Our steering gear is a truck ball nut hydraulic steering, type ZF Servocom. When the steering spindle is turned with the help of the cross button, the steering nut plunger is displaced in the housing cylinder. The steering shaft makes a pivoting movement. When the steering spindle is turned, one sees the function of the hydraulic control with the torsion bar, rotary valve, control jack and radial grooves. The following can also be seen: steering stop valve, ball nut plunger with toothing, steering-sector shaft and the balls in the cutaway ball cage.