Remanufactured Parts are actually broken up into three further categories. Remanufactured, Reconditioned and Rebuilt. Fully remanufactured parts are fully rebuilt with OEM components, dynamically tested and come complete with a John Deere-supported warranty. Reconditioned parts see their failed components replaced with new versions and they get inspected. Depending on the part, they may or may not undergo testing. Rebuilt parts see their failed components replaced with either new or used parts, they may or may not get inspected and tested.
Remanufactured parts are great for people who may have older equipment, who may not be looking to resell their equipment or for whom the budget required to replace everything with brand new parts is just prohibitive.