Product Description

Product Name: Main Wiring Harness / Frame Wiring Harness
Part Number: 21QB-14405
OEM Number: 21QB-14405
Machine Model: Hyundai R520-9S Excavator
Category: Electrical System Parts
Application: Main Electrical System & Frame Circuit Connection
Condition: OEM New / High-Quality Replacement

The 21QB-14405 Main Wiring Harness is specially designed for Hyundai R520-9S crawler excavators. It functions as the central electrical connection network, linking the engine ECU, hydraulic control system, monitor, sensors, relays, solenoid valves, and various electrical components throughout the machine. The OEM reference identifies 21QB-14405 as a Hyundai Frame Harness used on R520LC-9S and related 9-Series excavators.

Manufactured with premium copper conductors, OEM-standard connectors, and heavy-duty protective sheathing, this harness ensures reliable power transmission and stable signal communication in demanding mining, quarrying, and heavy construction applications.

Key Features

✔ OEM Standard Quality

• Manufactured according to Hyundai specifications
• Direct replacement for original harness
• Accurate connector and terminal configuration
• Plug-and-play installation

✔ High Conductivity Copper Wire

• Pure copper multi-strand conductors
• Stable current transmission
• Reduced voltage drop
• Improved electrical reliability

✔ Waterproof Connectors

• Sealed OEM-style connectors
• Excellent resistance to moisture and dust
• Suitable for harsh working environments

✔ Heavy-Duty Protection

• Wear-resistant braided sleeve
• Oil-resistant insulation
• High-temperature resistant outer covering
• Long service life under heavy-duty operation

✔ Stable System Communication

Supports communication between:

• Engine ECU
• Hydraulic Controller
• Monitor Display
• Sensors
• Solenoid Valves
• Relay Modules
• Main Electrical Components

Suitable Models

Hyundai Excavators

• R520LC-9S
• R520-9S

The OEM reference for 21QB-14405 lists compatibility with Hyundai 9-Series crawler excavators including R520LC-9S.

Technical Specifications

Common Failure Symptoms

When the main wiring harness becomes damaged, the machine may experience:

• Engine starting failure
• ECU communication errors
• Hydraulic system alarms
• Sensor signal loss
• Monitor display malfunction
• Intermittent electrical faults
• Power transmission instability

Replacing a damaged harness can restore machine performance and reduce costly downtime.

Quality Inspection

Every harness is tested before shipment:

• Circuit Continuity Test
• Connector Verification
• Terminal Inspection
• Pin Assignment Check
• Appearance Inspection
• Packaging Protection Test

Important Notice

To ensure correct compatibility, please provide:

• Machine model
• Machine serial number
• Old harness photos
• Harness label photos
• OEM part number

Our technical team will verify the harness before shipment.

Why Choose JISION?

• Professional Excavator Electrical Parts Supplier
• Complete Hyundai Excavator Parts Range
• OEM & High-Quality Aftermarket Solutions
• Strict Quality Control
• Fast Worldwide Shipping
• Technical Support Available

JISION Product Range

• Complete Wiring Harnesses
• Engine Wiring Harnesses
• Cabin Wiring Harnesses
• ECU / ECM Controllers
• Monitor Displays
• Solenoid Valves
• Sensors
• Diagnostic Tools

JISION – Your Reliable One-Stop Supplier for Excavator Electrical Parts and Control Systems.