Abstract: The device is mounted in an agricultural machine comprising two links for drawing an implement, a lifter member and a central control unit for controlling the member. The device comprises: two horizontal bars carried in the form of brackets from the chassis of the machine; and four resistive elements deposited on flat faces of the bars symmetrically with respect to a neutral axis defined in this latter, made of a material having an electrical resistance proportional to the deformations to which they are subject and connected in a Wheatstone bridge circuit in such a way such that this arrangement generates an electrical signal proportional to the imbalance of the bridge caused by the deformations to which the elements are subjected, and which are transmitted from the traction force on the implement.

Abstract: A transmission for an agricultural tractor featuring a large number of gears and comprising a first six-gear stage and a second reverse-reduction stage having three forward and one reverse speed ranges. The first stage comprises a pair of drive shafts selectively connectable to an input shaft via respective hydraulic clutches and to an output shaft via constant mesh gears respectively defining the odd and even number gears and engaging the output shaft via sliding couplings controlled by three-position hydraulic actuators. The actuators are operated by respective pairs of on-off solenoid valves supplied via a proportional-response solenoid valve, further proportional-response solenoid valves controlling engagement and release of the aforementioned clutches. All the aforementioned solenoid valves are controlled by an electronic control unit for appropriately controlling engagement of the clutches and actuators as a function of the actual service conditions of the tractor.