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Cat® 387-9433 Fuel Injector Assembly for C9 Engines and 330D/336D Series Excavators

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  2. Cat® 387-9433 Fuel Injector Assembly for C9 Engines and 330D/336D Series Excavators
Cat® 387-9433 Fuel Injector Assembly for C9 Engines and 330D/336D Series Excavators

Enhance your C9 engine's performance with the Cat® 387-9433 Fuel Injector Assembly. Designed for Caterpillar 330D and 336D excavators, this injector offers precision fuel delivery, meeting high-pressure performance and emission standards. Built with proprietary metallurgy for long-term durability. Available for worldwide B2B export.

Cat 387‑9433 Fuel Injector — Precision HEUI Fuel Injection Assembly for CAT C9 ACERT

Cat® 387‑9433 Fuel Injector — Precision HEUI Fuel Injection Assembly for CAT C9 ACERT

The Cat® 387‑9433 Fuel Injector Assembly is a high‑precision HEUI‑type (Hydraulic Electronic Unit Injector) fuel‑system component exclusively engineered for Caterpillar C9 ACERT diesel engines. It delivers precise‑timing, ultra-high‑pressure fuel injection with micro‑level accuracy. Fabricated from proprietary high‑wear‑resistant alloy steel and subjected to stringent precision machining, it is built to withstand relentless injection pressures and cyclic thermal fatigue. This ensures full compliance with Tier‑3 / Stage IIIA emission regulations while maintaining uncompromised peak power output for heavy‑duty industrial equipment.

1. Core Advantages

  • Ultra‑Fine Fuel Atomization: Features an optimized multi‑hole spray nozzle profile that achieves a highly uniform fine‑mist spray pattern, optimizing air-fuel mixture combustion, maximizing thermal efficiency, and lowering in-cylinder carbon build-up.

  • Thermal Stress-Resistant Alloy Steel: The injector body and nozzle assembly are cast from an exclusive Cat-grade alloy compound that robustly resists internal high-pressure fuel erosion, cavitation damage, and high-load thermal fatigue.

  • Harsh Environmental Adaptability: Delivers unwavering performance profiles even when operating in high-vibration engine configurations or with variable global diesel fuel qualities.

  • ECM-Matched Precision Calibration: Every single unit undergoes rigorous bench flow testing and calibration. Precise injection mapping signals match the engine's Electronic Control Module (ECM) flawlessly to ensure smooth idle speeds and instantaneous load responses.

2. Technical Specifications

Technical ParameterImperial Size SpecificationMetric Size Specification
Primary Part Number387‑9433387‑9433 (3879433)
Applicable Core Engine PlatformsCaterpillar C9 & C9 ACERT Heavy-Duty Diesel Series
Total Injector Height5.3 in134.6 mm
Overall Enclosure Length14.2 in360.7 mm
Injection System ArchitectureHEUI (Hydraulic‑Electronic Unit Injection) System
Core Mechanical FunctionPrecision Multi-Stage Fuel Atomization & Injection‑Timing Delivery Control

3. Machine Compatibility & Fleet Integration

This high-precision HEUI injector assembly interfaces directly with a broad spectrum of CAT heavy civil construction, infrastructure, and forestry machinery powered by the C9 ACERT platform:

  • Hydraulic Crawler Excavators: 330D, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 336D2, 336D2 L.

  • Precision Motor Graders: 140M, 140M2, 160M, 160M2, 14L Heavy‑Duty Graders.

  • Tracked Forestry Equipment: 521, 521B, 522B, 541, 551, 552 Series Feller Bunchers.

  • Soil/Vibratory Compactors: 815F II and 816F II Vibratory Soil Compactors.

  • Wheel Dozers & Earthmoving Scrapers: 814F II Wheel Dozers, alongside 627G, 637D, 637E, and 637G Earthmoving Scrapers.

  • Industrial Specialty Configurations: C9 Industrial Power Units, Petroleum-Duty Modules, and Truck Diesel Engines.

4. Field Technical Note & HEUI Installation Protocol

Critical Strategy for Heavy-Duty Engine Technicians:
• Actuation Oil Cleanliness: HEUI systems rely on high-pressure engine oil to stroke the internal fuel intensifier plunger. Absolute oil cleanliness is critical. Prior to dropping in new 387‑9433 injectors, always renew the engine oil and replace the primary hydraulic/lubrication filters. Particulate contaminants in the engine oil will immediately jam or score the precision spool valves inside the injector head.
• Sealing & O-Ring Pre-Lubrication: Always replace the external rubber sealing o-rings and copper combustion washers during an injector swap out. Lightly coat the new o-rings with clean engine oil before installation to avoid tearing or shearing the rubber seals as the injector assembly is seated into the cylinder head bore.

5. Commercial Reference & Global Supply Channels

  • Supplier Identification: Xuzhou Sinoswift Import & Export Co., Ltd.

  • Contact/Mobile Support: +86 13701956981

  • Email Address: [email protected]

  • Commercial Supply Frame: Minimum Order Quantity (MOQ): 1‑6 PCS | Factory Warranty Window: 6 Months

  • Packaging & Logistics: Sealed, Moisture-Proof Anti-Static Packaging protectives. Complete logistics framework supporting Ocean Freight (FCL/LCL), Expedited Air Freight, and Worldwide Industrial Express Delivery options.

All original equipment manufacturer names, registered trademarks, logo configurations, and machine model series numbers are utilized strictly for field compatibility cross-mapping and unit installation alignment verification. Eradicate engine misfires, restore your machine's cylinder balance, and cut exhaust emissions. Contact our commercial inquiry service desk today to secure immediate bulk wholesale pricing and automated factory delivery logs!

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