In our case the D21 Series II would outpull the 1206. My brother pulled his 21 against me on grandpa's 1206 and handed it to me more than once. Now the 1256 with it's Schweitzer turbo and 407 cu inches vs the Series II 21 that was close. For longevity the IH would beat the Allis. The A-C had weak connecting rod design and quite a few engine blocks were windowed. The bull gears were also known to fail on the D21's. IH spent a ton and a mean a ton of hours testing the 806/1206's before they were released. They did not want a repeat of the 560's failures and history will show of some well cared 06's and 56's have accumulated incrediable number of hours before needing repair. I have a neighbor that has a 1026 hydro with a DT407 engine going in for it's first overhaul with 34,000 hours. Wow!
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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