I have a question if anyone can help me identify the years they made the green tractors it would help my curiosity as to the years made thanks for any info on this tractor and I will see if I can get a couple pics of it on here.
Yanmar and Kubota arrived in the US early 70's and were neck and neck competitors until Yanmar contracted to build Deere's under 50 hp models. Yanmar sales lessened after the early 80's and I think ended around 1988 (?) as the Deere versions increased.
Yanmars were green at first. As the early models were retired, early 80's, replacement models were red. The final year of green, around 1981, is easy to spot: they switched from an air cleaner under the hood to a 'Donaldson' type air filter outside the left side of the hood with a snorkel on it.
I posted the YM240 showroom sales brochure here since I own one. It was one of the last green Yanmars, a 24 hp 2-cylinder that is a mix of simple, crude, and elegantly simple so any farmer anywhere in the world can keep it running with little more than a screwdriver and a crescent wrench. Literally.
http://www.tractorbynet.com/forums/yanmar/288670-ym240-showroom-brochure.html
In Japan, the same tractor was called YM2000 and its first series was green. Then they switched to red when they went to new sheet metal - a front-hinged hood - while the US YM240 stayed green after this upgrade until the end of production, 1981.
Here's an old thread I posted comparing my 24 hp YM240 with my smaller, later (1983) YM186D that has one huge advantage: Powershift transmission. 3 ranges then in each range an, in effect, automatic transmission that can be shifted up or down under full load. After the hydraulic clutches engage (instantly) it's a straight mechanical gear train, no torque converter. I love the little tractor, in fact when I found another with loader and power steering I replaced the first one, (
photo) and now use the larger green YM240 only for the backhoe and rarely to lift something with its larger loader. All three look thrashed, abused, and run like new. I had the first YM186D dyno tested. It exceeded its 18 rated horsepower ... 30 years after it was new. This illustrates why they have such a loyal following.
YM240 / YM186D comparison:
http://www.tractorbynet.com/forums/yanmar/170137-mowing-big-twin-ym240-vs.html