Fully interchangeable with CAT 320-0690, this Perkins 2645A749 Injector offers a direct-fit solution for C6.6 engines in 924H loaders and 120M graders, stocked for global dispatch
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As a versatile component in our wholesale Industrial Diesel Engine Parts catalog, this Common Rail Fuel Injector (Part No: 2645A749 / 320-0690) is engineered for the widespread Caterpillar C6.6 ACERT and Perkins 1106-Series engine platforms. We support heavy equipment distributors and engine rebuilders with a dual-application solution that bridges the gap between Perkins engine technology and Caterpillar machine fitment, ensuring precise fuel delivery for mid-range industrial power.
This injector addresses the specific sensitivity of the C6.6 fuel system to debris and wear, solving common issues like high fuel return rates and rough idle. Whether you are servicing a Caterpillar 938H Wheel Loader or a Perkins-powered JCB excavator, this unit serves as a direct, drop-in replacement for OEM 2645A749 and CAT 320-0690, providing the atomization efficiency required for Tier 3 / Stage IIIA emissions compliance.
| Part Name | Common Rail Diesel Injector |
| Engine Platform | Caterpillar C6.6 / Perkins 1106D-E66TA |
| Fuel System | Common Rail (CR) |
| Cross Reference / OEM |
|
| Application Category | Industrial Diesel Engine Parts |
Technician’s Note: The C6.6 engine’s common rail system is unforgiving of contamination. Before installing the 2645A749 injector, you must flush the fuel rail and replace the fuel filters. Do not attempt to clean the nozzle tip with a wire brush, as this will alter the spray angle and cause piston hot spots. Always verify if the correction code (Trim Code) needs to be updated in the ECU to balance cylinder performance.
| Machine Brand | Application Field | Equipment Models |
|---|---|---|
| Caterpillar | Wheel Loader |
|
| Caterpillar | Motor Grader |
|
| Perkins / JCB | Construction |
|
Our inventory extends far beyond the C6.6 series, covering a comprehensive range of Industrial Diesel Engine Parts for mid-range and heavy-duty applications. We supply fuel systems for the full CAT and Perkins lineup.
Category coverage: Wholesale supply for Caterpillar C4.4, C6.4, C7, C9, and Perkins 1104, 1106 series.
| 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 |
View all specs in our Caterpillar Diesel Fuel Injector Catalog.
A: Yes, they are physically and functionally identical. Perkins manufactures the base engine (1106 series) for Caterpillar (rebranded as C6.6). 2645A749 is the Perkins number, and 320-0690 is the Caterpillar part number assigned to the same component. Our Ruich Value replacement fits both applications perfectly.
A: It depends on the specific production batch. Our injectors are manufactured to strict OEM tolerances to ensure a standardized flow rate. In many cases, they are “plug-and-play” ready, allowing the C6.6 ECU to adapt to the new injector through its self-learning cycle. However, if a specific trim code is provided on the injector body or test sheet, we recommend inputting it for immediate idle optimization.
A: No. The C6.4 engine uses a different injector (typically 326-4700). The C6.6 injector (2645A749) has different dimensions and flow characteristics. Installing the wrong injector can cause severe engine damage. Please confirm your engine model is C6.6 or Perkins 1106.
We also supply control valves, nozzles, solenoids, and other repair kits for bulk fleet maintenance orders
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