The Allis Chalmers D-19 tractor, produced between 1959 and 1963, represents a significant piece of agricultural machinery from a prominent American manufacturer. As part of the esteemed 'D' series, known for their distinctive orange livery, the D-19 embodies robust engineering and a commitment to reliable performance in demanding agricultural environments. Its design focused on delivering practical power and efficiency, making it a valued workhorse for farmers of its time. This tractor is recognized for its contribution to agricultural mechanization, reflecting the era's advancements in farm equipment technology. This factory service repair manual provides comprehensive guidance for the Allis Chalmers D-19 tractor. It covers a wide array of systems, including detailed engine service, cooling and fuel systems, powertrain, front and rear axles, clutch, differential lock, electrical systems, brakes, fenders, fuel tank, platform, final drives, front-wheel drive (if equipped), hydraulic systems, main drive bevel gears, park brake, power steering, power take-off, steering gear, and transmission. The manual includes procedures for scheduled maintenance, lubrication, fluid changes, filter replacements, component repair, troubleshooting, and complete disassembly/reassembly. This resource is designed for both do-it-yourself owners and experienced mechanics, offering hundreds of pages with photos and illustrations to facilitate effective maintenance and repair.