The Hydro – Propelled EHO grain extractor has a double roll system that produces a bag passing through those rolls at the same time that the machine is unloading the grains from the bag. The used bag stays extended on the ground. The classification hydro-propelled is because the movement or propulsion of the machine is made by the hydraulic system and not for the pulling of the tractor. An advantage of this system is that is not necessary to unroll the bag in case the operator needs to stop unloading. In any moment of the unloading process this double-roll machine can be stopped, cut the bag and release the machine producing time savings.