Changing Hammers in a Pin and Plate Style Hammermill
(note) Do not spare the oil here. Using an 18″ to 24″ long pipe wrench, rotate all of the hammer retaining rods three or four full turns until they are turning freely in the mill. (note) Rotate all the rods before trying to remove any of them. The first step to change the hammers is to remove the hammer rods.