Patent ID: 7249458

Claim:
A self contained hydraulic actuator system comprising; (a) a drive motor configured to rotate at a substantially constant velocity; (b) a hydraulic pump driven by said drive motor; (c) a hydraulic linear actuator in fluid communication with said hydraulic pump so as to be actuated in a first direction by a forward flow state and in a second direction by a reverse flow state; (d) a control system associated with said hydraulic pump, said control system configured to control adjustment of said hydraulic pump adjustable between said forward flow state, a non-flow state and said reverse flow state; and (e) a positioning system configures to provide positional information regarding said hydraulic linear actuator; wherein said control system includes a bi-directional stepper motor and a pulse generator associated with said stepper motor: such that a speed and direction of said adjustment is affected by pulses sent to said stepper motor by said pulse generator.