This service repair manual covers the CASE CX800 crawler excavator, a robust machine engineered for demanding construction and earthmoving applications. Featuring a powerful Cummins QSB6.7 diesel engine with a displacement of 6.7 liters and a hydrostatic transmission with infinitely variable gears, this excavator is designed for efficiency and performance. Its substantial operating weight of approximately 75,000 lbs, coupled with impressive dimensions including a length of nearly 38 feet and a width over tracks of over 10 feet, underscores its capability in large-scale projects. The CX800 is built with CASE's commitment to engineering quality and reliability, making it a dependable asset on any job site. This comprehensive manual provides essential information for the maintenance, repair, and operation of the CASE CX800 crawler excavator. It details critical procedures, technical specifications, and troubleshooting guides necessary for keeping the machine in optimal working condition. Coverage includes routine maintenance schedules, such as daily checks and 250-hour service intervals involving engine oil and filter changes, as well as guidance on filter replacement. This resource is invaluable for owners, operators, and technicians seeking to ensure the longevity, performance, and safety of their CASE CX800 excavator.