The Allis-Chalmers B1 tractor, produced in the late 1950s and early 1960s, represents a robust and reliable machine designed for agricultural and general utility work. As part of the enduring B series line, this light utility tractor offers exceptional value and functionality, making it suitable for small farms, estates, and garden applications. Known for its affordability and enduring utility, the B1 is powered by a likely 4-cylinder gasoline engine and features a 3-speed manual transmission, with some models equipped with a two-speed pulley system or a hydrostatic drive unit for enhanced versatility. Its engineering quality and straightforward design have cemented its place as a respected piece of American agricultural machinery. This OEM Original Service Repair Manual provides comprehensive coverage for the Allis-Chalmers B1 tractor, encompassing service, repair, maintenance, and a wide array of original attachments. The manual details engine operation, powertrain systems including the 3-speed transmission and hydrostatic drive, chassis and steering components, and electrical systems. It offers step-by-step instructions, detailed diagrams, exploded views, and manufacturer specifications for regular tune-ups, lubrication, fluid changes, component overhauls, and troubleshooting. This resource is invaluable for owners, operators, maintenance personnel, and restoration enthusiasts seeking to maintain the optimal performance and longevity of their B1 tractor.