This service repair manual covers the Case 410 Skid Steer Loader, 420 Skid Steer Loader, and 420CT Compact Track Loader. These machines are engineered for demanding work environments, offering robust performance and reliability. While specific production years are not detailed, this manual is designed to support owners and operators in maximizing the operational life and efficiency of their equipment. The focus is on providing comprehensive information to ensure these versatile loaders continue to perform their intended tasks effectively. The purpose of this manual is to provide detailed technical guidance for the maintenance, repair, and troubleshooting of the Case 410, 420 Skid Steer Loaders, and 420CT Compact Track Loaders. It includes essential information on service procedures, technical specifications, and diagnostic strategies. By consulting this English-language resource, owners, technicians, and mechanics can confidently perform routine maintenance, address operational issues, and ensure the continued safe and efficient operation of their Case equipment.