This manual covers the Isuzu FRR F-Series WT5500 medium-duty commercial truck, produced between 1998 and 2002. Known for Isuzu's reputation for reliable diesel engines and durable commercial vehicle platforms, the WT5500 is a robust truck often utilized for local delivery, utility services, and various specialized applications. Powered by the 6HE1-TC engine, a 7.1-liter inline 6-cylinder diesel with turbocharging and intercooling, these trucks are engineered for demanding work environments. Their design prioritizes uptime and longevity, making them a dependable choice in their market segment.

This comprehensive factory service repair manual, presented in English and exceeding 1000 pages, provides in-depth workshop repair and parts information. It details maintenance procedures, diagnostic troubleshooting, and step-by-step repair instructions for all major vehicle systems, including engine, transmission, electrical, chassis, and body/interior components. The manual serves as an essential resource for owners, mechanics, and technicians, offering factory-level detail for everything from routine maintenance to complete component overhauls, ensuring optimal performance and longevity of the Isuzu FRR F-Series WT5500.