In the 757 cockpit, all of this is controlled by the pilot ( 1st officer in the port seat) turning a hand wheel on his left side called the "tiller wheel". I assume this is the same general design. I spent about 2 hours in a 757 simulator and one of the things I wanted to experience was to taxi a 757 on ice. As I was applying power to one engine to make a turn, the plane began to shudder when I hit a dry spot on the pavement. The instructor quickly told me to straighten out the tiller. I had the nose gear sideways and the tires apparently didn't like that.