Paul,
The only Yanmar (or Yanmar-based) machine in the JD line now is the 790, if Yanmar even still makes it. But, Shibaura did make some of the Ford/NH machines, and also produced some of Yanmar's tractors for a while - so the 790 could be a Shibaura machine in some way, since I think Shibaura also did some of the 70 series production for Deere (670, 770). But, I really don't know what Shibaura manufactures for US Tractor Makers at this time... as the Boomers are "Made in USA", as are 4000-series John Deere machines.
Also, if you're interested, Shibaura makes equipment for MTD, Honda, and Stihl.
<font color=blue>>></font color=blue>Muhammad
<font color=blue>Forum Master</font color=blue>