Crankshaft, 4-cylinder compatible with John Deere models 1640, 1830, 1840, 2020, 2030, 2040, 2040S, 2120, 2130, 2140, 219D, 239D, 2450, 2650, 2850. Replaces part numbers: AT18030, RE48748. Ensure your equipment runs smoothly with this crankshaft, 4-cylinder.