The Allis-Chalmers B-12 Tractor represents a significant piece of agricultural machinery, known for its robust design and operational longevity. As part of the esteemed B-Series line from Allis-Chalmers, a historically prominent American manufacturer, this model embodies utility and affordability. While specific production years are not detailed, the B-12 is recognized for its dependable performance, making it a valuable asset for owners and operators. Its engineering quality and reliability are hallmarks of the Allis-Chalmers brand, ensuring it can handle demanding tasks. This comprehensive workshop service and repair manual provides factory-level detail across hundreds of pages, covering all major components and systems of the Allis-Chalmers B-12 Tractor. It includes in-depth information on engine disassembly and overhaul, transmission and hydrostatic drive unit service, electrical system troubleshooting with wiring diagrams, and maintenance procedures for B-Series attachments. The manual is designed to assist owners, operators, and technicians with diagnostics, repair, and routine maintenance, offering detailed instructions, illustrations, and troubleshooting guides to ensure optimal performance and longevity.