I have a 1989 model 170 riding lawn mower. The lever that turn on the blades I can't turn it off.
Make: John Deere
Model: 170 38'' deck
I've tried wiggling the lever around. Of course I can't start it with the blade being on.
The Pto is operated via a switch. If the switch is stuck in the ON position then you will need to replace the switch. Once they stick they will continue to do so.
Owner of outdoor power equipment business, repairing all makes and models.