Abstract: The shredder apparatus has all high wear regions of the stationary parts protected by readily replaceable liners. A funnel fed arrangement into the shredder chamber prevents jams of material being fed to machine and build up of foil and dirt, etc., which can also cause jams. Wind vane bolts are recessed into the rotor and wind vanes are located on the lower wear side thereof and cooperating bolts are located on the low wear or protected side of the vane. A replaceable dummy wear liner is provided under the shredder screen to protect the frame and is readily replaceable and removable by lifting from its craddle. The shred heads are comprised of two parts, a yoke and a replaceable head portion to extend life of each head and provide ease of replacement.