What is Reman? Taking an end-of-life part or component that is broken or blemished — and returning it to a like-new state in a manufacturing environment. Why Cat® Reman? Because remanufactured parts and components give you more options when it’s time to repair or overhaul equipment. You can return a used component (core) in exchange for a remanufactured one, or buy them over the counter to minimize downtime and maximize productivity — at a lower cost.