This document pertains to the Caterpillar DP80 and DP90 Forklift Lift Trucks, with models identified by serial number prefixes 1DP for DP80 and 2DP for DP90. These robust machines are engineered for demanding operational environments, offering reliable performance and efficient material handling. The manual covers models dependent on specific serial numbers, ensuring accurate information for maintenance and repair. This comprehensive Factory Service Repair Workshop Manual provides detailed instructions for the maintenance and repair of your Caterpillar forklift. It includes step-by-step procedures, easy-to-read text, and top-quality diagrams for complete disassembly of the machine. Coverage extends to essential systems such as the engine, transmission, cooling, electrical, power train, axles, brakes, steering, and hydraulics, as well as masts and forks. Service data and troubleshooting information are included to assist both do-it-yourself owners and experienced mechanics.