Caterpillar C9 Fuel Injector
Core OEM Part Numbers: 10R-7222, 293-4573, 254-4330, 235-2888, 20R-8062 |
System: Hydraulically Actuated Electronically Controlled Unit Injection (HEUI) |
Engine Compatibility: CAT C9 Industrial/Marine/Construction Diesel Engines |
Application: Excavators (325C/330C), Bulldozers, Graders, Generators, Heavy Trucks
Product Overview
The Caterpillar C9 Fuel Injector is the precision-engineered heart of the C9 engine’s HEUI fuel system, delivering ultra-accurate fuel metering, timing, and atomization for optimal combustion, power delivery, and emissions control. Built to Caterpillar’s OEM standards for heavy-duty, 24/7 operation, it ensures consistent performance, fuel efficiency, and durability in construction, mining, marine, and power generation environments. Designed for seamless integration with Cat ADEM™ electronic control systems, it minimizes downtime and maximizes engine life.
Core Design & Engineering Features
HEUI System Architecture
- Operating Principle: Hydraulically actuated via high-pressure engine oil (27,600–31,000 psi / 1900–2140 bar) with electronic solenoid control for precise injection events
- Solenoid Actuation: Fast-response solenoid valve (≤50μs response time) for multi-pulse injection (pilot/main/post) to reduce noise, vibration, and emissions
- Nozzle Design: Precision-drilled multi-hole sac nozzle (8–10 holes) with optimized spray angle (150°–160°) for complete fuel atomization and uniform cylinder combustion
- Internal Components: Hard-coated plunger/barrel assembly (wear-resistant coating for up to 3x service life), precision control piston, and high-temp seals for leak-free operation
- Material: Forged heat-treated alloy steel with corrosion-resistant coating; IP69K dust/water ingress protection for harsh environments
Electronic Control & Calibration
- ECM Compatibility: Fully integrated with Cat ADEM™ IV engine control module for real-time fuel delivery, timing, and load-based adjustment
- Trim Code Calibration: Factory-calibrated with unique trim codes for cylinder-to-cylinder flow balance (±1% tolerance) to ensure smooth engine operation
- Diagnostics: On-board fault code detection for injector performance, leakage, and solenoid issues; compatible with Cat Electronic Technician (ET) software
- Dynamic Flow Range: Wide operating flow range (150–450 mm³/stroke) to match C9 engine power outputs (205–375 bkW / 275–503 bhp)
Technical Specifications
| Parameter |
Standard Value |
Notes |
| OEM Part Numbers |
10R-7222, 293-4573, 254-4330, 235-2888, 20R-8062 |
Primary/remanufactured variants |
| System Type |
HEUI (Hydraulically Actuated Electronically Controlled Unit Injection) |
C9 engine exclusive |
| Operating Pressure |
27,600–31,000 psi (1900–2140 bar) |
Hydraulic oil actuation pressure |
| Solenoid Resistance |
High-resistance: 13–18Ω; Low-resistance: 2–3Ω |
Match engine ECM requirements |
| Nozzle Holes |
8–10 precision-drilled holes |
0.18–0.22 mm diameter |
| Spray Angle |
150°–160° |
Optimized for C9 combustion chamber |
| Net Weight |
1.35–1.5 kg (3.0–3.3 lb) |
OEM assembly weight |
| Cycle Life |
≥1,000,000 injection cycles |
Heavy-duty continuous operation |
| Operating Temp |
-40°C to 125°C (-40°F to 257°F) |
Extreme environment tolerance |
| Sealing Class |
IP69K |
Dust/water/high-pressure washdown protection |
| Calibration Tolerance |
±1% flow balance |
Cylinder-to-cylinder consistency |
Performance & Durability
- Fuel Efficiency: Precise fuel metering reduces consumption by 5–8% vs. aftermarket injectors; optimized combustion lowers unburned fuel emissions
- Power Delivery: Consistent low-speed torque and high-rpm power for heavy-load applications (excavation, hauling, pumping)
- Wear Resistance: Hard-coated internal components resist scuffing from low-lubricity fuels; up to 3x longer service life than non-OEM alternatives
- Leakage Control: Precision-machined seals and zero-leakage design prevent fuel dilution of engine oil and premature component wear
- Vibration Resistance: Tested to 75g peak acceleration (ISO 16750-3) for stable operation in off-road conditions
Application Compatibility
Primary Equipment
- Construction: Excavators (325C, 328C, 330C, 330D), Bulldozers (D6N/D6R), Motor Graders (140M), Scrapers (627G/637G)
- Mining: Underground loaders, haul trucks, and stationary mining equipment
- Marine: Auxiliary propulsion and generator sets for workboats/tugs
- Power Generation: 200–375 kVA prime/standby generator sets
- Industrial: Heavy-duty pumps, compressors, and material handling equipment
Engine Serial Compatibility
- Compatible with C9 engine serial prefixes: JSC, JSD, KCA, KCB, MBP, MBR (verify via Cat Parts Catalog for exact match)
- The engine models I can offer:C7,C9,C13,C18,C27,C32,3116,3406E,3500,3516,3606,3608
Quality & Testing
- OEM Manufacturing: Built to Caterpillar ISO 9001 standards; 100% factory-tested for pressure, spray pattern, flow balance, and sealing
- Endurance Testing: Validated via 10,000+ hour field trials in extreme temperatures, vibration, and contamination conditionsCat
- Remanufactured Options: Cat Reman injectors (e.g., 20R-8968) meet OEM specs with 1-year warranty; restored to original flow rates and performance
- Warranty: 12-month / 2000-hour standard warranty; extended coverage available via Cat dealersCat
Installation & Service Guidelines
Pre-Installation
- Verify injector part number matches engine serial number and application
- Inspect fuel system for contamination; replace fuel filters (Cat 1R-0750) before installation
- Check hydraulic oil pressure and quality; ensure HEUI system is free of air bubbles
Installation
- Torque injector hold-down bolts to OEM specification (45–50 Nm / 33–37 lb-ft)
- Program trim codes via Cat ET software for cylinder calibration
- Prime fuel system and perform leak test before engine start
Maintenance
- Inspect injectors every 1500 hours for leakage, spray pattern, and solenoid resistance
- Replace injectors at 6000–8000 hours (or per Cat maintenance schedule)
- Use only Cat genuine fuel filters to prevent injector contamination and premature wearCat
Why Choose Cat C9 OEM Injectors?
- Unmatched Precision: OEM calibration ensures optimal engine performance and fuel efficiency
- Superior Durability: Hard-coated components and rigorous testing deliver long service life
- Seamless Integration: Fully compatible with Cat HEUI and ADEM™ systems for reliable operation
- Global Support: Cat dealer network for parts, service, and technical support worldwide
- Cost Savings: Reduced downtime, lower fuel consumption, and extended engine life minimize total cost of ownership
