| Parameter | Value / Specification |
|---|---|
| OEM Part Number | 6755-81-9310 |
| Product Type | Engine Wiring Harness (Complete Assembly) |
| Engine Platform | Komatsu SA6D107E-2 (6-Cylinder Diesel) |
| Equipment Models | Komatsu PC210-10, PC240-10 Excavators |
| Conductor Material | High-Strand Count Copper (Automotive Grade) |
| Insulation Material | Cross-Linked Polyethylene (XLPE) / Heat-Resistant PVC |
| Temperature Range | -40°F to 257°F (-40°C to 125°C) |
| Voltage Rating | 12V / 24V DC (Heavy Equipment Electrical System) |
| Connector Type | OEM-Spec Molded Connectors (TE / Sumitomo / Yazaki compatible) |
| Protection | Abrasion-Resistant Loom / Taped Harness Bundles |
| Weather Resistance | IP67 Rated (Water and Dust Resistant Connectors) |
| Design Standard | Manufactured to meet or exceed Komatsu OEM electrical specifications |
| NO | Number | Name | Qty |
| 1 | 6755-81-9310 | WIRING HARNESS | 1 |
| 2 | 08041-00500 | • FUSE, 5A | 1 |
| 3 | 08041-01000 | • FUSE, 10A | 13 |
| 4 | 08041-02000 | • FUSE, 20A | 5 |
| 5 | 08041-03000 | • FUSE, 30A | 1 |
| 6 | 04434-53411 | CLIP | 3 |
| 7 | 195-33-11220 | SPACER | 3 |
| 8 | 01010-81040 | BOLT | 3 |
| 9 | 01643-31032 | WASHER | 3 |
| 10 | 04434-51710 | CLIP | 2 |
| 11 | 195-33-11220 | SPACER | 2 |
| 12 | 01010-81040 | BOLT | 2 |
| 13 | 01643-31032 | WASHER | 2 |
| 14 | 01010-81016 | BOLT | 1 |
| 15 | 01643-31032 | WASHER | 1 |
| 16 | 04434-53411 | CLIP | 1 |
| 17 | 01010-81020 | BOLT | 1 |
| 18 | 01643-31032 | WASHER | 1 |
| 19 | 08034-20519 | BAND | 3 |
| 20 | 04434-52310 | CLIP | 3 |
| 21 | 195-33-11220 | SPACER | 3 |
| 22 | 01010-81040 | BOLT | 3 |
| 23 | 01643-31032 | WASHER | 3 |
| 24 | 08193-30010 | CLIP | 1 |
| 25 | 08028-43030 | CABLE | 1 |
| 26 | 01010-81020 | BOLT | 1 |
| 27 | 01643-31032 | WASHER | 1 |
| 28 | 04434-51910 | CLIP | 1 |
| 29 | 01010-81020 | BOLT | 1 |
| 30 | 01643-31032 | WASHER | 1 |
| OEM Part Number | Compatible Equipment | Engine | System |
|---|---|---|---|
| 6755-81-9310 | Komatsu PC210-10 | SA6D107E-2 | Engine Control & Sensor Harness |
| 6755-81-9310 | Komatsu PC210LC-10 | SA6D107E-2 | Complete Engine Wiring Assembly |
| 6755-81-9310 | Komatsu PC240-10 | SA6D107E-2 | ECU to Engine Components |
| 6755-81-9310 | Komatsu PC240LC-10 | SA6D107E-2 | Fuel Injection & Monitoring System |
| Note: | This harness is a direct replacement for the specified OEM part number. Always verify your equipment serial number and original harness part number before installation. |
| Component | Specification | Function |
|---|---|---|
| Main Harness Loom | Taped Bundle with Protective Sleeving | Organizes and protects wiring routing through engine compartment |
| ECU Connector | OEM-Spec Multi-Pin (Molded, Sealed) | Connects all engine sensors to the Engine Control Unit |
| Common Rail Injector Harness | High-Capacity Shielded Circuit | Supplies power and signal to fuel injectors |
| Sensor Connectors | OEM-Specific Sealed Connectors | Crankshaft, Camshaft, Coolant Temp, Oil Pressure, Intake Air Temp, Boost Pressure |
| Alternator Wiring | High-Gauge, Heat-Resistant Cable | Connects alternator charging circuit to battery and ECU |
| Starter Wiring | Heavy-Duty Battery Cable | Supplies power to starter motor |
| Ground Straps | Braided Copper / Tinned Terminals | Ensures proper electrical grounding for engine and sensors |
| Glow Plug Harness | High-Temperature Resistant Circuit | Powers cold start glow plugs |
| Fuel Water Separator Harness | Sealed Connector Assembly | Connects fuel water separator sensor to warning system |
| Exhaust Aftertreatment Harness | Heat-Shielded Wiring | Connects DPF and SCR sensors (where equipped) |
Complete engine wiring harness assembly with all connectors and terminals pre-installed
ECU (Engine Control Unit) main connector (sealed, pre-assembled)
Full set of sensor connectors (crankshaft, camshaft, coolant temperature, oil pressure, intake air temperature, boost pressure, fuel temperature)
Common rail fuel injector wiring sub-harness (6-cylinder configuration)
Alternator and starter wiring (as per OEM configuration)
Glow plug harness (as equipped)
Exhaust aftertreatment system harness (DPF/SCR sensors)
Engine ground cables and terminals
Protective conduit, loom, and retaining clip sections
Note: This is a complete engine harness assembly. All wires are terminated with OEM-spec sealed connectors and color-coded to match original equipment. A wiring diagram is not included; refer to the Komatsu service manual for pin-out details and diagnostic procedures.
Designed for: Komatsu SA6D107E-2 diesel engine in PC210-10 and PC240-10 excavators
Works In Conjunction With: Engine Control Unit (ECU), common rail fuel system, engine sensors, exhaust aftertreatment system
Quality Features: Each harness undergoes continuity testing, connector fitment verification, and insulation resistance testing
Excluded Items: ECU, sensors, actuators, fuse/relay box, battery, and battery cables are not included unless specified
| Step | Procedure |
|---|---|
| 1. Safety First | Disconnect both battery terminals (negative first). Wait at least 30 seconds after engine stop before servicing electrical components |
| 2. Part Verification | Compare the new harness with the original to confirm identical connector types, wire colors, routing lengths, and clip locations |
| 3. Documentation | Take detailed photos of the original harness routing, connector locations, and retaining clip positions before removal. Refer to Komatsu service manual for specific routing diagrams |
| 4. Remove Old Harness | Carefully disconnect all sensors, injectors, and ECU connectors. Remove retaining clips and cable ties. Extract the old harness without pulling on wires |
| 5. Inspect Mating Components | Check all mating connectors (ECU, sensors, actuators) for corrosion, bent pins, or damage. Clean or replace as necessary |
| 6. Route New Harness | Install the new harness following the exact routing path of the original. Use all factory mounting clips, brackets, and cable ties to secure the harness away from moving parts, exhaust manifold, turbocharger, and sharp edges |
| 7. Connect All Components | Connect all sensors, injectors, actuators, and the ECU securely. Ensure each connector clicks or locks into place. Verify proper orientation of keyed connectors |
| 8. Secure Ground Connections | Ensure all ground straps are cleaned and securely fastened to designated engine and chassis ground points |
| 9. Final Visual Inspection | Double-check all connections. Verify harness does not contact hot surfaces, moving parts, or sharp edges. Ensure adequate slack for engine vibration |
| 10. Reconnect Battery | Reconnect battery terminals (positive first). Perform a system power-up check |
| 11. Diagnostic Verification | Start the engine and verify no warning lights. Use Komatsu diagnostic scanner to confirm all sensors are communicating and no open or short circuit codes are present |
| Warning Category | Precaution / Instruction |
|---|---|
| OEM Matching Required | This harness is specifically designed for Komatsu PC210-10 and PC240-10 excavators with the SA6D107E-2 engine. Verify your equipment serial number and original harness part number before purchase |
| ECU Compatibility | Ensure the ECU software version is compatible with this harness configuration. Harness changes may require ECU reprogramming for certain machine serial number breaks |
| Routing is Critical | Improper routing can cause wires to chafe against sharp edges, melt on hot surfaces (exhaust manifold, turbo, EGR cooler), or be damaged by moving parts (fan, belts, linkage). Follow OEM routing diagrams precisely |
| Connector Sealing | All connectors are weather-sealed. Ensure seals are not damaged during installation. Loose or unsealed connectors will cause corrosion and intermittent electrical faults |
| Battery Disconnection | Always disconnect batteries before servicing the wiring harness to prevent short circuits, electrical damage, and potential airbag deployment (if equipped) |
| Injection System Safety | The common rail fuel injection system operates at very high pressures. Do not disconnect injector connectors with engine running. Ensure system is depressurized before servicing |
| Diagnostic Verification | After installation, perform a full diagnostic scan to verify all sensors are communicating and there are no open, short, or rational fault codes. Clear any stored codes |
| Exhaust Aftertreatment | If equipped with DPF/SCR, ensure all aftertreatment sensors are properly connected. Malfunctioning connections may trigger derate or forced regeneration issues |
| Anti-Theft Systems | Some machines may have anti-theft or security systems integrated with the ECU/harness. Verify security codes or programming requirements before disconnecting |
| Application Area | Equipment / Engine | Harness Function |
|---|---|---|
| Hydraulic Excavators | Komatsu PC210-10, PC210LC-10 | Complete Engine Management System |
| Hydraulic Excavators | Komatsu PC240-10, PC240LC-10 | ECU Communication, Injector Control |
| Engine Platform | Komatsu SA6D107E-2 (6-Cylinder Diesel) | Sensor Integration, Actuator Control |
| Fuel System | Common Rail (HPCR) | Injector Harness, Rail Pressure Sensor |
| Exhaust Aftertreatment | DPF / SCR (Where Equipped) | Temperature Sensors, NOx Sensors, Differential Pressure |
| Heavy Equipment | Construction & Mining Excavators | OEM-Spec Electrical Replacement |
| Diagnostic Interface | CAN Bus Communication | Connects ECU to machine monitoring system |
