This manual covers the CASE CX135SR Crawler Excavator, a robust piece of equipment designed for demanding construction and earthmoving tasks. Engineered for reliability and efficiency, the CX135SR features a powerful ISUZU 4BG1T turbocharged diesel engine, ensuring consistent performance across various applications. Its advanced hydraulic systems and durable construction make it suitable for extensive repair, servicing, and technical maintenance operations. This comprehensive guide addresses multiple configurations, including North American and European variants, as well as monobloc and offset boom options, reflecting the machine's versatility. The purpose of this English-language, 988-page Service Repair Manual SET is to provide detailed technical information for the maintenance and repair of the CASE CX135SR Crawler Excavator. It includes extensive coverage of all major systems, such as power production, distribution, travelling, body and structure, frame positioning, working arm, and tools. Furthermore, it incorporates detailed information for the ISUZU 4BG1T engine, covering general information, maintenance, disassembly, inspection, repair, reassembly, cooling, lubrication, and fuel systems, along with troubleshooting guidance and special tools. This manual is an essential resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the equipment.