The 87 and 187 were two-way plows. The 92 and 192 were one-way. The 87 and 92 were the original plows that came out in 1939 when the tractor was introduced. The 187 and 192 were the later, improved versions. The main differences were that the later plows were stronger than the earlier versions. Virtually every part was beefed up. There was probably some overlap on production dates. The 187 and 192 were built from 1941, while the 87 and 92 may have been built into 1942.
I'd have to go through the manuals to see specific differences.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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