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The Main Crankshaft Bearing John Deere fits many different Series STD AT21140 is a high-quality engine component designed specifically for John Deere equipment. Made in India, this bearing is a single part that fits multiple models within the 300 Series. With the brand's reputation for durability and reliability, this product ensures smooth and efficient operation of heavy equipment. Customers can trust that this crankshaft bearing will keep their equipment running smoothly for an extended period of time.