The 66 series is basically a 56 series with the DT400 series engine in it... same shift pattern, same basic layout, etc.
Our 1256 went through its first 30 years as a field tractor, racking up 6500 hours for its first owner - all trouble free and with good maintenance. When we bought it a Farmhand 235 loader was installed and that was the sweetest shifting loader tractor I had ever run up to that point. Easy, right gear speeds, and just all-around good. After 3000 hours of hard use on the loader it was getting tired, lots of blow-by and sloppy shifting and starting to jump out of gear now and then. Finally traded it off at that point with 9500 hours on it with minimal repairs and normal maintenance. I believe we put rod and main bearings in at 7500 hours or so.
Dad's 1086 is another one that has served faithfully for nearly 10,000 hours now with minimal repair and normal maintenance. Sure, the shifting isn't great compared with a newer tractor, but it's a great field tractor and gets used for just about everything from the field sprayer, field cultivator, haybine, stackmover, pull-type combine, snowblower, etc. Of course it's been retired from some of those jobs now as we have a self-propelled combine and a MFWD tractor for the snowblower - but it would still perform all those tasks just fine if the need should arise.
My favorite series of IH? The letter series. Simple and dependable.
If I need to choose a big IH tractor it would be the 806 and 1206. The D361 and DT361 engines seemed to be nearly indestructable. Our 806 had a total of around 26,000 hours on it when it was traded off. One engine overhaul and one clutch job, original TA. Just a darn good (loud) tractor.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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