I have a 2012 M7040HDC. The 4WD lever operates fine and all indications are that it is out of 4WD, but it never disengages. I use the loader to lift up the front wheels and they don't turn freely. I can get one to turn and it rotates the other tire in the opposite direction with alot of resistance. I have looked at the linkage and don't see anything bent or worn.