How similar YM1700 & YM1700B are to other manufactured models. Especially if there are interchangeable parts between Yanmar and Ford, etc. Would appreciate anyone who has more information on this.
Here's the short version. Hopefully a dealer with broader knowledge will supplement this:
Yanmar is a first-tier Japanese company like Toyota. They don't generally build for others except as I describe below.
Yanmar (and also Kubota) opened their own dealerships in the US in the early to mid 70's.
Take a look at the US Yanmar brochures referenced from my sig, below. Your YM1700B is near identical to the US-version YM195 in that brochure. (B is a later version of YM1700 with fancier trim. It was sold in Japan but the US models never got the 'B' trim upgrade.) Another difference in the US models of the 1970's is that they kept the green paint when the Japanese home market models switched over to red. So my 1981 YM240 is newer than any YM2000 (1977-1979)(its Japanese twin) even though it is in colors that Yanmar quit using for their home market in about 1976. Confused yet?
In the late 70's Yanmar contracted to build Deere's compact tractor line but those aren't generally relabeled Japanese Yanmars, they are unique models with little crossover. Ok, a couple of the later Deeres are twins - but not the majority of them. I think Yanmar maintained Yanmar-USA dealers up into the late 80's selling in competition to the Yanmar-built Deeres, then they ended their own presence here. Yanmar-USA now sells construction equipment etc but not farm tractors. They still support the old USA Yanmars like mine.
Then a couple of years ago the contract with Deere ended. Yanmar is now building tractors marketed as Cub Cadet (an American brand). Yanmar-Japan is also building a crawler for the specialized US vineyard business, but I think that is the only farm item. I think support comes from a separate Japan-controlled network and not from Yanmar-USA. (Somebody please fill in here if you have the details!)
So in summary there is no relationship to Ford. Some gray market imports are Yanmars relabeled Zen-Noh because the were distributed to Japanese farmers through a co-op, but that and the contract tractors for Deere and Cub should be the only instances of relabeled Yanmars.