| OEM Part Numbers | 6156-11-3300 / 6156-11-3301 |
| Brand | COGENG (Premium OEM Replacement) |
| Injector Type | Electronic Fuel Injector (EUI) |
| Engine Model | Komatsu 6D125 Series |
| Compatible Models | Komatsu PC400-7, PC450-7 Excavators |
| Symptoms Solved | Low power, black smoke, rough idle, high fuel consumption, hard starting |
| Key Feature | Precision electronic control for optimal fuel delivery and combustion |
| Parameter | Specification |
|---|---|
| Actuation Type | Solenoid Operated Electronic Control |
| Coil Resistance | 0.8 - 1.2 Ω @ 20°C |
| Peak Current | 25A ± 2A |
| Hold Current | 12A ± 1A |
| Response Time | < 0.5 ms |
| Duty Cycle | Intermittent (Injection Event) |
| Parameter | Specification |
|---|---|
| Injection Type | High-Pressure Direct Injection |
| Maximum Rail Pressure | 1,600 bar (23,200 psi) |
| Nozzle Configuration | 6 holes × 0.16mm |
| Spray Angle | 148 degrees |
| Static Flow Rate | 580 cc/min @ 100 bar |
| Injection Timing | ECU Controlled Variable |
| Parameter | Specification |
|---|---|
| Overall Length | 195 mm |
| Body Diameter | 24 mm |
| Mounting Thread | M16 × 1.5 |
| Clamp Bolt Torque | 65 ± 5 Nm |
| Fuel Inlet Fitting | M14 × 1.5 |
| Weight (Each) | 0.78 kg |
| Component | Material Specification |
|---|---|
| Injector Body | Case-Hardened Nickel-Chrome Steel |
| Nozzle Needle | High-Speed Tool Steel (HSS) |
| Solenoid Coil | High-Temperature Copper Winding |
| Plunger Assembly | Ceramic-Coated Stainless Steel |
| Sealing Washer | Annealed Copper (Replaceable) |
| O-Rings | Viton (FKM) - High Temp Resistant |
| Equipment Model | Application | Injector P/N |
|---|---|---|
| PC400-7 | Hydraulic Excavator (40-ton) | 6156-11-3300 / 3301 |
| PC400LC-7 | Long Track Excavator | 6156-11-3300 / 3301 |
| PC450-7 | Hydraulic Excavator (45-ton) | 6156-11-3300 / 3301 |
| PC450LC-7 | Long Track Excavator | 6156-11-3300 / 3301 |
| PC400-8 | Newer Series (Check compatibility) | 6156-11-3300 / 3301 |
| Parameter | 6D125 Engine |
|---|---|
| Cylinders | 6 in-line |
| Displacement | 11.05 L (11,050 cc) |
| Power Output | 257-300 kW (345-402 HP) |
| Fuel System | Common Rail (High Pressure) |
| Emission Standard | Tier 3 / Stage IIIA |
| Feature | Benefit |
|---|---|
| 6-Hole Nozzle | Superior fuel atomization for complete combustion |
| Variable Injection Timing | Optimized performance across RPM range |
| Multiple Injection Events | Pilot, main, and post injection capability |
| Fast Solenoid Response | Precise fuel metering for reduced emissions |
| Ceramic Plunger Coating | Extended wear life and corrosion resistance |
100% Individual Testing: Each injector tested for:
Spray pattern visualization
Dynamic flow rate at multiple pressures
Solenoid response time
Leakage (internal and external)
Coil resistance verification
Traceability: Laser-etched batch code and date code on each unit
Certifications: ISO 9001:2015, IATF 16949 compliant manufacturing
Frequently Asked Questions
Q: What are symptoms of a failing electronic injector on a Komatsu PC400-7?
A: Common signs include noticeable loss of engine power under load, excessive black smoke from the exhaust, rough idling or engine misfire, increased fuel consumption, and difficulty starting. The 6D125 engine's ECU may also log fault codes specific to injector circuit malfunctions.
Q: Are 6156-11-3300 and 6156-11-3301 interchangeable?
A: Yes, these two part numbers refer to functionally equivalent electronic fuel injectors for the Komatsu 6D125 engine. Both are direct OEM replacements for PC400-7 and PC450-7 excavators. Verify the part number on your original injector to confirm exact match.
Q: Does this injector require programming or calibration after installation?
A: Electronic unit injectors (EUI) on the 6D125 engine typically require injector trim code programming using Komatsu diagnostic software to ensure precise fuel delivery calibration. Failure to program the correct trim codes may result in rough running, reduced power, or active fault codes. Please consult your service manual or a qualified technician for proper installation procedures.
Contact COGENG
📞 Phone: +86-185-2913-1515
📧 Email: hugo@cogeng.net
💬 WhatsApp +86-185-2913-1515
💬 WeChat: +86-185-7865-1106
🌐 Website: cogeng.net
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