Not sure of year model, but Deere made this model 6410 in 1998-2001 Serial # L06410P302418. The best I can describe is, sounds like the hydraulic fluid continuously moving. Steering gets eratic. If you run it long enough, hydraulic oil templight comes on. What I have done so far is, changed out the priority valve and spring. Was told this changeout would resove the issue but it persists. I appreciate any suggestions as I have not expeienced this starnge issue with other JD tractors.
Take the scv stack apart probably has a crack in the center housing. Load sense and work pressure for lack of a better term are probably intermingaling.
Will take a look, thanks