I have a tub grinder we have been using to grind hay and grain works like it should. I just had the belt respliced and checked all the bearings while I had it out. I have a 2.5 in screen and a 3.5 but always use the 2.5. Has variable speed on the tub rotation and forward and reverse. Hammers are like new. Call or text 620-654-67foureight.