Komatsu HD785-7 Dump Truck Wiring Harness — All 7 Sections
The Komatsu HD785-7 uses 7 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 |
|---|---|---|
| Engine Harness | Intermittent misfire or a dead cylinder | Engine Harness group |
| Injector Harness | One cylinder cold or dead | Injector Harness group |
| Transmission Harness | Limp mode or a single gear only | Transmission Harness group |
Engine Harness 4 parts
It runs inside the engine compartment, clipped along the block and head and routed past the front cover. On most machines it is the longest harness on the engine side and the one closest to exhaust heat.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 6219-81-8410 | Engine Wiring Harness | $1353.00 | In stock |
| 6219-81-8411 | Engine Wiring Harness (Left) | $1192.00 | In stock |
| 6219-81-8421 | Engine Wiring Harness | $1417.90 | In stock |
| 6219-81-8422 | Engine Wiring Harness (Right) | $1192.00 | In stock |
Injector Harness 2 parts
It sits under the valve cover on most engines, passing through the gasket or the head into the injector bores. It is the hottest electrical component on the machine.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 6219-81-8810 | Fuel Injector Wiring Harness | $339.90 | In stock |
| 6219-81-8820 | Fuel Injector Wiring Harness | $339.90 | In stock |
Transmission Harness 1 part
It runs from the transmission control valve and speed sensors up to the ECM or the transmission controller.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 561-15-75822 | Transmission Wiring Harness | $1043.00 | In stock |
Not sure which of the 7 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.