1760M Hydrostat trans. surging

[bglegal1]

2019 1760M Cab. 215 hours. Last weekend using the tractor to move some brush/logs around, after 45 minutes or so, the transmission started surging in reverse. Forward was completely normal. Surging was not too bad, but noticeable for sure. No loss of engine RPM's. Was able to finish what I was doing with no problem other than the surging in reverse. Mostly nothing on the loader in reverse. I'm at a loss as to why it only happens in reverse. All scheduled maintenance has been timely done. Before I start changing filters, fluid, etc. anyone else experienced this? Any suggested fix or areas to troubleshoot? Thanks

 

[oldnslo]

Is the hydrostatic trans electronic controlled on that model? If yes I would suspect a problem in the electronic control circuit more than the hydrostatic trans especially since operates fine going forward.

Reason for this thought is that the Main components of HST are the same for both forward and reverse.