Komatsu 1250-7 Main Pump Sensor Wiring Harness
Main Pump Sensor Wiring Harness for Komatsu 1250-7 excavator. OEM part 21N-06-33541. Direct replacement.
Fitment
Fits the Komatsu 1250-7 Excavator. ECS lists 5 harness sections for this machine — see all 5 sections for the Komatsu 1250-7 before you order, because the sections are not interchangeable.
Part number reference for the 21N-06-33541
This harness is one part sold under one number. Suppliers and parts books write it differently — you may see it as 21N-06-33541, 21N0633541. 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 Komatsu 1250-7
It runs in the pump compartment between the pump controls and the machine harness.
What it connects
- Pump displacement controls to the ECM — the commands that set pump output.
- Pump sensors to the ECM — pressure and speed feedback.
What a failing Komatsu 1250-7 harness looks like
| What the operator reports | Why the harness fits that symptom |
|---|---|
| Power derate with no hydraulic leak | A control circuit the ECM has lost. |
| Pump will not destroke | A command or feedback circuit. |
| Codes only at operating temperature | A run that opens when hot. |
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.
Other harness sections for the Komatsu 1250-7
Same type of harness on other machines
Product Description
Main Pump Sensor Wiring Harness for Komatsu 1250-7 excavator. OEM part number 21N-06-33541. 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 | 21N-06-33541 |
|---|---|
| Compatible Model | Komatsu 1250-7 Excavator |
| Harness Type | Main Pump Sensor |
| 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