This manual covers the Allis-Chalmers B1 (B-1) tractor, a compact utility machine produced during the late 1950s to early 1960s. Designed for general farm, lawn, and light industrial applications, the B1 represents Allis-Chalmers' commitment to durable and reliable agricultural equipment. Its robust engineering, typical of the era, ensures longevity and capable performance for a variety of tasks. This manual also details numerous factory and auxiliary attachments, including various mowers, tillers, snow throwers, and loaders, expanding the versatility of the B1 tractor. This comprehensive Service Repair Manual and Parts Catalog provides essential information for owners, operators, maintenance personnel, and restoration enthusiasts of the Allis-Chalmers B1 tractor. It offers detailed, factory-original content covering engine systems, drivetrain, chassis, steering, and electrical systems. Included are step-by-step repair instructions, maintenance procedures, troubleshooting guides, and parts identification with illustrations. The manual is designed to facilitate efficient maintenance, accurate repairs, and optimal performance of the tractor and its attachments, ensuring the continued utility and value of this classic machine.