Product Specifications:
The 20R5079 is a heavy-duty, precision-engineered Common Rail Diesel Fuel Injector (Aftermarket Replacement) designed specifically for Caterpillar C9.3 (and select C7) 6-cylinder diesel engines. These highly efficient powerplants are the beating heart of heavy construction equipment, most notably the popular 336E series excavators and medium wheel loaders. Manufactured to verify against rigorous OEM testing protocols to ensure optimal fuel atomization, emissions compliance, and maximum hydraulic power output.
📊 Part Number Cross Reference
(Data verified via global catalog search)
| Brand (Ref Only) | Part Number |
| Caterpillar (Ref) | 20R-5079 / 20R5079 |
| Interchange Numbers | 456-3544 / 4563544 |
🚛 Fits Applications (Engine & Vehicle)
(Verified application list)
| Make | Machine / Model | Engine Code |
| Caterpillar | Excavator: 336E, 336EL, 336ELN | C9.3 |
| Caterpillar | Forest Machine / Loader: 568 FM | C9.3 |
| Caterpillar | Wheel Loader: 966K, 972K | C9.3 |
👨🔧 Tech Notes & Installation Guide
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💰 Why Replace the Full Set?
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The Risk: Mixing a brand-new common rail injector with old, worn units on a 6-cylinder C9.3 engine causes severely uneven fuel delivery. This leads to Cylinder Power Imbalance (Engine Vibration, Drivetrain Stress, and Increased Fuel Consumption under heavy load).
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The Fix: Take advantage of our Volume Discounts to install a matched set of 6 units. This ensures uniform fuel pressure across the rail and restores smooth factory performance.
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✅ Calibration & Installation:
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These injectors are pre-calibrated on the test bench to match OEM flow standards. (Note: Depending on your specific ECM software version, entering the unique injector trim code into the Caterpillar system may be required during installation for optimal fuel mapping).
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⚠️ Critical Cleaning Step:
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The entire high-pressure fuel delivery system (tank, lines, and rails) MUST be thoroughly flushed to remove metal shavings and debris. Always install a brand-new, high-efficiency fuel filter to protect the precision control valves from scoring.
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🔍 Explore More Heavy Duty Parts:
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Looking for more options? Browse our complete selection of Fuel Injectors.
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Keep your engine running smoothly with our premium Engine Components.
⚖️ Legal Disclaimer
Part numbers, OE numbers, and brand names (e.g., Caterpillar, CAT) mentioned above are for reference and identification purposes only. This product is a compatible aftermarket replacement part and is NOT manufactured, sponsored, or affiliated with the original equipment manufacturers.
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