This comprehensive Komatsu PC78US-6 and PC78UU-6 Excavator Service Manual provides detailed instructions and illustrations for servicing, repairing, and maintaining your excavator. This manual covers a wide range of components, including the engine, water coolant pump, track rollers, cylinder head, radiator, oil cooler, arm-bucket, boom-bucket, solenoid, canopy, cab, heating fan, fuel tank, hydraulic tank, P.T.O. power train, swing circle, final drive track, frame recoil, spring carrier roller, track roller, steel shoe, hydraulic system, circuit diagrams, hydraulic pump control valve, swivel joint, swing motor, travel motor, cylinders, accumulator, PPC valves, solenoid valve, electrical diagrams, testing and adjustments, removal and installation, special tools, starter motor, alternator, injection pump, engine-pump, control valve, platform, swivel joint, revolving frame, swing circle, rubber track shoes, steel track shoes, sprocket wheel, final drive, idler and recoil spring, spring recoil and thrust cylinder, idler, track rollers, boom cylinder, arm cylinder, bucket cylinder, boom swing cylinder, blade cylinder, and work equipment cylinders. This manual is the same one used by professional technicians and mechanics, making it an invaluable resource for DIY enthusiasts and anyone looking to perform repairs or maintenance on their Komatsu PC78US-6 or PC78UU-6 Excavator.

The Komatsu PC78US-6 and PC78UU-6 are compact excavators designed for a wide range of applications, from construction and landscaping to utility work and demolition. Packed with features and built to Komatsu's renowned standards of quality and durability, these excavators offer exceptional performance and reliability. The PC78US-6 is a standard configuration model, while the PC78UU-6 features an undercarriage designed for tight spaces and confined areas. Both models are powered by Komatsu's fuel-efficient and robust diesel engines, ensuring strong digging forces and smooth operation. Their compact size and maneuverability allow them to work in tight quarters, making them ideal for urban environments and projects with limited space. The PC78US-6 and PC78UU-6 excavators are equipped with a range of features designed to enhance operator comfort, safety, and productivity. These features include a spacious and ergonomically designed cab with excellent visibility, intuitive controls, and a comfortable operator seat. The excavator's hydraulic system is responsive and efficient, providing precise control of attachments and delivering smooth, powerful digging performance. The robust undercarriage, featuring durable tracks and track rollers, ensures long-lasting performance and reliable operation in a variety of terrain conditions. These excavators are also equipped with a comprehensive maintenance system that simplifies regular servicing and minimizes downtime, contributing to their overall value and cost-effectiveness.