Purchased a used Bearcat chipper and installed it onto our BX23. All hooked up and into the woods we go to try it out! Crank up the RPM's, engage the PTO and success. Chipper is alive. I get off the seat to give it a try and the machine shuts down. Back on, start it up, engage PTO, put in neutral, brake on, get off, still shuts down. The only way to try the chipper was to have my wife sit in the seat! Is there something I am doing wrong?