This workshop service repair manual covers the Allis-Chalmers Big Ten tractor, a product from a manufacturer historically known for agricultural and industrial equipment. While specific production years are not detailed, this comprehensive guide focuses on the operational and repair aspects of the Big Ten model lineage and its associated B-Series attachments. The manual is designed to provide in-depth information for do-it-yourself enthusiasts and experienced mechanics alike, serving as an inexpensive resource to maintain the vehicle's proper working condition and increase understanding of its systems. The purpose of this manual is to offer complete official factory service repair information, encompassing detailed engine repair, hydrostatic drive unit service, power train components, and electrical system diagnostics. It includes step-by-step maintenance and repair procedures, troubleshooting guidance, and technical specifications, supported by hundreds of photos and illustrations. The manual also covers B-Series attachments, providing a thorough resource for maintaining and repairing the Allis-Chalmers Big Ten tractor and its related equipment.