It is actually a Terex Recycler. It has a John Deere PowerTech 12.5 liter. We recycle pallets and brush and make mulch. We also do hardwood bark for the good mulch. At that time I was grinding pallets. usually you can hear the steel start to chink inside the chamber, but that was a one shot deal! I hit all the reverse switches on the remote, but it was too late. Problem we are having is that Terex no longer makes these so most parts are not available. We had to take the bit holder in and some crescent bars in and have them copied. Three days earlier I had a 16 pound sledge go through. Fixed that in an hour.