I need help determining why my John Deere 155c will not engage the PTO. I have changed out the PTO switch and the PTO clutch. I believe the problem is in the wiring/electrical.

Green Tractor, March 2010

Check the harness that connects to your clutch, Chances are they are crimped on and can break & cut through due to vibration & heat due to the clutch engaging. "If you do not hear the clutch click on when you pull the switch out with the key on , that's a pretty good bet. You do not have to have the mower running to test this. Good luck

Mark, September 2010