I had, until recently, an 855D with under 100 hours that always had a clutch problems since I bought it new. The clutch and belt was replaced twice by my dealer and always seemed to fail to disengage within about 15 hours of use. This Gator was my 5th over the last 10 years. I still have an TX that performs as it should, but decided to trade the 855D for a competitor's UTV. Interestingly, my JD dealer's Service Department Manager has told me he wished JD would get out of the UTV business as too often (except the Traditional Series Gators) the XUV's end up back in the dealership's service department with clutch and some other component problems.
I believe JD knows they have a problem as they agreed to pick up 2/3's of the cost of the 2nd clutch/belt because I was out of warranty. Note, also, idle speed adjustments were made to see if that would have any impact on the clutch releasing to effect...it didn't.
No flaming on my comments, please. I just need equipment that works in the field for me and my field hands and when running a farming operation, there is little time available to deal with equipment that I cannot rely upon.