JD 50d. Hard turn

I have a 2012 John Deere 50D. Every thing runs and operates perfectly except for running the tracks in opposite directions. Both forward or both reverse it is very strong. Every once in a while it will turn with full strength, but most of the time it is a real pain in the ass. I’m positive terrain is not the culprit and that my track are free and clear. Thanks for the help!!