TRACKER HYDRAULIC ASSISTANCE DEVICE FOR A SLAVE CRAFT

The invention relates to a hydraulic assistance device comprising: a hydraulic machine () capable of driving a wheel (W) of the craft; a variable displacement pump () comprising a double-acting actuator () defining two control chambers (12) for hydraulically controlling the capacity of said pump (); two supply lines (40) that connect the hydraulic machine () and the variable displacement pump () in order to form a closed circuit, characterised in that the device further comprises: two control lines (80), each being respectively drawn from one of the two supply lines (40) and being configured to respectively supply one of the two control chambers (12); two electrically calibratable pressure limiters (90) respectively disposed on the two control lines (80).