the gear is OEM part ,supply for Massey Ferguson tractor part refer Perkins 4.40 4.236 and Pderkins 4.248 ... diesel crankshaft gear the gear is OEM part ,supply for Perkins4.41 Perkins 4.236 and Perkins 4 ... .248 diesel crankshaft gear, and Massey Ferguson tractor part , the Perkins OEM number is 31171683.the gear surface is grinding ,good ...