1. The John Deere 644K Hybrid 4WD Loader with IT4/S3B engine (SN. from E651322) OMT276750 is a powerful and efficient machine designed for heavy-duty construction and earthmoving tasks. This loader combines the reliability of a traditional diesel engine with the eco-friendly benefits of a hybrid system, making it a versatile and environmentally conscious choice for any job site. With a free online manual included, operators can easily access important information and maintenance guidelines to ensure optimal performance and longevity of the equipment.