Posted by Bill(Wis) on September 14, 2012 at 07:43:39 from (184.75.123.14):
In Reply to: Question........... posted by Goose on September 14, 2012 at 06:36:33:
DeltaRed is correct. "After years of testing" John Deere released its first diesel tractor in 1949, the Model R.It had a live independent PTO, live hydraulics (PowrTrol) and was the most fuel efficient tractor tested up to that date at Nebraska. It had a lot of problems in spite of "years of testing". The engine was basically an upgraded Model D conversion with thermo-siphon cooling (no water pump) which resulted in overheating and cylinder head cracks. It had no center main bearing on the crank and would vibrate when used as a stationary power plant. This was caused by crankshaft flexing and subsequent failure if used in that role a lot. The 2 45degree bevel grears on the PTO were too small and would fail. "The tractor was, however, very good at being a tractor" and was used extensively for pulling large pieces of equipment. Most of its problems were resolved in the following models 80, 820 and 830. Also, reportedly, the R engine had a habit of running backward which was later corrected with a cam mod.
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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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