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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