Komatsu WA600-3 Wiring Harness — All 4 Sections
The Komatsu WA600-3 uses 4 separate harness sections that ECS builds. They are not interchangeable: the part number on your old loom decides which one you need. Below they are grouped by where each section sits on the machine, with the part numbers and the symptoms that point to each group.
Which section do I actually need?
Start from the fault, not from the part name. Find the symptom the operator reports, then open that group.
| Section | First symptom to look for | Group |
|---|---|---|
| Fuse Box Harness | The same fuse blows repeatedly | Fuse Box Harness group |
| Sensor Harness | Several sensor codes at the same time | Sensor Harness group |
| Cab Harness | One group of dash functions dead | Cab Harness group |
| ECU / Controller Harness | Controller dead or rebooting | ECU / Controller Harness group |
Fuse Box Harness 1 part
It sits in or immediately behind the fuse and relay box, where battery power is split into the individual circuits.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 421-06-22461 | Fuse Box Wiring Harness (No.2) | $104.00 | In stock |
Sensor Harness 1 part
It is the branch that carries pressure, temperature and speed signals from sensors back to the ECM. It usually runs low along the frame or the engine, wherever the sensors are.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 6240-81-5810 | Engine Sensor Wiring Harness | $1043.00 | In stock |
Cab Harness 1 part
It enters the cab through the floor or the rear wall and runs behind the trim to the switch panel, the operator seat and the HVAC unit.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 426-06-22530 | Cab Wiring Harness | $5067.00 | In stock |
ECU / Controller Harness 1 part
It sits between the controller box and the machine harness, in the cab or behind a panel, and carries the low-level inputs and outputs the controller reads.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 6240-81-5820 | Engine ECU Wiring Harness | $1043.00 | In stock |
Not sure which of the 4 sections is yours?
Send a photo of the tag on your old harness to WhatsApp +86-13714733803 and we will confirm the part number against this list before you order. Getting the section wrong is the most common reason a replacement does not fit.