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I don't have a JD, but on my unit there's a pin on the back you pull out and lock into place that disengages the trans.... maybe yours has something similar
I will second the fact that there should be some sort of a little lever to disengage the drive.
Also
1. NOT recommended to move it without disengaging.
2. On my new Cub Cadet, it's not recommended to move it very far even after disengaging. Don't know how common that is.
You might check out mytractorforum.com -- they're like the fte of tractors. They have numerous sections to discuss pretty much any small to mid size tractor. JD is well represented.
Ditto what the others have said. It'll have a hydro dump valve somewhere. Can vary from a "pull-out" type of rod in the rear frame above/around the trailer hitch to a lever/**** under the seat of just between the legs in front of the seat to a hidden lever up under the fender. Some older JDs kind of hid the dump valve. Most newer tractors have them in more visible places.
I am not directly familiar with this model, but all hydros, as far as I know, have release valves on them somewhere as every manufacturer recognizes that from time to time they must be moved under other than their own power.