The Allis-Chalmers HB-112 tractor represents a significant piece of agricultural machinery, built with the robust engineering and reliability characteristic of the Allis-Chalmers brand, known for its extensive heritage in agricultural and construction equipment. This tractor, part of the HB series, is designed for demanding tasks, offering durability and performance. Its construction emphasizes quality, ensuring it can handle the rigors of its intended use in various operational environments. This comprehensive service repair manual provides detailed information for the Allis-Chalmers HB-112 Tractor, covering all styles. It serves as an essential resource for both do-it-yourself owners and experienced mechanics, offering factory-level detail for maintenance and repair. The manual includes step-by-step instructions for engine overhaul, powertrain systems, hydrostatic drive units, electrical systems, and B-Series attachments, alongside standard maintenance procedures, lubrication schedules, and diagnostic troubleshooting for common and uncommon issues. With hundreds of pages, photos, and illustrations, it delivers complete factory-level detail, including torque values, clearances, and timing settings, ensuring the vehicle remains in optimal condition.