This comprehensive Operation & Maintenance Manual provides detailed instructions for operating and maintaining the Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 hydraulic excavators. It covers all models with serial numbers starting from 50001 for the PC400-7 and PC400LC-7, and 20001 for the PC450-7 and PC450LC-7.

The manual is designed to guide both operators and maintenance personnel towards safe, efficient, and cost-effective operation and maintenance of the machines. It includes detailed information on:

* **Safety:** The manual emphasizes safety procedures, including machine operation, maintenance, and safety labels.
* **Machine Operation:** This section covers machine view illustrations, a detailed explanation of controls and gauges, operating procedures, transportation, cold weather operation, and long-term storage.
* **Troubleshooting:** Find guidance on diagnosing and resolving common machine issues.
* **Maintenance:** The manual provides detailed instructions on lubrication, maintenance schedules, procedures, and specifications for lubricants, fuel, coolant, filters, wear parts, and tightening torques.
* **Specifications:** Comprehensive specifications for the excavators, including attachments and options.
* **Attachments & Options:** Find information on recommended attachment operations and general precautions for safe attachment use.

This manual is designed to help you maximize the performance and longevity of your Komatsu excavators.

The Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 hydraulic excavators are heavy-duty construction machines designed for demanding excavation and material handling tasks. These models, with serial numbers 50001 and up for the PC400/450-7 and 20001 and up for the PC400/450LC-7, represent the seventh generation of Komatsu's renowned PC400 and PC450 series. The PC400/450-7 models are standard excavators with a conventional boom and stick configuration, while the PC400/450LC-7 are long-reach versions with an extended boom and stick for reaching further and working in confined areas. All models boast powerful Komatsu engines, hydraulic systems, and robust construction, delivering exceptional digging force, lifting capacity, and durability.

The Komatsu PC400/450-7 and PC400/450LC-7 excavators are equipped with advanced features that enhance operator comfort, safety, and productivity. These features include spacious cabs with ergonomic controls, a comprehensive monitoring system for machine performance and operating conditions, and a powerful hydraulic system that delivers precise and responsive operation. The excavators are also designed with safety in mind, incorporating features such as a robust safety cage, multiple warning systems, and optional safety devices. The combination of power, performance, and safety features makes these excavators ideal for a wide range of applications, including heavy excavation, material handling, demolition, and quarrying.