Bubble drive tote

I have a question about mechanical, cable boat steering systems? - boat transom wheels

As we speak of professional mechanical cable system for a small boat. I watched the Teleflex and UFLEX systems, but do not understand how they work. The cable seems that there is a bar at the end that the engine is measured, or connected to the crossbar. But it works like a hydraulic push-pull cable is sufficient to drive the motor, or you must be about the roles and the use of coiled springs, a voltage sufficient to create the wheel drive motors where moved?