Caterpillar 315F Engine Wiring Harness
Engine Wiring Harness for Caterpillar 315F excavator. OEM part 455-6840. Direct replacement.
Fitment
Fits the Caterpillar 315F Excavator. This is the only section ECS currently lists for this machine, so confirm the part number on your old harness against 455-6840 before ordering.
Part number reference for the 455-6840
This harness is one part sold under one number. Suppliers and parts books write it differently — you may see it as 455-6840, 4556840 · CA4556840. They are all the same part; the number on the tag of your old harness is what settles the order.
If the tag shows a different number entirely, do not order by eye — send us a photo of it on WhatsApp and we will match it against the catalogue before anything ships.
Where this harness sits on the Caterpillar 315F
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.
What it connects
- ECM to the sensor set — coolant temperature, oil pressure, intake manifold pressure and temperature, and engine speed pickups — the inputs the ECM uses for fueling and derate decisions.
- ECM to the injector harness — the engine harness feeds the injector sub-harness rather than driving the injectors itself.
- ECM to the actuators — fuel control and air management devices that the ECM commands.
- Engine to the machine side — the link that carries power and ground into the engine circuits.
What a failing Caterpillar 315F harness looks like
| What the operator reports | Why the harness fits that symptom |
|---|---|
| Intermittent misfire or a dead cylinder | Often dismissed as an injector until the harness is swapped and the fault follows the loom. |
| Hard starting, or dies when hot | Resistance rises with temperature in a damaged run. Runs fine cold, fails once the engine is at operating temperature. |
| Sensor codes with good sensors | A single bad run can make two or three sensors read implausibly at once. |
| Derate or power loss under load | The ECM protects the engine when an input drops out mid-load. |
| Fault appears only on rough ground | A chafed run that touches ground intermittently, usually at a clip or a bend. |
These are circuit-level symptoms, not a diagnosis. The same behaviour can come from a sensor, an ECM input or a mechanical fault — the checks below are how you tell them apart.
How to confirm it is the harness before you buy
- Compare the part number on the old harness. The number is printed on a tag or moulded into the main connector body. If it does not match, stop — stop here and send us a photo, because two sections of the same machine are not interchangeable.
- Resistance test the suspect run. Disconnect both ends and measure end to end. A reading that is far above the others in the same loom means broken strands; a reading to ground means chafing.
- Wiggle test under load. Back-probe the circuit with the machine running and flex the loom by hand along its length, especially at clips and at the cab or boom entry. If the meter or the fault jumps, you have found the run.
Same type of harness on other machines
Product Description
Engine Wiring Harness for Caterpillar 315F excavator. OEM part number 455-6840. Direct replacement ensuring plug-and-play installation.
Why Choose ECS System Parts?
- Factory Direct: we build the loom — no middlemen
- In Stock Ready to Ship: most orders leave within 24 hours
- OEM Quality: made to the original drawing, connector for connector
- 1 Year Warranty: full coverage against defects
- Worldwide Shipping: DHL, FedEx, UPS, EMS
- Expert Support: WhatsApp +86-13714733803 — send us a photo of your old harness and we will confirm the section
Technical Specifications
| OEM Part Number | 455-6840 |
|---|---|
| Compatible Model | Caterpillar 315F Excavator |
| Harness Type | Engine |
| Warranty | Packaging Machine Normal Use |
Shipping Information
- DHL / FedEx / UPS / EMS worldwide
- Ships within 24 hours
- 3-7 days express, 7-15 days standard
- Tracking number provided
Return Policy
- 30-day return window
- Must be unused, original packaging
- Contact via WhatsApp for RMA authorization