This workshop service repair manual covers the Komatsu PC20R-8 and PC27R-8 compact excavators from the 8 Series. These machines are engineered for reliability and efficiency, featuring a robust diesel, water-cooled, 4-cycle engine. The PC20R-8 has an operating weight of 2060 kg and a maximum digging depth of 2710 mm, while the PC27R-8 weighs 2700 kg and can dig up to 3070 mm. Both models utilize a hydrostatic transmission and a tracked drive system, making them versatile for various construction and landscaping applications. This manual provides comprehensive information essential for the maintenance and repair of your Komatsu excavators. It details critical procedures, including engine oil specifications and capacities, hydraulic oil, and coolant requirements. Technical specifications, performance data such as digging depth and reach, and operational details are thoroughly explained. This resource is designed to assist owners, mechanics, and technicians in ensuring optimal performance, longevity, and safe operation of the PC20R-8 and PC27R-8 models.