The Allis-Chalmers D10 Series 3 Tractor represents a robust piece of agricultural machinery, known for its engineering quality and reliability. Designed for a variety of farm tasks, this tractor embodies the enduring legacy of Allis-Chalmers in providing dependable equipment. Its construction and operational capabilities are a testament to the practical advancements in tractor technology during its production era, making it a valuable asset for agricultural operations. This Workshop Service Manual provides comprehensive guidance for the Allis-Chalmers D10 Series 3 Tractor. It covers essential repair, maintenance, adjustments, removal, installation, disassembly, assembly, troubleshooting, and diagnosis procedures. The manual includes factory specifications, allowable limits, wear limits, and details on special tools required for service. Its purpose is to assist owners, mechanics, and technicians in maintaining and repairing the tractor, ensuring its optimal performance and longevity through detailed explanations, diagrams, and factory data.