Pump, Water (W/ ENGINE SN 278123 > ). PART NO: A-AR69709. This water pump is completely new, from the seal to the housing. It Includes a pulley and fits the John Deere Tractor 4030 (with Engine SN 278123 > ). (NOTE: Replaces AR69709-R) Casting # R52009. . MODELS: John Deere TRACTOR: 4030 (W/ ENGINE SN 278123 > ).