I have the same issue, only have 33 hours on mine. Dealer says John Deere is aware and should have the fix by end of October. something about a washer needs to be added to shifter, hope this is all it takes really frustrating that John Deere has not already fixed the problem.
I only have 44 hours on my new 550 S4 and the transmission and the clutch both have had to be replaced!!! I have only had the gator since Oct.31 it's been in the shop for over a month of that time, over three weeks just for the transmission! Because there was no rush on fixing something under warranty!
Now it is back in the shop, because the transmission is bad again!!! I am very disappointed in the product, has any one else had problems like this with their 550 S4? Because at this point I am really considering doing something about it?
At this point I am waiting on John deer to see what they are going to do!!!