MY JOHN DEERE LX 280 WITH A 42 INCH DECK HAS A SEVER VIBRATION WHEN I ENGAGE THE ELECTRIC PTO.THE BLADES,SPINDLES AND BELTS ARE NEW THE DECK IS NOT ROTTED.HAS ANY ONE SEEN A ELECTRIC PTO CAUSE THIS PROBLEM OR AM I LOOKING IN THE WRONG SPOT.ALL OF THE SPRINGS ARE IN GOOD SHAPE ALSO. HELP!!!!!!