EX550-3 excavator ECU computer board 9140451

Hitachi EX550-3 large ECU controller replacement

9140451 engine and hydraulic system controller

Heavy-duty excavator ECU main board EX550-3

YNF16803 9140451 large version controller for EX550-3

YNF16803 electronic control unit for Hitachi excavators

Large-size computer controller board for EX550 series

Replacement ECU 9140451 for EX550-3 machine performance control

YNF16803 9140451 Controller EX550-3 Excavator ECU Computer Board (Large Version)

YNF16803 controller (9140451) ensures stable engine and hydraulic performance for Hitachi EX550-3 excavators, ideal for B2B excavator parts distributors.

OEM-equivalent replacement for 9140451 large-size controller
Designed for Hitachi EX550-3 electronic management system
Enhanced circuitry for heavy-duty excavation cycles
High durability against vibration, dust, moisture, and heat
Direct-fit installation with stable signal processing

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EX550-3 Controller Description

The YNF16803 controller, corresponding to OEM part 9140451, is the large-version ECU used on Hitachi EX550-3 excavators. This upgraded controller board is built to manage high-load engine response, hydraulic synchronization, and full-system communication with improved stability. The large-size structure offers enhanced processing capacity, enabling better thermal tolerance and stronger electrical stability during long working hours.

Manufactured with industrial-grade PCB materials and reinforced protective components, this controller is widely adopted by excavator repair centers, fleet operators, and global aftermarket distributors. It helps eliminate frequent ECU-related issues such as unstable engine output, hydraulic lag, system warning alarms, or diagnostic communication errors.

Installing the YNF16803 controller restores machine performance to OEM standards, extending equipment operating life and ensuring reliable productivity in quarrying, mining, foundation construction, and heavy-load excavation.

EX550-3 Controller Technical Sheet

Parameter	Details
YNF Part Number	YNF16803
OEM Number	9140451
Version	Large Version Controller
Applicable Model	Hitachi EX550-3
Category	Excavator ECU / Computer Board / Controller
Function	Engine control, hydraulic coordination, system communication
Build Structure	Large-format PCB with sealed electronic components
Durability	Heat-resistant, moisture-resistant, vibration-proof
Installation	OEM connector compatible, plug-and-play
Origin	China
Brand	YNF
MOQ	1 Piece
Shipping Options	Air, Sea, Express
Payment Terms	T/T, PayPal, Western Union

EX550-3 Controller Applications

Application Area	Description
ECU Engine Control	Manages power response and real-time engine adjustments
EX550-3 Hydraulic Synchronization	Controls hydraulic actuation and system logic
Excavator Electrical System Repair	Replaces faulty main computer boards
Heavy Machinery Aftermarket Distribution	Suitable for B2B parts dealers and wholesalers
Large Equipment Maintenance and Overhaul	Ensures stable operation in demanding excavation projects

EX550-3 Controller 9140451 Detail Display

FAQs

Related Products:

EX550-3 Monitor Display Panel
Hitachi Excavator Engine ECU Harness
Hydraulic Pump Solenoid Valve for Hitachi EX Series
EX550-3 Electrical System Components

FAQs：

Q: What is the difference between the 9140451 (large version) and 9140452 (small version)?
A: 9140451 is the large controller version with higher processing capacity, while 9140452 is the small version.
Q: Can this controller solve hydraulic delay issues?
A: Yes, ECU failure often causes hydraulic lag. Replacing with YNF16803 may restore synchronization.
Q: Is programming required after installation?
A: Generally plug-and-play, but system calibration may be recommended depending on machine condition.
Q: Is this controller suitable for harsh job sites?
A: Yes, it is built with high-temperature and vibration-resistant components.

Get Free Quote for EX550-3 Controller 9140451

The YNF16803 9140451 large-version controller provides dependable ECU performance for Hitachi EX550-3 excavators. Built with reinforced electronic components and stable signal-processing circuits, it significantly reduces machine downtime caused by control failures. YNF Machinery offers competitive wholesale pricing, strict quality control, and fast global delivery—making it ideal for distributors, construction fleet owners, and repair workshops. Contact us today for a detailed quotation and technical support.

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YNF16803 9140451 Controller EX550-3 Excavator ECU Computer Board (Large Version)

EX550-3 Controller Description

EX550-3 Controller Technical Sheet

EX550-3 Controller Applications

EX550-3 Controller 9140451 Detail Display

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