HEUI fuel injector 387-9433 for CAT C9 8.8L engine. Fits 330D, 336D excavators and D6R dozers. Advanced control valve coating. Global shipping available
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The Ruich Value 387-9433 is a premium HEUI fuel injector engineered for the Caterpillar C9 8.8L engine. Cross-referencing to 10R-7224, it directly resolves hard hot start issues and fits CAT 330D, 336D excavators and D6R dozers. In stock for global wholesale dispatch.
Heavy-duty earthmoving and construction equipment rely on the robust 8.8L diesel engine to deliver relentless torque. The Caterpillar C9 HEUI injector (OEM 387-9433) is the critical component responsible for metering and atomizing fuel under extreme pressures. By utilizing high-pressure engine oil to actuate the fuel delivery, this complex hydraulic-electronic unit injector ensures maximum power output and emission compliance for the CAT 330D excavator injector system and aggressive 140M motor grader applications.
Aging HEUI systems are notoriously vulnerable to fluid contamination and thermal breakdown. One of the most prevalent field issues is control valve erosion, where high-pressure oil gradually deteriorates the internal valve seat. This internal leak causes the engine to lose injection pressure when warm, requiring a definitive C9 hard hot start fix. Additionally, oil varnish buildup frequently causes HEUI spool valve stiction, resulting in severe cold start misfires. Our replacement injectors feature upgraded surface metallurgy and Diamond-Like Carbon (DLC) coatings to resist abrasive erosion and sticking, restoring smooth, factory-level combustion.
For independent engine rebuilders and heavy machinery fleets, securing exact-spec replacements is non-negotiable. As a specialized supplier of wholesale CAT injector components, Ruich Value provides rigorous flow-bench testing for every unit. This assembly seamlessly crosses over to the 10R-7224 and 10R-7222 remanufactured numbers. Whether you are executing a 336D fuel injector replacement or overhauling a D6R dozer injector arrangement, our factory-direct pricing eliminates dealership lead times while maintaining strict OEM performance standards.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 387-9433 / 3879433 |
| Engine Compatibility | Caterpillar C9 (8.8L Diesel) |
| System Type | HEUI (Hydraulic Electronic Unit Injector) |
| Actuation Mechanism | High-Pressure Engine Oil Actuated |
| ECU Calibration | Unique Trim Code Required |
| Internal Coating | Anti-Stiction Surface Treatment |
| Reman Cross-Reference | 10R-7224, 10R-7222, 20R-1917 |
Our heavy-duty diesel injection catalog extensively covers the Caterpillar engine lineage, spanning the C7 and C9 HEUI systems to the later Common Rail platforms. Explore our complete Caterpillar Categories for additional HEUI actuation pumps, sensor kits, and complete 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 Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | 330D / 330D L / 336D / 336D L | 2006–2014 | CAT C9 | Track Excavator |
| Caterpillar | D6R II / 814F II / 815F II | 2004–2014 | CAT C9 | Dozer / Compactor |
| Caterpillar | 140M / 160M | 2007–2014 | CAT C9 | Motor Grader |
| Caterpillar | 627G / 637G | 2004–2012 | CAT C9 | Wheel Scraper |
Answer: Yes. The 387-9433 is the standard new production OEM number for the Caterpillar C9 engine. The 10R-7224 (along with 10R-7222) is the official Caterpillar Remanufactured (Reman) part number for the exact same injector. Our units act as a direct, fully compatible replacement for all of these supersessions without requiring mechanical modifications.
Diagnosis: Due to microscopic manufacturing tolerances, no two HEUI injectors flow the exact same amount of fuel at a given electronic pulse width. To compensate, each unit is flow-benched at the factory and assigned a unique alphanumeric Trim Code. Solution: You must input this code into the engine’s ECM using a diagnostic tool (like CAT ET). Failing to do so will result in poor performance, severe knocking, and potentially melted pistons due to over-fueling.
Diagnosis: A hard hot start—where the engine starts perfectly when cold but cranks endlessly when warm—is the hallmark sign of internal HEUI control valve erosion. When the engine is hot, the actuation oil thins out. If the injector’s internal high-pressure oil valve is worn, the thin oil bleeds past the seal, preventing the injector from building the hydraulic pressure necessary to fire. Replacing the worn units restores the hydraulic seal.
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For Fuel Injector: Spare parts available – Nozzle, plunger, repair kits. Part number required for final confirmation.
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