I have a brand new MX6000 and while poking around the belly, I found this bolt that has a free floating pin in the middle. It's not painted grey, so I doubt it was installed by the factory. It's located on the centerline, just forward of the transmission. Forward of this bolt, the front drive shaft emerges from the casting and goes forward. My machine is equipped with the factory third function valve and three remotes, FWIW.