8561, my B7500HST does the same as your tractor. There was a post about this quite long ago. I forget who posted it, but they said it is perfectly normal. The explanation of what was happening was clear - I simply can't remember what it was /forums/images/graemlins/blush.gif
Regarding the jerking, the Kubota is smooth. It can be moved very slowly on the first move after startup. SSince it is garage-kept, it is usually driven outside slowly soon after it starts (garage is attached to house @ family room - diesel smoke isn't appreciated by all parties). I have a Ford 1210HST that has jerked ever since I bought it (used) about 10 years ago. The first teensy bit of travel it does after a cold start is a short lurch. It doesn't seem to make any difference how long I allow it to warm up. When it comes time to move it, I can gently press the hydro pedal more and more until it lurches forward or backward. After the initial lurch, it will go all day without doing it again.............chim
