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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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