2645A749 Fuel Injector Assembly for construction machinery

product parameters

Part No：2645A749
Product Type：Diesel Fuel Injector Assembly
Original Manufacturer：CAT aftermarket
Applicable Engine：CAT C6.6 Diesel Engine
Applicable Equipment：Caterpillar Construction Machinery (323D Excavator)
Spray Hole Quantity：6 holes high-precision atomization holes
Main Material：High-strength alloy steel + imported high-speed steel needle valve
Rated Working Pressure：1610 bar
Adaptable Temperature：-25℃ ~ +130℃
Net Weight：Approx. 788g
Interface Specification：Standard thread
Accessories：Comes with original matching sealing ring
Testing Standard：100% full-load bench calibration test
Packaging：Independent anti-rust packaging + neutral carton
Storage Requirements：Dry indoor storage, avoid moisture, dust and corrosive environment

• **Precise fuel injection control, perfectly adapted to heavy-duty engineering working conditions**
Delivers highly accurate injection quantity and timing under rapidly fluctuating loads. Sustains steady and reliable power output even under continuous heavy workloads on tough construction sites, effectively minimizing power sagging during sudden load changes and improving engine response.
• **High-efficiency atomization for optimized combustion and reduced fuel consumption**
Fine and uniform fuel spray greatly improves combustion efficiency. It effectively cuts black smoke emission and carbon deposition inside cylinders, saving fuel cost for equipment owners and lowering exhaust pollutant release to meet stricter emission requirements.
• **Premium wear-resistant core components, anti-impurity and less prone to valve sticking**
Core parts adopt high-strength alloy material processed by ultra-precision machining. It has strong resistance against abrasive particles mixed in diesel fuel, greatly extending the overall service life and reducing unexpected unplanned downtime of construction machinery.
• **Full bench testing for every unit, excellent performance consistency**
Each injector is fully tested for injection rate, sealing and leakage before delivery. Strict tolerance control ensures stable and consistent performance batch by batch, effectively reducing individual product performance differences for mass replacement.

FAQ 

Q1: What equipment and engines is the 2645A749 injector suitable for?
A1: It fits CAT C6.6 engine, widely used for Caterpillar construction machinery including 323D excavator. It is fully interchangeable with 320-0690,10R-7673 and other related injector models. Please confirm the engine model before installation to avoid mismatch, wrong model may lead to poor engine performance.

Q2: What failures can this injector solve?
A2: It can effectively repair common diesel engine faults: weak acceleration, unstable idle speed, difficult cold start, black/blue exhaust smoke, high fuel consumption and engine power drop. These symptoms are usually caused by aging or damage of original injectors.

Q3: Is coding and calibration required after installation?
A3: Factory pre-calibrated, plug and play without complicated coding. If replacing multiple injectors at the same time or ECU stores historical fault codes, clearing fault codes is recommended for better idle stability and fuel economy.

Q4: What pre-installation preparations are required?
A4: Thoroughly clean fuel pipelines to remove impurities and sludge; install brand-new fuel filter and injector sealing gaskets; inspect high-pressure fuel pump working condition, to avoid secondary damage caused by pipeline contaminants. Clean fuel system is critical for injector service life.

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