An old saying of maybe 50-60 years ago was: "A diesel will really get down and lug". This was a quite accurate statement. And it was considered an important quality. Back then, tractors only had 4, 5 or 6 rather widely spaced speeds forward. No 16 speed powershifts or CVTs. Around here, it is common to find nice level loamy fields with frquent red clay knolls. Moldboard plowing was the standard back then and plowing along in, say third gear, you encounter one of those clay knolls 50-100 or so feet in length. If your tractor doesn't have good "lugging ability" you will find yourself stopping, shifting down, and then starting, only to find yourself stopping a few feet down the furrow, shifting back up and starting up again. Across a 40 acre field, that could happen 4 or 5 times. So, what better than to have a tractor that can lug through that little tough spot and then continue on. Look at Nebraska Tractor Test Lab test # 594 and 605. You will see the comparison between the John Deere 720 gas powered tractor and the 720 Diesel. At 54% of rated rpm, the lowest rpm tested, the diesel was producing a whopping 12% more torque than its gasoline counterpart. In fact, all the way down the scale, the diesel was making more torque than the gasser. Same was true of the Oliver Super 88 until the very last end when the diesel lagged a little behind the gasser. But, in the working rpm range, the diesel beat the gasser in torque. That was important and sold a lot of diesels, to the point that gassers simply disappeared
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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