Patent ID: 8646473

Claim:
A fail-safe system for an electro-hydraulic system having a flow source and a hydraulic function, the fail-safe system comprising: a pilot controller including a directional control valve, the directional control valve being moved when the pilot controller is moved; an interlock hydraulically coupled to the directional control valve of the pilot controller, the interlock being positioned in an active position when the directional control valve is moved, and being positioned in a shutoff position when the directional control valve is not moved; a hydraulic valve having an input side coupled to the flow source and an output side coupled to the hydraulic function; and a first movement actuator for moving the hydraulic valve to a desired position, the first movement actuator moving the hydraulic valve as directed by the pilot controller when the interlock is in the active position, and not moving the hydraulic valve when the interlock is in the shutoff position.