I never saw any evidence of Deere tractors using excess fuel due to closed center pumps. Deere tractors with PowerShift transmissions did cause some loss. One example, to make a fair comparison - here are two Deere tractors that are almost identical except one has an open center pump and the other closed center. Same engines, same basic tractors. The closed center tractor actually tested with better efficiency, not worse.
Deere 820 with 152 diesel - best fuel - 14.2 horsepower hours per gallon. Open center pump.
Deere 1010 with 152 diesel - best fuel - 15.4 horsepower hours per gallon. Closed center pump.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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