John, the Deere's didn't require you to hold the button in either. Once the tractor started moving, you could let up.
The one my Dad had must have been malfunctioning. I had to hold the button in or the PTO would stop. I tried not to ever back up if I could help it. He put over 900 hours on it before he passed.
Yes, it was malfunctioning.
"Forget pounds and ounces, I'm figuring displacement!"
If we accept that: MBG(+)FGSF(=)HBG(F1) And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1) Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT? PB answer: It depends.