CAT 293-4573 HEUI Injector – The Field-Proven High-Efficiency Solution for C7 & C9 Diesel Engines
1. Product:293-4573
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
- Fast Delievery
- Quality Assurance
- 24/7 Customer Service
Product Introduction
The CAT 293-4573 is not a novel design but rather the culmination of iterative improvements derived from millions of operating hours across C7 and C9 engine platforms worldwide. This injector represents the "field-hardened" evolution of the HEUI concept – incorporating material upgrades, revised hydraulic geometries, and enhanced sealing systems that have been validated through exhaustive testing in vocational, marine, and generator applications. With a maximum injection pressure of 1,520 bar (22,050 psi) and a static flow of 220 mm³/stroke at 1,400 rpm, the 293-4573 delivers the fuel volumes required for both standard and high-output C7 and C9 engines. The defining performance metric of this injector is its long-term flow stability – a deviation of less than ±2.0% from nominal delivery over 6,000 operating hours, a tolerance that ensures consistent combustion characteristics and stable emissions performance throughout the injector's service life.
█ Application Coverage – C7 & C9 Engine Platforms
The 293-4573 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
The injector features an 8-hole nozzle with 0.268 mm diameter orifices and a 147° spray angle, providing a droplet SMD of approximately 22 µm. It directly replaces CAT part numbers 293-4572, 524-4330, 269-1839, 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 |
| Long-Term Flow Stability | ±2.0% over 6,000 hrs |
| 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 |
| Service Interval (2 µm filtration) | 8,000–10,000 hrs |
The 6.35:1 intensifier ratio provides the flow-adaptive characteristic that enables this injector to serve both standard and high-output calibrations without requiring ECM recalibration. The 2.05 mH inductance delivers a 280 µs pull-in time, ensuring accurate injection timing at the 2,800 rpm governed speed.
◆ Construction Details – The Field-Hardened Design
→ Revised Intensifier Piston Crown: The piston features a new profile that distributes the intensification load more evenly across the plunger surface, reducing peak contact stress by 18%.
→ Ceramic-Reinforced Actuation Oil Seal: The Teflon seal incorporates 15% ceramic particles, providing creep resistance at actuation oil temperatures up to 135°C.
→ Cermet-Plated Plunger: The plunger receives a tungsten-carbide/cobalt cermet coating (1,200 HV), providing wear resistance against abrasive particles.
→ Tin-Bronze Armature Guide: The armature bushing is manufactured from a CuSn12 bronze alloy, providing a 40% reduction in bushing wear compared to earlier designs.
→ Enhanced Control Valve: The ball-and-seat control valve is manufactured from a powder-metal alloy with 15% chromium content, providing 50% higher erosion resistance.