I think it's because the T80 (rubber track crawler) is the only ag tractor they presently import. See Yanmar News, November 2005. And I think this is only sold in the wine growing regions of the West Coast.
They won't support grays, and it's been 18 (?) years since Yanmar-USA last sold an ag tractor. They continue to stock parts for US models but they don't seem to promote that.
My local Deere dealer (West Cal, Santa Rosa) said they remain a Yanmar Parts dealer and can order anything for the US Yanmars from Yanmar America in Buffalo Grove (Chicago). I have found the Internet parts dealers more convenient.
"I think it's because the T80 (rubber track crawler) is the only ag tractor they presently import. See Yanmar News, November 2005. And I think this is only sold in the wine growing regions of the West Coast."