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6156-81-9110 Fuel Injector Wiring Harness for Komatsu Excavator PC400-7 Engine SA6D125E-3
Keep your Komatsu PC400-7 PC400-8 working with the TOPARTS 6156-81-9110 Fuel Injector Wiring Harness. It replaces the original harness one-for-one and is built for the vibration, heat and dirt that come with daily work on site.
It is used with the SA6D125E-3 engine and is matched to that engine's sensor and connector layout.
What This Harness Does
On a modern diesel, each injector opens on a precisely timed electrical pulse from the ECM. The injector harness carries those pulses, so its condition directly decides whether fuel is delivered at the right moment and in the right amount to each cylinder.
The injector harness is short, but it carries some of the most critical signals on the engine. A weak connection on a single injector circuit can make one cylinder go dead, causing vibration, smoke and a noticeable loss of power.
Komatsu excavators are known for long service lives, and many keep working well past the point where their original wiring has aged. A new harness is often the key to keeping an older Komatsu reliable.
Fitting Advice
- Clean the area around the valve cover thoroughly before opening it, so no dirt reaches the injectors.
- Note the cylinder order of each injector lead before disconnecting.
- Inspect injector terminals and nuts; tighten to the specified torque.
- Replace the valve cover gasket and any pass-through seals while you are in there.
Why a New Harness Beats Patching
A single visible fault is often a sign of wider ageing. Heat cycling and vibration affect every wire in the bundle, not just the one that failed. Fitting a new harness means you are not chasing the next fault next month.
Common Questions
Is this harness plug-and-play?
Yes. It is built to the original layout with matching connectors, so it installs in place of the original without cutting or splicing.
Is this a genuine or aftermarket part?
Please see the Condition line in the specifications above. Every part is checked for fit and continuity before shipping.
What should I do if the part does not match?
Contact us with photos of the original and the new part. We will help you resolve the issue quickly.
When to Replace It
Typical signs include:
- Black or white smoke from the exhaust
- Injector circuit fault codes on the monitor
- One or more cylinders misfiring
- Rough idle and increased engine vibration
- Oil-soaked, brittle or cracked harness insulation under the valve cover
When diagnostics point to a circuit fault rather than a failed component, replacing the wiring is often the most cost-effective repair.
What You Get with TOPARTS
Each harness is produced under strict quality control, with wire gauges, colours and connector types matched to the original specification. Terminals are crimped for secure contact, and the bundle is protected with sleeving where the original used it.
Part Information
- Part Name: Fuel Injector Wiring Harness
- Part Number: 6156-81-9110, 6156819110
- Engine: SA6D125E-3
- Condition: Aftermarket new
- Product Weight: 1 kg / 2.20 lbs
- Brand: TOPARTS
- Warranty: 6 months
- Feature: Original connector layout; plug-and-play installation
Applicable Models
Komatsu Excavator PC400-7 PC400-8 PC-450-8 Komatsu Engine SA6D125E-3
Order & Delivery
- Payment Method: PayPal, Stripe, Credit card, Visa, etc.
- Shipping Method: DHL, FedEx, UPS, TNT, USPS EMS, etc.
- Track Your Order: An email containing the tracking number with a link will be sent to you as soon as it ships.
Note: Please verify your part number and match our product pictures to your original item before ordering. If you have any questions, please feel free to contact us. Thanks.
