JD 757 only runs and moves when the PTO blades are engaged.

[rhuether]

I have a 2007 JD 757. Bought it earlier this summer with only 660 hrs. on it. Been running great, then a week ago it just stopped running cutting my yard. My son helped me trouble shoot and this is what we found. Starts up fine and continues running when i release the parking brake. AS SOON AS I engage the handles to move it, it cuts off. Either arm and it will cut off. BUT, if I engage the PTO blades, it will move. as soon as the PTO is shut off, if the handles are pulled in, it cuts off. We checked all the wires seat switch, replaced the PTO switch. same results, no change. Even tried bypassing the seat safety switch, no change. I'm stumped!

 

[Auto Doc's]

Remove the right console cover and locate the plug-in "box diode". Remove it and see if it all works them. The seat switch is also common to wear the harness and short to the seat frame.