The Allis-Chalmers 7080 Tractor, a robust and reliable machine produced in the late 1970s and early 1980s, represents a significant achievement in agricultural engineering. Featuring a powerful D-21 Series II turbocharged diesel engine with approximately 140 PTO HP and a versatile Power Director transmission, this tractor was designed for demanding tasks. Its legacy is built on Allis-Chalmers' long-standing reputation for innovation and durability in the agricultural sector. The 7080 Standard model, with its substantial operating weight and focus on core functionality, embodies the practical strength and efficiency expected of its class. This comprehensive workshop service and repair manual provides detailed information for professional technicians and experienced DIY mechanics. It covers essential maintenance procedures, including routine service, lubrication schedules, and fluid changes, alongside step-by-step repair instructions for all major systems. The manual delves into the engine, transmission, hydraulic, electrical, cooling, fuel, and brake systems, offering troubleshooting guides, overhaul procedures, and crucial torque specifications. With original factory data, wiring diagrams, and special tool identification, this English-language manual is an indispensable resource for maintaining the Allis-Chalmers 7080 Tractor's performance and longevity.