A HYDRAULIC DEVICE WITH A VARIABLE LOAD CONTROL SYSTEM IN, where the hydraulic device comprises a tubular housing, wherein a rod is attached to a piston separating an upper and a lower area filled with hydraulic fluid so that, as the piston and rod move, the rod and piston travel together relative to an axis inside the tubular housing, displacing the hydraulic fluid inside the tubular housing from one area to the other, thus changing volumes inside the areas; wherein the piston is moving in the hydraulic device towards a position of maximum compression progressively reducing the volume of the lower area; the hydraulic device further adopting a rest position when it is at maximum extension; wherein: - the system comprises a modular mechanism located inside the lower area of the tubular housing, sealed with a lid at the bottom; - the upper area and the lower area are connected through a series of through perforations in the piston; - the modular mechanism comprises an upper tubular head wherein a lower tube is fitted and guided, with an annular support fitted on its bottom end, the upper tubular head having axial mobility when travels down towards the position of maximum compression in the hydraulic device, and when travels up in an opposite direction towards a position of maximum extension of the hydraulic device; - the upper tubular head has a series of through slots on its walls that connect an inner chamber, that is enclosed by the inner sides of the lower tube and the upper tubular head, with an outer annular chamber that is defined by the inner side of the tubular housing and the outer sides of the upper tubular head and the lower tube; the hydraulic device being characterized in that: - the annular support has a series of through holes that connect the inner chamber with the outer annular chamber, so that the passage of the hydraulic fluid between the outer annular chamber and the inner chamber is progressively reduced from a situation of maximum cross-section flow when the shock absorber is in the position of maximum extension, to a situation of no cross-section flow when the shock absorber is in the position of maximum compression and the full length of the through slots are facing the lower tube, the flow being restricted to the cross-section passage of the through holes. - the system comprises a modular mechanism located inside the lower area of the tubular housing, sealed with a lid at the bottom; - the upper area and the lower area are connected through a series of through perforations in the piston; - the modular mechanism comprises an upper tubular head wherein a lower tube is fitted and guided, with an annular support fitted on its bottom end, the upper tubular head having axial mobility when travels down towards the position of maximum compression in the hydraulic device, and when travels up in an opposite direction towards a position of maximum extension of the hydraulic device; - the upper tubular head has a series of through slots on its walls that connect an inner chamber, that is enclosed by the inner sides of the lower tube and the upper tubular head, with an outer annular chamber that is defined by the inner side of the tubular housing and the outer sides of the upper tubular head and the lower tube; the hydraulic device being characterized in that: - the annular support has a series of through holes that connect the inner chamber with the outer annular chamber, - the annular support has a series of through holes that connect the inner chamber with the outer annular chamber,