This comprehensive manual provides detailed technical information and repair procedures for the Hitachi Zaxis 27U-2, 30U-2, and 35U-2 excavators. It includes two essential manuals: a Workshop Manual and a Technical Manual, along with electrical circuit diagrams. The **Workshop Manual** covers a wide range of topics, including: * **General Information:** This section covers essential information such as safety precautions, tightening procedures, painting guidelines, bleeding air from the system, and instructions for operating the floor-tilting device. * **Upperstructure:** This section details the repair and maintenance of components found in the upperstructure, including the canopy, counterweight, pump device, control valve, swing device, pilot valve, and solenoid valve. * **Undercarriage:** Explore the undercarriage components and their maintenance, such as the swing bearing, travel device, center joint, track adjuster, front idler, upper and lower rollers, and track assembly. * **Front Attachment:** This section focuses on the front attachment and its cylinder, covering repair and maintenance procedures specific to this component. * **Engine:** Detailed information and instructions for the engine's maintenance and repair are provided. The **Technical Manual** offers a deeper understanding of the excavator's systems and components: * **General:** This section provides specifications, component layouts, and component specifications for the excavator. * **System:** Explore the control system, hydraulic system, and electrical system in detail, providing a comprehensive understanding of their operation. * **Component Operation:** This section delves into the operation and maintenance of specific components, including the pump device, swing device, control valve, pilot valve, travel device, and other components within the upper and undercarriage. * **Operational Performance Test:** Detailed instructions are provided for conducting performance tests on the engine, excavator, and individual components, ensuring optimal operation. * **Troubleshooting:** This section assists in diagnosing and resolving problems, offering step-by-step troubleshooting procedures for various mechanical and electrical issues. The **Electrical Circuit Diagrams** provide a visual representation of the excavator's electrical system, including hydraulic and electrical circuits, floor harness, main harness, engine harness, air conditioner harness, battery harness, boom light harness, auto-idle pressure sensor harness, immobilizer harness, travel alarm harness, and auxiliary flow selector valve switch. This manual provides a complete and detailed resource for technicians and mechanics working on Hitachi Zaxis 27U-2, 30U-2, and 35U-2 excavators.

The Hitachi Zaxis 27U-2, 30U-2, and 35U-2 excavators are compact and versatile machines designed for a wide range of applications, primarily in urban environments, landscaping, and construction projects. They are known for their maneuverability, powerful performance, and operator comfort. These excavators boast a robust construction, featuring a sturdy undercarriage and a reliable hydraulic system, ensuring durability and longevity in demanding working conditions. The Zaxis 27U-2, 30U-2, and 35U-2 models are powered by fuel-efficient diesel engines, providing ample power while minimizing emissions. These machines are also equipped with various safety features, including an emergency stop button, an audible backup alarm, and a rollover protection structure (ROPS) for enhanced operator safety. The Hitachi Zaxis 27U-2, 30U-2, and 35U-2 excavators come equipped with a spacious and ergonomically designed cab, offering operators a comfortable and productive working environment. The cab features a user-friendly control layout, a comfortable seat with adjustable settings, and excellent visibility, allowing operators to maintain a clear view of their surroundings. The machines are also designed with noise and vibration reduction features, ensuring a quieter and smoother operation. Additionally, the Zaxis 27U-2, 30U-2, and 35U-2 excavators offer a range of attachments, including buckets, breakers, and grapples, providing versatility and adapting to various site conditions. These attachments expand the machines' capabilities, enabling them to handle a wider range of tasks, making them valuable assets for a diverse range of projects.