387-9427 HEUI injector for CAT C7 7.2L engine. Fits 324D, 325D excavators and 950H loaders. Upgraded anti-stiction valves. Workshop and fleet supply
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The Ruich Value 387-9427 is a premium HEUI fuel injector engineered for the Caterpillar C7 7.2L diesel engine. Serving as a direct replacement for 10R-4761, it resolves hard hot starts in CAT 324D, 325D excavators, and 950H loaders. Workshop and fleet supply ready.
The Caterpillar C7 7.2L engine is a mainstay in mid-sized earthmoving machinery and commercial trucking. To deliver its massive torque, this platform relies entirely on the Caterpillar 387-9427 HEUI injector. By utilizing high-pressure engine oil to actuate fuel delivery, this complex Hydraulic Electronic Unit Injector dictates the power and efficiency of the entire system. Ruich Value manufactures this high-precision C7 HEUI injector to restore factory combustion performance for rigorous CAT 324D excavator injector applications.
In heavy-duty construction cycles, the C7’s fuel system is highly susceptible to fluid contamination. The most prominent failure is control valve erosion caused by dirty engine oil or poor fuel quality. This internal scoring leads to a severe C7 hard hot start condition, where the injector bleeds off actuation pressure when the oil is warm and thin. Our replacement 10R-4761 injector assemblies are fortified with DLC coated valves (Diamond-Like Carbon) to permanently eliminate injector stiction and internal high-pressure bypass.
For equipment rebuilders, precise fuel metering is non-negotiable. As a trusted source for wholesale CAT injector components, every unit is dynamically flow-tested across idle, emission, and full-load states. Whether you are performing a complete 950H wheel loader injector replacement or servicing a commercial Caterpillar C7 engine rebuild, our assemblies include factory-verified trim codes to ensure perfect ECU synchronization and vibration-free operation.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 387-9427 / 3879427 |
| Engine Compatibility | Caterpillar C7 (7.2L Inline-6) |
| System Type | HEUI (Hydraulic Electronic Unit Injector) |
| Actuation Fluid | High-Pressure Engine Oil |
| Internal Upgrades | Diamond-Like Carbon (DLC) Coating |
| ECU Calibration | Unique Trim Code Required |
| Reman Cross-Reference | 10R-4761, 10R-4762, 238-8091 |
Our heavy-duty diesel injection catalog extensively covers the Caterpillar engine lineage, spanning the C7 and C9 HEUI systems to modern Common Rail platforms. Explore our complete Caterpillar Categories for additional HEUI actuation pumps, sensor kits, and master engine overhaul components.
| Premium OEM | Cro. Ref. P/N / Reman | Application Engine | System Type | Application Vehicle |
|---|---|---|---|---|
| 326-4700 | 10R-7675 | Caterpillar C6.4 | Common Rail (Denso) | CAT 320D, 323D Excavators |
| 320-4740 | 10R-7676 | Caterpillar C4.2 | Common Rail (Denso) | CAT 315D, 318D, 319D Excavators |
| 2645A749 | 320-0690 | Perkins 1106C; CAT C6.6 | Common Rail (Denso) | JCB JS200; CAT 924H, 938H Loaders |
| 2645A747 | 320-0680 | Perkins 1106D; CAT C6.6 | Common Rail (Denso) | CAT 120M Grader; Industrial Gensets |
| 2645A753 | 321-3600 | Perkins 1106D; CAT C6.6 | Common Rail (Denso) | Caterpillar 428E Backhoe Loader |
| 387-9427 | 10R-4761, 263-8218 | Caterpillar C7 ACERT | HEUI (Hydraulic) | CAT 324D, 325D, 329D, 950H |
| 387-9433 | 10R-7224, 254-4399 | Caterpillar C9 ACERT | HEUI (Hydraulic) | CAT 330D, 336D Excavators |
| 371-3974 | 0445120347 | Caterpillar C9 | Common Rail (Bosch) | CAT 336E (Newer Series), Loaders |
| 10R-7222 | 0445110126 | Caterpillar C7 / C7.1 | Common Rail (Bosch) | CAT 320E, 323E, Industrial Apps |
| 4W-7018 | / | Caterpillar 3406, 3408 | Mechanical (Pencil) | CAT D8K, D9, Trucks (Mechanical) |
| 8N-7005 | / | Caterpillar 3304, 3306 | Mechanical (Pencil) | CAT D6D Dozer, 966C Loader, 12G |
| 127-8216 | / | Caterpillar 3116 | Mechanical (MUI) | CAT 320B, 322B, 325B Excavators |
| 127-8222 | / | Caterpillar 3116 | Mechanical (MUI) | CAT 950F, 960F Loaders |
| Make | Machine / Truck Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | 324D / 325D / 329D | 2006–2014 | CAT C7 | Track Excavator |
| Caterpillar | 950H / 962H | 2005–2014 | CAT C7 | Wheel Loader |
| Caterpillar | 120K / 12K / 140G | 2008–2018 | CAT C7 | Motor Grader |
| Freightliner / Ford | M2 106 / F-650 | 2004–2009 | CAT C7 | Medium Duty Truck |
Diagnosis: A hard hot start—where the C7 engine starts perfectly when cold but cranks endlessly when warm—is the hallmark sign of internal HEUI control valve wear. When the engine is hot, the actuation oil thins out. If the injector’s internal poppet valve is eroded, the thin oil bleeds past the seal, preventing the injector from building the 800+ PSI hydraulic pressure necessary to fire. Replacing the worn units with our DLC-coated assemblies restores the hydraulic seal.
Answer: Yes. The 387-9427 is the standard new production OEM number for the Caterpillar C7 engine. The 10R-4761 (along with 10R-4762) is the official Caterpillar Remanufactured (Reman) part number for the exact same unit. Our injectors act as a direct, fully compatible replacement for all of these supersessions without requiring mechanical modifications.
Answer: Yes, absolutely. Due to microscopic manufacturing tolerances, no two HEUI injectors flow the exact same amount of fuel at a given electronic pulse width. You must input the unique Trim Code (printed on the new injector) into the engine’s ECM using a diagnostic tool (like CAT ET). Failing to do so will result in cylinder imbalance, severe engine knocking, and potentially melted pistons due to over-fueling.
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For Fuel Injector: Spare parts available – Nozzle, plunger, repair kits. Part number required for final confirmation.
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