Restore C6.6 engine performance with the Caterpillar 320-0680 Injector (2645A747), a precision-calibrated replacement for applications including 120M graders, stocked for global dispatch
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As a staple component within our wholesale Industrial Diesel Engine Parts catalog, this Caterpillar 320-0680 Common Rail Injector is engineered specifically for the C6.6 ACERT engine platform found in mid-range construction equipment. We support fleet maintenance directors and parts distributors with a high-fidelity fuel system solution that matches the stringent flow tolerances required by Tier 3 emissions standards.
This injector addresses the common “hard hot start” and rough idle issues often caused by control valve seat erosion in high-hour engines. Whether you are troubleshooting a CAT 120M Motor Grader or servicing applications such as wheel loaders, paving equipment, and industrial power units, this unit serves as a direct-fit replacement for the OEM 320-0680 and Perkins 2645A747. It is fully compatible with the Denso common rail system used on these machines.
| Part Name | Common Rail Diesel Fuel Injector |
| Engine Platform | Caterpillar C6.6 ACERT / Perkins 1106D |
| System Producer | Denso Common Rail System |
| Cross Reference / OEM |
|
| Application Category | Industrial Diesel Engine Parts |
Technician’s Note: The C6.6 fuel system is highly sensitive to contamination. When replacing the 320-0680 injector, you must replace the high-pressure fuel supply tubes (quill tubes) simultaneously. Reusing old tubes often results in leaks at the injector inlet due to metal deformation. Additionally, check the ECU for any existing trim codes and be prepared to input the new correction code found on the injector head.
| Machine Type | Application Field | Equipment Models |
|---|---|---|
| Motor Grader | Road Construction |
|
| Wheel Loader | Material Handling |
|
| Paving Compactor | Infrastructure |
|
Our inventory extends far beyond the C6.6 series, covering a comprehensive range of Industrial Diesel Engine Parts for various Caterpillar fuel systems. We supply injectors for Common Rail, HEUI, and EUI applications.
Category coverage: Wholesale supply for Caterpillar C4.4, C6.4, C7, C9, C15, and C18 engines.
| 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: Generally, no. While they look identical and both fit the C6.6 engine, they have different flow rates tailored for different power ratings (e.g., 120M Grader vs. 938H Loader). Installing the wrong part number can lead to low power or excessive exhaust temperatures. Please stick to the specific part number listed in your parts manual.
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, we recommend inputting it for immediate idle optimization.
A: Yes. The Caterpillar C6.6 is essentially a re-badged Perkins 1106D. The CAT part number 320-0680 corresponds directly to Perkins 2645A747. Our injector is compatible with both engine brands provided the part number matches.
We also supply repair kits, nozzles, and cartridges for bulk fleet maintenance orders.
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For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business
