Extrusion line record
Caterpillar C7 C9 HEUI Fuel Injector 387-9433 for Excavators and Loaders
Caterpillar HEUI hydraulic electronic unit injector 387-9433 (3879433) for CAT C7 and C9 engines in excavators, loaders and other machine applications.
Machine specification
Output, material and line configuration in one view.
Die set, cooling, speed and packing notes remain visible for plant buyers.
| Part Number | 387-9433 (3879433) |
|---|---|
| Type | HEUI Hydraulic Electronic Unit Injector |
| Application | Caterpillar C7, C9 engines in excavators and loaders |
Product Detail
Caterpillar C7 C9 HEUI Injector 387-9433
387-9433 is a Caterpillar HEUI hydraulic electronic unit injector for CAT C7 and C9 engines. On a HEUI system the injector is actuated by high-pressure engine oil rather than by a camshaft, so the complete assembly is replaced when the nozzle or intensifier wears.
Where This Injector Is Used
- Part number: 387-9433 (3879433)
- Type: HEUI hydraulic electronic unit injector
- Application: Caterpillar C7 and C9 engines in excavators, loaders and other machine applications
Injector Specifications
| Item | Value |
|---|---|
| Part number | 387-9433 (3879433) |
| Type | HEUI hydraulic electronic unit injector |
| Application | Caterpillar C7, C9 engines |
Why HEUI Injectors Are Replaced
On a HEUI injector the oil side and the fuel side both wear. The intensifier piston and the nozzle seat degrade with running hours, so the injected quantity drifts from the value the ECU expects. Operators notice hard starting, a rough idle, falling power and smoke, and the ECU eventually stores a correction-limit fault.
Fitting Notes
- Confirm the number on the original injector before ordering; HEUI injectors are matched to the engine variant.
- Check the oil rail and injector O-rings for damage and renew the copper washer.
- Recode the injector where the engine management requires it.
Supply and Service
MOQ 1 piece. Neutral, original or customised packaging available.
Request a line quote
Send material, output and plant requirements.
We will prepare a line, tooling and commissioning route.