387-9431 10r-9003 Fuel Injector 10r-9003 Injector Nozzle for C9 Engine 330d 330d L336D Excavator

<Product Description> This high-pressure electro-hydraulic unit nozzle assembly (standard part code: 387-9431, common OE cross-reference and interchangeable part numbers include 3879431, 10R-7225, 10R7222, 10R7225, 254-4339, etc.) is precision-engineered for heavy-duty construction machinery, large mining equipment, and high-power diesel platforms (such as the C7 series 7.2L diesel engine, commonly installed in 324D, 325D, 329D tracked excavators, 120K series graders, and loaders). As the core micro-control actuator of the HEUI electro-hydraulic unit injection system, it can accurately meter high-pressure diesel fuel and rapidly disperse it into nano-sized micro-atomized particles within a microsecond reaction time, achieving complete mixing and full combustion of fuel and intake airflow.

The product adheres to the technical manufacturing standards of "high-pressure micro-atomization and microsecond-level ultra-fast response." The internal needle valve assembly and armature control valve core are made from carefully selected aerospace-grade quenched special alloy steel, combined with ultra-high precision geometric grinding and low-friction polishing. The surface is covered with a high-density, anti-coking hardened coating, effectively preventing early erosion caused by diesel particulates. After the parts are installed and replaced, equipment operators and on-site maintenance personnel will experience a significant performance improvement: the engine starts crisply and cleanly, and the severe vibrations and jerks at low idling speeds are stabilized; under full-load tunneling or high-intensity continuous operation, the control lever and throttle are tight and smooth, acceleration is rapid and powerful, and black smoke emissions are significantly reduced, resulting in an excellent overall fuel control experience.

<Product Description>

<Product Advantages>
Advantages: Integrated precision manufacturing at a self-operated modern production base.

Problems Solved: Traditional OEM and multi-level procurement models involve complex processes that easily lead to excessive tolerances in component fit, uneven fuel supply to cylinders, and high-pressure leaks, while significantly increasing procurement costs.

Value Gained: By relying on a self-built standardized production plant for precision manufacturing throughout the entire process, the layers of intermediaries are eliminated, ensuring consistent injection height across all cylinders. This reduces maintenance costs and provides a solid and reliable power guarantee for long-term equipment operation.

Advantages: Full-condition, ultra-high pressure, dynamic micron-level bench inspection.

Problems Solved: Addresses common issues in low-end components such as injection atomization deviation, incomplete combustion due to sluggish solenoid valve response, engine misfires, idling vibrations, and wasted time and additional costs from secondary disassembly and reassembly.

Value Gained: Each nozzle unit undergoes fully automated digital testing before leaving the factory. Under fully simulated high-temperature and ultra-high-pressure conditions, the injection volume and return oil sealing are precisely calibrated across different pressure ranges, ensuring immediate usability after installation and significantly saving time and costs associated with equipment disassembly and reassembly.

Advantages: Large-scale warehousing with readily available stock and rapid delivery response.

Problems Solved: Commercial vehicles and construction machinery are high-upload, high-revenue tools. If they become stranded due to fuel system failure, the resulting downtime and lack of materials will incur costly delays, compensation, and lost work time.

Value Brought: The warehousing center maintains a sufficient stock of best-selling specifications year-round. After order confirmation, a rapid response is provided, with priority packing and dispatch within 24-48 hours, significantly shortening the logistics and delivery cycle. This helps fleets and owners quickly restore equipment availability and effectively avoids downtime losses.

Advantages: Nano-level DLC coating and special wear-resistant alloy valve pairs.

Problems Solved: Addressing issues such as premature wear of valve pairs, needle valve jamming, and excessive oil return caused by differences in diesel lubrication and particulate impurities in different regions.

Value Brought: Core valve pairs are made of high-strength special bearing steel with a surface anti-corrosion hardening treatment, significantly improving fatigue resistance and wear resistance. Even under harsh environments and prolonged high-load operation, they maintain stable performance, avoiding the additional costs of frequent disassembly and repair.

</Product Advantages>

<Parameter Table>

| Parameter Name | Parameter Value |

| --- | --- |

| Product Name | Heavy-Duty Engineering Machinery Electro-Hydraulic Unit Injector (HEUI Injector) |

| Standard OE Part Number | 387-9431 |

| Interchangeable Part Numbers | 3879431 / 10R-7225 / 10R7222 / 10R7225 / 254-4339 |

| Applicable Engine Platform | C7 Series 7.2L Diesel Engine |

| Fuel Supply System | HEUI Electro-Hydraulic Unit Injection System |

| Core Needle Valve Material | Aerospace-grade hardened bearing steel, corrosion-resistant high-hardness special alloy steel |

| Surface Treatment Process | High-density, ultra-wear-resistant DLC hardened coating |

| Nozzle Machining Technology | EDM high-precision electrical discharge micro-hole machining |

| Operating Temperature Range | -40°C to +125°C |

| Internal Sealing Components | Original Equipment Manufacturer (OEM) High-Temperature Resistant and Anti-Swelling Special Fluororubber (FKM O-Rings) |

| Net Weight per Unit | Approx. 1.15 kg / piece |

| Factory Testing Standards | 100% Automated Full-Condition Bench Flow and Sealing Tests |

| </Parameter Table> | |

<Application Scenarios> Open-pit Mining and Large Tracked Excavator Operations: Large excavators and mining loading equipment continuously excavate and load large rocks in harsh, high-dust, and high-intensity environments, placing extremely high demands on engine fuel supply stability and power output. When on-site operators notice a decrease in equipment digging force, significant and severe vibration at idle, or frequent black smoke from the exhaust pipe, maintenance personnel promptly replace worn parts and install this high-precision fuel injector. After replacement, fuel injection atomization is extremely uniform, and the hydraulic system power output is restored to ample and stable levels, ensuring efficient and uninterrupted mining operations.

Large-scale road construction and continuous operation scenarios for graders and bulldozers: When graders and bulldozers are engaged in highway infrastructure work, their engines need to maintain a stable low-speed, high-torque output for extended periods. When equipment experiences starting difficulties, sluggish acceleration, or abnormally high fuel consumption, the engineering mechanic team will replace the entire fuel supply system. Precise electronic injection control restores smooth engine operation, significantly improving fuel efficiency and acceleration response, avoiding additional labor costs caused by construction downtime.

**Application Scenarios**

Q: Can I use the product directly after installation? Is it necessary to enter a correction code?

A: Each injector has a unique flow correction code (IMA code) generated during factory testing. It is recommended to use a diagnostic tool to flash the correction code into the engine ECU after installation to achieve optimal fuel efficiency and smoothness.

Q: What is the inventory and delivery time for bulk purchases?

A: We have our own factory and large warehouse, and maintain a large inventory of this model year-round. Standard orders can be packaged and shipped within 24-48 hours, and large-volume orders can also be quickly scheduled for production line setup.

Q: How do you guarantee the quality and performance of your products before they leave the factory?

A: All injectors undergo assembly in a Class 100 cleanroom and 100% full-condition bench testing, covering key indicators such as sealing, pre-injection volume, full-load injection volume, and return oil volume. These stringent testing standards ensure that they are high-quality products from the outset.

Q: What is the warranty period for your products? What are your after-sales service details?

A: We offer a 12-month warranty period. If a performance failure occurs within the warranty period due to non-human factors, we provide rapid replacement or after-sales technical support to ensure your peace of mind when using our products.