Shortly after I got my tractor the salesman at the Deere dealership was telling me if I wanted more power that they could turn up the injection pump and pto dyno my tractor to get the power level up to the equivalent of a 4720. Is there any difference between the 2 engines other than tuning of the injection pumps of the 2007 model year? If there isn't then I may have my neighbor that's a diesel mechanic make some performance adjustments rather than looking at getting a higher hp tractor (I really like my tractor just sometimes wish I had more hp when doing some of my tasks).
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