flow