This document provides detailed service, maintenance, and repair information for PC800-8R, PC800LC-8R, PC800SE-8R, PC850-8R, and PC850SE-8R hydraulic excavators. It includes technical specifications, system diagrams, troubleshooting procedures, hydraulic and electrical system details, component breakdowns, and step-by-step repair instructions. Designed for technicians, mechanics, and equipment owners seeking accurate technical reference material to support diagnostics, servicing, and overhaul tasks.