CAT 269-1839 HEUI Injector – High-Cycle Durability for C7 & C9 Heavy-Duty Diesel Power Systems
1. Product: 269-1839
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
While peak injection pressure and static flow are the headline figures for most injectors, the CAT 269-1839 distinguishes itself through a fundamental refinement in its hydraulic control circuit – a revised ball-and-seat control valve geometry that delivers pilot injection quantities with a consistency of ±0.10 mm³, a 33% improvement over the 10R-1265. This precision is critical for C7 and C9 engines operating in vocational applications where stable idle quality and low combustion noise directly impact driver comfort and equipment longevity. With a maximum injection pressure of 1,520 bar (22,050 psi) and a static flow of 220 mm³/stroke at 1,400 rpm, this injector provides the fuel delivery required for both standard and high-output engine ratings. The defining specification of the 269-1839 is its high-cycle durability – the control valve is manufactured from a new powder-metal alloy that provides a 50% increase in erosion resistance compared to the 236-4072, extending the injector's service interval in continuous high-load applications such as generator sets and marine auxiliary power.
█ Application Coverage – C7 & C9 Engine Platforms
The 269-1839 is the factory-specified service injector for the following Caterpillar engine applications:
C7 Engine – All serial numbers, including vocational, generator, and marine configurations
C9 Engine – All ratings, including high-output variants up to 350 hp
Industrial Power Units – C7/C9 in generator sets, pumps, and compressors
Vocational Applications – Refuse, dump, mixer, fire apparatus, and emergency vehicles
Marine Auxiliary – C9 propulsion and generator applications in workboats
The injector's 8-hole nozzle features 0.268 mm diameter orifices and a 147° spray angle, providing a droplet SMD of approximately 22 µm. It directly replaces CAT part numbers 269-1838, 524-4330, 258-8745, 236-4072, 0R-9803, 10R-1265, and 10R-1266 across all C7 and C9 serial numbers.
▐ Technical Specifications – Electrical and Hydraulic Data
| Parameter | Specification |
|---|---|
| Maximum Injection Pressure | 1,520 bar (22,050 psi) |
| Actuation Oil Pressure Range | 380 – 2,100 psi |
| Intensifier Ratio | 6.35:1 |
| Fuel Delivery @ 1,400 rpm | 220 mm³/stroke |
| Fuel Delivery @ 1,800 rpm | 203 mm³/stroke |
| Pilot Quantity Variation | ±0.10 mm³ (33% improvement over 10R-1265) |
| Solenoid Coil Resistance (20°C) | 0.88 – 1.05 Ω |
| Peak Pull-in Current | 22 A |
| Nozzle Holes / Diameter | 8 × 0.268 mm |
| Spray Angle | 147° |
| Needle Lift | 0.23 mm |
| Hydraulic Opening Pressure | 275 bar |
| Leak-off Rate (new, idle) | ≤ 20 ml/min |
| Max. Engine Speed | 2,800 rpm |
| Solenoid Inductance | 2.05 mH |
| Control Valve Erosion Resistance | 50% improvement over 236-4072 |
| Service Interval (2 µm filtration) | 8,000–10,000 hrs |
◆ Construction Details – The Control Valve Refinement
→ Powder-Metal Control Valve: Manufactured from a new powder-metal alloy with 15% chromium content, providing erosion resistance 50% higher than conventional steel valves.
→ Cermet-Plated Plunger: Tungsten-carbide/cobalt coating (1,200 HV) for wear resistance.
→ Carbon-Fibre-Reinforced Actuation Oil Seal: Teflon seal with carbon-fibre reinforcement for creep resistance at high temperatures.