Apparatus with rear and front power lift, common regulating and control elements, and changeover valve

In an apparatus having coupled therewith a rear and a front hydraulic power lift for raising and lowering implements, with each power lift including a lifting cylinder;

• actuation of the rear power lift being a function of not only pick-up determined measurement of values of respectively working resistance and position, comparison values of respectively working resistance and position, and mixed values of respectively working resistance and position of an implement as well as cylinder pressure, but also of random setting of the rear power lift;
• said apparatus having the improvement therewith comprising function regulating elements in common for the rear and the front power lifts, an operation control element in common for the rear and the front power lifts, and a changeover valve in common with both of said lifting cylinders for effecting actuation of the rear power lift as a function of the aforementioned values, and for effecting actuation of the front power lift, even for a single operation, as a function of at least one of said aforementioned values also applicable for operation said rear power lift;
• said lifting cylinders of said power lifts being connectible with said regulating elements and said control element, respectively via intervention of said changeover valve, in such a way that one of said lifting cylinders can be controlled as to operation while the other lifting cylinder can be regulated as to function, and vice versa.