Below is a list of Hydraulic Drive Motors manufacturers from Covina, California. Hydraulic drive motors are used in hydraulic systems or transmissions to generate large amounts of power through use of hydraulic fluid and pressure. The motor is one component of a three part system that uses a hydraulic pump driven by an electric motor or combustion engine to force hydraulic fluid such as oil through the valves, filters and piping to enter the motor and cause the motor to generate torque and rotational energy.