This manual covers the Komatsu WA90-5 Series, a versatile wheel loader designed for a wide range of material handling applications. Engineered for robust performance and reliability, this machine features a powerful Komatsu S4D102E-1 diesel engine, a hydrostatic transmission, and articulated frame steering for excellent maneuverability. With an operating weight of 5,500 kg and a standard bucket capacity of 1.0 m³, the WA90-5 is well-suited for construction, landscaping, and agricultural tasks, offering efficient operation and durability. The purpose of this Operation & Maintenance Manual is to provide comprehensive guidance for the safe and efficient operation, maintenance, and servicing of your Komatsu WA90-5. It details essential information including daily checks, lubrication schedules, engine oil and hydraulic oil change intervals, and technical specifications. This manual is an indispensable resource for owners, operators, and service technicians, offering detailed procedures and troubleshooting information to ensure optimal performance and longevity of the equipment.