This manual covers the Allis Chalmers AC 620 Tractor, an operator's and owner's guide designed to assist with the maintenance and operation of your equipment. It provides detailed instructions, manufacturers' specifications, and visual aids such as diagrams and illustrations to ensure you can properly care for your tractor. This guide is an essential resource for understanding the capabilities and upkeep requirements of the AC 620. The scope of this manual is comprehensive, encompassing crucial areas such as safety precautions, operational guidelines, adjustment procedures, routine maintenance schedules, and technical specifications. It also includes information on accessories and attachments. This document is intended to empower owners and technicians with the knowledge necessary for efficient operation, regular upkeep, and troubleshooting, ensuring the longevity and optimal performance of the Allis Chalmers AC 620 Tractor.