Changing Hammers in a Pin and Plate Style Hammermill
Using your lubricant (diesel oil, WD40, or similar lubricating oil) lubricate the hammer retaining rods where they pass through the rotor plates. (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.