Hi, How is it possible to maintain a constant PTO speed and switch gears from fwd to reverse. I want to back up to my pond to mow but every time I stop it disengages the pto. Is this normal for a simple 2wd L185. Probably late 80’s w 900 hrs. I run tractors all the time at work but there they are electric clutches and hydro trans. Easy pleasey. Any advice would be greatly appreciated!! Thank you!!