The KOMATSU PC550LC-8 / PC450-8 Injection Pump (Part No. 6251-71-1121) is a precision-engineered diesel fuel injection component used in heavy-duty Komatsu excavators. It plays a critical role in the engine’s fuel delivery system, ensuring accurate fuel metering, high-pressure injection, and stable combustion performance under demanding working conditions.B9iR

This injection pump is commonly applied in large Komatsu machinery such as the PC550LC-8 and PC450-8, both of which are designed for mining, earthmoving, and large-scale construction projects. Manufactured to OEM standards by Komatsu or its approved suppliers, the part is built for durability, fuel efficiency, and long service life in harsh environments.B9iR

Key Functions

• Delivers high-pressure diesel fuel to the engine’s injectors
• Ensures precise timing and fuel quantity control
• Supports optimal engine power output and fuel efficiency
• Helps reduce emissions and improve combustion stability

Features

• OEM-grade precision manufacturing
• High resistance to wear and heat
• Designed for heavy-load continuous operation
• Compatible with Komatsu SAA6D125 / related engine systems (depending on configuration)

Application

This injection pump is widely used in:B9iR

• Komatsu PC550LC-8 hydraulic excavator
• Komatsu PC450-8 hydraulic excavator
• Other Komatsu machines using compatible diesel engine systems

Summary

The 6251-71-1121 injection pump is an essential engine component that directly affects performance, fuel economy, and machine reliability. Proper installation and maintenance are critical to ensure long-term stable operation of Komatsu heavy equipment in construction and mining environments.B9iR