Caterpillar C7 HEUI Injector 387-9427 (10R-4761)

Restore C7 ACERT Power: Caterpillar HEUI Injector for Industrial Diesel Engine Parts

As a specialized component in our wholesale Industrial Diesel Engine Parts inventory, this Caterpillar C7 Fuel Injector (Part No: 387-9427) features the proprietary HEUI (Hydraulic Electronic Unit Injector) technology required for CAT C7 ACERT engines. Unlike standard common rail systems, this unit relies on high-pressure engine oil for actuation, necessitating precision-machined internal tolerances. We support fleet maintenance directors and heavy equipment distributors with a reliable, calibrated solution that restores firing pressure and eliminates the “cold start stiction” issues common in high-hour machines.

This injector addresses critical failure modes such as spool valve sticking and intensifier piston wear, which often manifest as erratic idling or power loss under load. Whether you are troubleshooting a CAT 324D Excavator or overhauling a 950H Wheel Loader, this unit serves as a direct-fit replacement for OEM 387-9427 and Reman 10R-4761. It is engineered to meet the exact hydraulic flow rates required for Tier 3 / Stage IIIA emissions compliance in heavy construction environments.

387-9427 HEUI Injector Technical Specifications

Technician’s Note: Installation & Inspection

Technician’s Note: The lifespan of a C7 HEUI injector is entirely dependent on the cleanliness of the engine oil. Before installing 387-9427, you MUST verify the condition of the High-Pressure Oil Pump (HPOP). If the old injectors failed due to metal contamination, the entire high-pressure oil rail must be flushed, or the new injectors will seize immediately. Always use new O-rings and torque the hold-down clamp to spec to prevent fuel dilution in the crankcase.

Compatible Equipment for Caterpillar C7 ACERT

Why Source Industrial Diesel Engine Parts from Ruich Value?

• Spool Valve Precision: We use upgraded materials for the spool valve coils and plungers to minimize magnetic “stiction.”
  Solves: Prevents the notorious cold-start misfires where the injector fails to fire until the oil warms up.
• Intensifier Piston Durability: The internal piston is hardened to withstand oil pressures exceeding 3,000 PSI.
  Solves: Eliminates internal oil leakage that causes sluggish throttle response and high oil consumption.
• O-Ring Integrity: All units are supplied with premium Viton external seals pre-installed.
  Solves: Prevents diesel fuel from leaking into the engine oil sump (fuel dilution), protecting the main bearings.
• Comprehensive Testing: Every HEUI unit is tested on a specialized test bench for response time (RT) and delivery quantities (VOP).
  Solves: Ensures cylinder-to-cylinder balance for a smooth idle on C7 ACERT engines.
• Stock Availability: We maintain inventory of the critical 10R-4761 / 387-9427 numbers for immediate dispatch.
  Solves: Reduces machine downtime for excavators and loaders critical to project timelines.

Complete Caterpillar HEUI & Common Rail Catalog

Our inventory extends far beyond the C7 series, covering a comprehensive range of Industrial Diesel Engine Parts for Caterpillar’s diverse fuel systems. We supply injectors for both the hydraulically actuated (HEUI) and mechanically actuated (EUI) platforms.

Category coverage: Wholesale supply for Caterpillar 3126B, C9, C10, C12, C13, C15, and C18 engines.

View all specs in our Caterpillar Diesel Fuel Injector Catalog.

Or explore our complete Caterpillar Industrial Diesel Engine Parts Catalog

Technical FAQ: Caterpillar 387-9427 Injector

Q: Is this a Common Rail injector?

A: No. The 387-9427 is a HEUI (Hydraulic Electronic Unit Injector). It uses high-pressure engine oil (supplied by the HPOP) to pressurize the fuel inside the injector. It is NOT compatible with Common Rail engines (like the C6.4 or C7.1). Please verify your engine serial number prefix.

Q: Do I need to enter a Trim Code for this C7 injector?

A: Yes. C7 ACERT injectors typically have a Trim File (calibration code) listed on the top of the solenoid or on a CD/QR code. This code must be uploaded to the engine ECU using Caterpillar ET software to balance the fuel delivery. Failure to trim the injectors may result in rough idle or uneven power.

Q: Does this replace the older 10R-4761?

A: Yes. 10R-4761 is the Caterpillar Remanufactured part number, while 387-9427 is the “New” part number. Our Ruich Value replacement is fully interchangeable with both numbers and also replaces earlier supersessions like 263-8218.

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