3877 Tapered Roller Bearing ConeOne New Aftermarket Replacement Tapered Roller Bearing Cone Fits John Deere, Fits Case IH, and Fits Caterpillar Equipment This tapered roller bearing cone (inner ring assembly) is a direct replacement for the Timken 3877 and equivalent industry standard part. The cone pairs with a matching cup (outer ring, sold separately cup number 3820) to form a complete single row tapered roller bearing capable of handling both radial and axial loads. Commonly