Abstract: An agricultural machine includes a pick-up device with teeth and points, and a guiding device with a lower front end, a rear part and an intermediate part situated above the pick-up device and movable relative to the latter about a rotation center, via a displacement device movable in a first, respectively a second position and including first and second connecting devices which enable the guiding device to pivot about a first, respectively a second rotation center. The first and second connecting devices are geometrically and/or elastically configured so that in the first position, the lower front end is greatly raised above the ground and the intermediate part is brought close to the points, and that in the second position the lower front end is brought greatly close to the ground and the intermediate part and the rear part are distanced from the points.

Abstract: The invention is a combination of a short ground sensor arm mounted close to the cutter bar and a longer rod mounted towards the rear of the header. The short front sensor and long rear sensor are connected by a linkage which translates motions from either sensor to the other sensor. A second linkage translates the motions of both sensors rearward to a protected area under the header which contains the potentiometer. This configuration transmits useful ground position signals to the header height controller in both low and high cutting heights. The invention advantageously reduces the likelihood of damage to the short front sensor when the machine is reversed since the longer rear sensor arm pulls the shorter forward sensor arm up by means of the linkage to a position where damage is unlikely.