Patent ID: 7603856

Claim:
A heavy construction machine comprising: a work implement including one or several arms, articulated in relation to a chassis of the machine; a unit with at least one hydraulic jack for moving the work implement in relation to the chassis; and a hydraulic circuit feeding the jacks as per commands sent by a hydraulic manipulator and wherein the machine is capable of working in two different modes, a lifting mode and a loading mode in which the course of the jack can be made free when the manipulator is in a predetermined position corresponding to a position known as the “floating command”, and with hydraulic components configured to make the position known as the floating command of the manipulator inactive when the machine is in a lifting mode, configured such that when the manipulator is in the position known as the floating command, it generates excess pressure in the hydraulic circuit command portion and, when the machine is working in a lifting mode, a pressure reducer is activated in order to limit the effect of the excess pressure.