Gruendler Hog Hammer Mill, Model 724, 350 HP. used. Manufacturer: Gruendler Crusher Pulverizer Co; Gruendler Hog Hammer Mill, Model 724, 350 HP Used Gruendler hog hammer mill, model 724 Wood Hog, approximately 39" x 74" feed opening, 24" diameter rotor with swinging hammers with hard surfacing, split top cov...