Having trouble with the following mod: John Deere DN345 Spreader

Love this spreader. Has a good capacity and working width. My only issue is I can’t unload it directly into productions or silos that hold lime or fert. I am forced to unload it in an open area which normally isn’t that big of a deal but when 18 pallets spawn that I can’t lift it becomes very annoying. Anyone know what may be the issue? I was thinking the height of the spreader may be too high to trigger the unloading function on the productions. Anyone have a work around for a problem like that?