Rubber tires allow for wheel slippage under load, and some wheel slippage is good for efficiency.
Wheel slippage can mean the difference between being stuck plowing in 2nd gear on steel, and plowing in 3rd gear on rubber. She just doesn't quite have enough power to pull in 3rd on steel, but the slippage of the rubber tires lets the tractor wind up and keep moving in 3rd.
Let's say 2nd gear is rated 2MPH, and 3rd is rated 3MPH. With steel you're doing 2MPH in 2nd gear, period. On rubber you might be doing 2.75MPH instead of 3MPH, but it's still .75MPH faster.
Even though the tractor is spinning a little bit on the rubber tires, it's still moving through the field faster and getting more work done.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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