This comprehensive manual provides in-depth information on maintaining, assembling, disassembling, and servicing your Komatsu PC300-7, PC300LC-7, PC350-7, and PC350LC-7 hydraulic excavators. It is designed to help you achieve peak performance through efficient, economical, and safe operation and maintenance.

The manual is divided into two sections: a service repair manual and an operation & maintenance manual. The service repair manual features detailed specifications, diagrams, and real photographs, guiding you through every step of repair, servicing, technical maintenance, and troubleshooting procedures. This section enables you to identify and resolve problems, ensuring you can maintain your machine effectively without the need for external service.

The operation & maintenance manual provides detailed instructions on operating, handling, lubricating, maintaining, checking, and adjusting the excavator. This section is designed to empower both operators and maintenance personnel, ensuring they have the knowledge necessary for efficient, economical, and safe machine operation.

Within the service repair manual, you will find sections dedicated to:

* **General:** Covers fundamental information about the excavator
* **Structure, Function, and Maintenance Standard:** Provides details about the excavator's design, operation, and maintenance standards.
* **Testing and Adjusting:** Outlines procedures for testing and adjusting various components.
* **Disassembly and Assembly:** Offers step-by-step instructions for disassembling and reassembling machine components.
* **Others:** Contains additional information relevant to servicing and repair.

The operation & maintenance manual includes sections on:

* **Foreword:** Introduces the manual
* **Safety:** Emphasizes safety practices during operation and maintenance.
* **Operation:** Details operating procedures and techniques.
* **Maintenance:** Covers preventative maintenance and troubleshooting procedures.
* **Specifications:** Provides technical data and specifications for the excavator.
* **Attachments and Options:** Details available attachments and optional features.
* **Multi-Monitor Specification:** Provides information about multi-monitor systems.
* **Index:** Facilitates quick and easy reference within the manual.

This manual covers excavators with the following serial numbers:

* PC300-7: S/N 40001 and up
* PC300LC-7: S/N 40001 and up
* PC350-7: S/N 20001 and up
* PC350LC-7: S/N 20001 and up

The PC300, 300LC, PC350, and 350LC-7 excavators utilize the SAA6D114E engine. For detailed information on this engine, refer to the 114 Series Engine Shop Manual.

## The Komatsu PC300-7, PC300LC-7, PC350-7, and PC350LC-7 Hydraulic Excavators: Power and Precision in Construction

The Komatsu PC300-7, PC300LC-7, PC350-7, and PC350LC-7 are powerful hydraulic excavators designed for demanding construction, mining, and quarrying applications. These machines are known for their reliability, efficiency, and operator comfort, making them a favorite among professionals. The PC300-7 and PC350-7 models are standard configurations, while the "LC" variants (PC300LC-7 and PC350LC-7) feature a long undercarriage for increased stability and reach, particularly suited for trenching and other applications where extended reach and stability are required.

These excavators are powered by robust Komatsu engines known for their fuel efficiency and low emissions. The hydraulic system provides smooth and precise control, allowing operators to perform a wide range of tasks with ease. Advanced features like load sensing hydraulics optimize power consumption and hydraulic flow, further enhancing efficiency. The spacious cab offers excellent visibility, intuitive controls, and ample space for the operator, promoting comfort and reducing fatigue during long shifts. Safety is paramount in the design, with features like an emergency stop system, rollover protection structures, and a comprehensive safety checklist that ensures both the operator and the machine are protected from potential hazards.