That's all well and good, but the fact is on my 737, if the pto is running, I cannot press the reverse handle control fully to reverse the tractor. It simply won't press down fully to actuate it, it's physically blocked from doing so. It does not pop the pto out, turning the pto off. If the pto is shut off, then I can press the handle fully and go in reverse. So either the 737 isn't exactly like the 853 in that video, or my system isn't working exactly how it once did. That's possible, things often get sticky, less smooth, and harder to operate over time, so who knows.