JB: I was farming in the 1960's as North America switched on mass to diesel tractors. Yes I know there were diesels around before that, but I'm talking about the 80% that until then were using gas tractors. What a blessing these new diesels were in the 1960's, especially on jobs where controlled steady speed was necessary. Jobs like applying chemicals, seeding, and pto work. Most of these jobs never worked the tractor to it's max, but it did have the ability to maintain steady rpm. Most of the jobs I'm talking about never generated a lot of black smoke even by the tractors that would belch black smoke on demand if load got heavy enough. Farmall 06, 56, 66 and 86 series tractors were not bad on black smoke, if job was within rated hp. You start pushing them over rated hp and yes they would smoke some, but would maintain rpm. This Deere and the CaseIH I drove a while back were not working to capacity. I have driven FordNH and Kubota as well, and same thing. In my opinion a 100 hp tractor should go along a hard road at 8 mph with 10 ton behind it on wagons, no more than 15% grade anywhere. The tach should not vary more than 100 rpm. I'm quite sure my 656 would do if and vary no more than that. My 1066 you would never see the tach move. These new 100 hp tractors are dropping 200-500 rpm on work that shouldn't create a mere sweat for them. Just last year I watched a guy spreading fertilizer with one of those large tandem axle spreaders. These are the spreaders everyone rents from the fert company and they all pull them with a 100 hp tractors. This guy in question was pulling the spreader with a fully restored Farmall Super M. Man what a pretty picture, and that Super M was hiking along in 3rd or 4th gear to, and the spreader was full when I saw him.
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