The 387-9434 hydraulic injector is a critical fuel system component for Caterpillar C9 diesel engines. Designed for high-precision fuel injection, it is widely used in construction machinery such as the 330D and 336D excavators and the D6R and D7R bulldozers.
This injector precisely controls fuel injection quantity and timing for efficient combustion, improving engine power output and fuel economy while reducing emissions. Manufactured using high-strength metal and advanced processing techniques, it is wear-resistant, heat-resistant, and stable in high-pressure environments, ensuring long-term, reliable operation.
Product Features
- High-Precision Injection: Precisely controls fuel quantity and injection timing to improve engine combustion efficiency.
- Durable and Reliable: Constructed of high-strength metal, resistant to wear, high temperatures, and high pressures, ensuring long-term stable operation.
- Stable Performance: Maintains consistent output even under prolonged, high-load operation.
- Easy Installation: Standard interface design allows for direct replacement without additional modification.
- Wide Compatibility: Compatible with Caterpillar C9 series engines, including 330D and 336D excavators, D6R and D7R bulldozers, and other equipment.
- Reduced Maintenance Costs: Extends engine life and reduces downtime caused by fuel system failures.





Frequently Asked Questions
What products do you specialize in?
We specialize in excavator engine spare parts including cylinder blocks, cylinder heads, crankshafts, complete engine assemblies, pistons, liners, rings, camshafts, connecting rods, oil pumps, water pumps, valves, and all related engine components.
What if I only know the excavator model but not the part numbers?
You can send us photos of your existing parts, nameplate information, or dimensional specifications for reference and identification.
Do you accept sample orders?
Yes, we can supply samples of parts we have in stock. Customers are responsible for sample costs and shipping fees.
Do you test products before shipment?
All products undergo 100% quality testing before delivery to ensure performance and reliability.
What is your policy for defective items?
Our products are thoroughly tested, but if any issues arise, our professional after-sales team will promptly address and resolve them.