This Service Repair Manual provides comprehensive information for the AM General M939 Series, including the M939A2 variants. Engineered for demanding operational environments, these vehicles are built upon a robust chassis featuring multi-leaf spring suspension and powerful air brakes. Propulsion is handled by a Cummins NHC 250 engine, a 11.0-liter powerplant delivering 240 horsepower and 605 lb-ft of torque, coupled with an Allison 5-speed automatic transmission and a 2-speed, full-time 4x4 transfer case. With a substantial curb weight and significant payload capacity, the M939 Series is designed for heavy-duty applications, embodying reliability and durable construction.

This manual serves as an essential resource for maintaining and repairing the AM General M939 Series vehicles. It covers a wide array of critical areas, including detailed engine and transmission specifications, chassis components such as suspension and braking systems, and fluid capacities and types for routine maintenance. Owners, mechanics, and technicians will find step-by-step procedures, technical data, and troubleshooting guidance to ensure optimal performance and longevity of the vehicle. The manual is presented in English and is designed to be a complete reference for all service-related needs.