The hydraulic motor is a mechanical actuator that converts hydraulic pressure and flow into torque by carrying out an angular displacement, that is, a rotation or rotation.[1]​ Its operation is the opposite of that of hydraulic pumps and is the rotary equivalent of the hydraulic cylinder. They are used above all because they deliver very large torque at small rotation speeds compared to electric motors.

There are various types of both motors and hydraulic pumps, in some models the pumps can be used as motors (when they rotate in only one direction or when the pumps are specially designed for this function) it is essential to verify that, due to its design, said pump can withstand pressure.

In all hydraulic motors, it is recommended that the drain be connected directly to the tank, without passing through other return lines or filters that could create back pressures in the drain. The best method to know the internal wear of a hydraulic motor is to measure the casing return, compare it with the parameters in the manual and verify if it is in the appropriate working range.

gear motors

They are small in size and can rotate in both directions, but the torque is small, they are noisy "Noise (sound)"), they can work at high speeds but in a manner analogous to vane motors.

Here are some advantages of gear motors:.

vane motor

They have the same structure as vane pumps, but the radial movement of the vanes must be forced, while in pumps it is due to centrifugal force.

piston engines

They are the most used of all since the greatest powers are achieved by working at high pressures. Depending on the position of the pistons with respect to the axis we can find:.

Hydraulic motors are used for various applications such as the transmission of winches and cranes "Crane (machine)", wheel motors for military vehicles, self-propelled winches, propulsion of mixers and agitators, rolling mills), crushers for cars, drilling rigs and trenchers.