POWER STEERING SYSTEM

In a power steering system for a marine vehicle having a propulsion unit and an operator actuable steering helm, a power steering assist means including a hydraulic fluid cylinder-piston assembly and actuated in response to steering actuation at said steering helm, and means for maintaining anti-feed back upon a failure in the fluid source means including valve means to establish fluid communication between a fluid source means for the cylinder-piston assembly and the chamber in said assembly to either side of said piston thereby maintaining said chamber substantially full of hydraulic fluid during steering to effect movement of said piston upon steering actuation.