This Service Repair Manual covers the CASE 621D Wheel Loader, a robust piece of heavy equipment designed for demanding operational tasks. Engineered for reliability and efficiency, the CASE 621D is built to perform under challenging conditions, making it a valuable asset for various industrial and construction applications. Its construction emphasizes durability and optimal performance, ensuring consistent operation and productivity. This comprehensive manual provides detailed information essential for the maintenance, servicing, and repair of your CASE 621D Wheel Loader. It includes step-by-step procedures for engine, fuel system, electrical, steering, power train, brakes, and hydraulics. Furthermore, the manual offers technical specifications, troubleshooting guidance, and includes diagrams, illustrations, and schematics to aid in understanding and executing repairs. This resource is invaluable for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their equipment.