I cannot seem to get the PTO to operate properly on my new Farmtrac 300 DTC. I use a 5 foot finish mower with no problem, but when I hook up to a 5 foot rotary cutter it engages like two freight trains colliding, whether in manual or independent mode. It shears the bolt pin on the cutter three out of five times it is engaged, especially when engaging it with the clutch. The cutter works smoothly on another tractor. Does anyone have any idea what I am doing wrong?