This manual covers the Komatsu WA250-3A, a robust machine designed for effective, economical, and safe operation and maintenance. Engineered for reliability, this model represents a significant advancement in its class, offering enhanced performance and user-centric features. Its construction quality ensures durability in demanding environments, making it a dependable choice for a wide range of industrial and construction applications. The purpose of this comprehensive Operation & Maintenance manual is to assist operators and maintenance personnel in achieving peak performance from their WA250-3A. It provides detailed information on all aspects of machine care, including operation procedures, lubrication, scheduled maintenance, troubleshooting, and safety precautions. The manual is organized into logical sections covering safety, introduction, operation, maintenance, and optional attachments, ensuring that all necessary information for effective machine management is readily accessible.