The Komatsu WA70-1 Series represents a robust and reliable compact wheel loader, designed for a variety of demanding tasks. Featuring a powerful Komatsu S4D102E-1 diesel engine with a displacement of 3.6 L, this machine delivers approximately 62 HP, making it suitable for construction, landscaping, and material handling applications. Its hydrostatic transmission ensures smooth operation and variable speed control, while the articulated frame with oscillation provides excellent maneuverability and stability on uneven terrain. With a bucket capacity of approximately 1.0 m³ and a rated operating load of around 2,100 kg, the WA70-1 is engineered for efficiency and productivity. This Workshop Service Repair Manual provides comprehensive guidance for the maintenance and repair of the Komatsu WA70-1 Series wheel loader. It covers essential procedures, technical specifications, and troubleshooting information necessary for optimal performance and longevity. Key areas detailed include engine specifications, hydrostatic transmission system, hydraulic system operation, lubrication requirements, and recommended service schedules, such as the initial 50-hour engine oil change and subsequent 250-hour intervals. This manual is an indispensable resource for owners, operators, and technicians seeking to understand, maintain, and service their equipment effectively.