This manual covers the Komatsu WA120-1LC Wheel Loader, designed for efficient operation and reliable performance. Engineered for demanding work environments, this machine represents Komatsu's commitment to quality and durability. Its robust construction and thoughtful design ensure it can handle a variety of tasks, making it a valuable asset for construction, material handling, and other industrial applications. The purpose of this Operation & Maintenance Manual is to provide comprehensive guidance for the safe and effective use of your Komatsu WA120-1LC Wheel Loader. It details essential procedures for operation, lubrication, maintenance, checking, and adjustment, all aimed at achieving peak performance and extending the machine's service life. This manual is an indispensable resource for owners, operators, and technicians, offering step-by-step instructions, diagrams, and technical specifications to support all maintenance and repair needs.