The Komatsu PC09-1 is a compact hydraulic excavator designed for efficient operation in confined spaces. With a focus on robust engineering and reliability, this model offers a powerful solution for various construction and landscaping tasks. Its compact dimensions, including a transport length of 2700 mm, a width of 1000 mm, and a height of 1560 mm, make it highly maneuverable and easy to transport between job sites. The PC09-1 features a hydrostatic transmission for smooth power delivery and a diesel engine, ensuring dependable performance. Its operating weight is 985 kg, and it boasts a standard bucket capacity of 0.025 cubic meters, with a maximum digging depth of 1745 mm and a digging radius of 3065 mm. This Service Repair Shop Manual provides comprehensive guidance for the maintenance and repair of the Komatsu PC09-1 hydraulic excavator. It covers essential procedures, technical specifications, and troubleshooting information to ensure optimal performance and longevity of the equipment. Key areas detailed include fluid capacities for the engine oil (4.0 liters), coolant (3.4 liters), and hydraulic system (14.5 liters), along with recommended service intervals for engine oil and filter changes (250 hours) and hydraulic filter replacement (500 hours). This manual is an indispensable resource for owners, technicians, and mechanics seeking to maintain and service their PC09-1 effectively.