Device regulating the hydraulic power supplied by the variable capacity volumetric hydraulic pump feeding a hydraulic system comprising: - a variable capacity volumetric hydraulic pump capable of being driven by a thermal - a control device connected to the said pump and which is capable of varying the maximum value of the torque consumed by the pump according to a set value; - means of control capable of addressing a set value to the control device; - means of evaluating the value of the instantaneous real torque consumed by the pump, characterized in that the regulating device comprises: - means (26, 28) of evaluating a maximum theoretical torque value consumed by the pump according to a set value applied to the control device; - means of calculating a ratio between the real instantaneous torque value and the maximum theoretical torque value; - means of memorizing at least one reference value; - means (24, 26) of modifying the set value to tend to bring the said ratio towards or make it equal to the reference value; - with the set value being modified by one or several increments whose values correspond to a fraction of the maximum torque that the pump can consume, with the said increments applied according to time intervals, the ratio between the value of an increment and its associated time interval being less than a predetermined value. - a variable capacity volumetric hydraulic pump capable of being driven by a thermal - a control device connected to the said pump and which is capable of varying the maximum value of the torque consumed by the pump according to a set value; - means of control capable of addressing a set value to the control device; - means of evaluating the value of the instantaneous real torque consumed by the pump, characterized in that the regulating device comprises: - means (26, 28) of evaluating a maximum theoretical torque value consumed by the pump according to a set value applied to the control device; - means of calculating a ratio between the real instantaneous torque value and the maximum theoretical torque value; - means of memorizing at least one reference value; - means (24, 26) of modifying the set value to tend to bring the said ratio towards or make it equal to the reference value; - with the set value being modified by one or several increments whose values correspond to a fraction of the maximum torque that the pump can consume, with the said increments applied according to time intervals, the ratio between the value of an increment and its associated time interval being less than a predetermined value. - means (26, 28) of evaluating a maximum theoretical torque value consumed by the pump according to a set value applied to the control device; - means of calculating a ratio between the real instantaneous torque value and the maximum theoretical torque value; - means of memorizing at least one reference value; - means (24, 26) of modifying the set value to tend to bring the said ratio towards or make it equal to the reference value; - with the set value being modified by one or several increments whose values correspond to a fraction of the maximum torque that the pump can consume, with the said increments applied according to time intervals, the ratio between the value of an increment and its associated time interval being less than a predetermined value.