This document provides comprehensive service and repair information for the Hyundai 20D-7E, 25D-7E, 30D-7E, and 33D-7E Forklift Truck series. These diesel-powered forklifts, manufactured by Hyundai Heavy Industries, are designed for robust material handling applications, with model designations indicating approximate lifting capacities. The '-7E' series represents a specific generation of these reliable machines, incorporating design updates and features for enhanced performance and efficiency. This Factory Service Repair Manual in English covers a wide array of critical systems and procedures, including general maintenance, troubleshooting, engine and transmission service, brake systems, electrical and fuel systems, cooling, steering, and suspension. It offers detailed repair instructions, diagnostic fault codes, technical data, safety guidelines, and operational procedures. The manual is intended for technicians, mechanics, service personnel, and owners to ensure the proper maintenance, repair, and safe operation of these Hyundai forklift trucks.