Product Specifications:
The 2321175 is a heavy-duty, precision-engineered HEUI Fuel Injector (Hydraulically Actuated Electronically Controlled Unit Injector – Aftermarket Replacement) designed specifically for Caterpillar 3408E (V8) and 3412E (V12) diesel engines. These massive powerplants are the backbone of extreme heavy equipment, widely utilized in quarry trucks (769D, 771D, 775D), track-type tractors (D9R), wheel loaders (988F), marine vessels, and industrial machinery. Manufactured to verify against rigorous OEM testing protocols to ensure maximum horsepower output and durability under extreme loads.
📊 Part Number Cross Reference
(Data strictly verified based on application catalog)
| New Part Number | Reman Part Number |
| 232-1175, 2321175 | 20R-0758, 20R0758 |
| 174-7526, 1747526 | 10R-1265, 10R1265 |
| 159-0835, 1590835 | 0R-9420, 0R9420 |
| 138-8754, 1388754 | 0R-9420, 0R9420 |
| 119-3166, 1193166 | 0R-8624, 0R8624 / 0R-8207, 0R8207 |
🚛 Fits Applications (Engine & Vehicle)
(Verified application list)
| Make | Machine | Engine and model |
| Caterpillar | Industrial / Marine / Petroleum | 3412E |
| Caterpillar | Quarry Truck | 3412E 775D |
| Caterpillar | Track-Type Tractor | 3408 D9R |
| Caterpillar | Truck | 3408E 769D, 771D |
| Caterpillar | Underground Art Truck | AD40, AD45, AE40, AE40 II |
| Caterpillar | Wheel Loader | 3408E 988F |
| Caterpillar | Wheel Scraper / Tractor | 3408E 657E, 651E |
👨🔧 Tech Notes & Installation Guide
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💰 Why Replace the Full Set?
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The Risk: The 3408E and 3412E are massive V8 and V12 engines. Mixing a brand-new HEUI injector with old, worn units causes severely uneven fuel delivery. This leads to Cylinder Power Imbalance (Heavy Engine Vibration, Knocking, Drivetrain Stress, and Smoke).
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The Fix: Take advantage of our Volume Discounts to install a matched set of 8 or 12 units (depending on your engine). This ensures uniform injection pressure and restores smooth factory performance.
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✅ Verification & Calibration:
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These HEUI injectors are precisely calibrated on the test bench. Proper mechanical clearance/valve lash adjustments are strictly required during installation to prevent engine damage.
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⚠️ Critical Cleaning Step:
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HEUI Warning: This system uses high-pressure engine oil to actuate fuel injection. You MUST change the engine oil, install a new oil filter, and flush the entire fuel system with a new fuel filter prior to installation. Contaminated oil will instantly damage the new injectors.
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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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⚖️ 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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