Are you talking about the divetor valve? I have mine located in the fender behind your right heel, works great. I haven't seen a 2520/2570 with a deck so I am not sure what the setup should be, we use the X series for mowing and the CUTS do mainly loader work and some backhoe jobs. Frigin amazing tractors, I am hard pressed to put a buck an hour through the 2520, granted we hardly ever run them over 2,000 rpm, today was an excaption, I have two of the JD PTO generators as we sometimes need electrical power on a site for welding or cutting with the mini grinder (steel culverts).I don't believe it will be necessary, I mowed the waterways tonight. Figured I might as well jump right in and see what it would do. There is one place that I tensed up a little but for the most part tractor is pretty stable. I am very impressed with the quality of cut and the overall manuverbility of the 2520. One thing I am not impressed with is the mower cutting height setup. You would think John Deere would have come up with something better than that. To make things worse the talented individual who drilled/cut the hole in the fender put it off location and the cable rubs. I'll take it off this winter and correct the problem.