Self-propelling agricultural machine with two-part cutting mechanism trough

A self-propelling agricultural machine, comprising a cutter bar;

• a cutting mechanism trough including a first stationary part and a second part which carries said cutter bar and is displaceable relative to said first stationary part to adjust a distance between said parts;
• a drawing-in reel associated with said cutting mechanism trough and arranged displaceably relative to said cutting mechanism trough so that an average distance from said drawing-in reel to said cutter bar can be fixed;
• an electromagnetically actuated cylinder-piston unit operative for displacing said drawing-in reel;
• means for determining a relative position of said second part relative to said first part of said cutting mechanism trough, said cylinder-piston unit having electromagnetic valves actuated in dependence on a relative position of said second part relative to said first part determined by said determining means so that an average height of said reel corresponding to the relative position of said second part relative to said first part determined by said determining means is provided for maintaining said average distance of said reel relative to said cutter bar.