Abstract: The device for regulating ground clearance of a working unit of an agricultural machine includes a position sensor (11) which detects a position of the working unit (2) relative to the machine and generates a working unit position signal; a pressure sensor (10) which generates a control element pressure signal; a ground clearance sensor (9) which issues a corresponding ground clearance sensor output signal in a contactless manner; and a control device (7) for operating the control element to set the ground clearance according to the ground clearance sensor output signal alone in a first range closest to the ground, according to the working unit position signal alone in a second range furthest from the ground and according to a combined signal in a third transitional range between the first and second ranges, which is equal to a mixture of the ground clearance sensor output signal and the working unit position signal and which varies continuously from the first range to the second range.

Abstract: An agricultural pulling machine such as a tractor or construction machine vehicle with an attachment comprises a mounting device for coupling the attachment to the agricultural machine and a device for active damping of pitch vibrations of the vehicle. The device for active damping including a power lift for moving the mounting device and a regulating device which controls movement of the mounting device in the region of its lifting position in dependence upon the vibrations of the vehicle during travel, and a force sensor producing signals to which the regulating device responds. The mounting device includes a lever, a housing of the vehicle and a side guiding member connecting the lever with the housing of the vehicle.