Komatsu 600-815-7550 – Stop Solenoid Assembly

Overview: Critical Engine Fuel Shut-Off Component

The Komatsu Stop Solenoid Assembly (Part No. 600-815-7550) — often referenced as a Stop Fuel Solenoid or Solenoid Ass’y — is a vital engine component used to control fuel delivery to Komatsu diesel engines and heavy machinery applications. When activated or de-energized by the engine control electrical system, this solenoid assembly interrupts fuel flow, enabling secure and controlled engine shutdown. 

Designed for 24 V industrial power systems, this solenoid is engineered to deliver rapid and reliable actuation even in harsh operating conditions, including vibration, temperature changes, and dusty construction environments. It interfaces directly with engine fuel systems and control harnesses to provide a dependable shutdown function that protects the engine and supports worker safety.

Function & Operation

A stop solenoid functions as an electromechanical valve positioned within the fuel system. When the engine’s electrical control unit cuts power to the solenoid, the plunger mechanism instantly closes or restricts fuel flow, causing the engine to stop. This mechanism is essential for:

• Emergency engine shutdown

• Operator-initiated stop commands

• System fault/over-pressure response

• Preventing damage from fuel overrun

The Komatsu 600-815-7550 solenoid assembly is built to maintain consistent performance under heavy use and is often replaced as part of regular maintenance or engine diagnostic procedures. 

Design & Construction

This stop solenoid assembly typically features:

• 24 V DC electromechanical coil, optimized for industrial diesel engine control circuits. 

• Three-terminal electrical connector for secure power and signal interfacing. 

• Robust metal housing designed to resist environmental exposure and vibration. 

• Compact, serviceable design allowing easy replacement without extensive engine disassembly. 

Aftermarket brands (e.g., KMP Brand, YearnParts, Jeenda) are made to honor OEM compatibility and performance expectations, supplying quality alternatives worldwide. 

Applications & Compatibility

The 600-815-7550 Stop Solenoid Assembly is compatible with a wide range of Komatsu machines and engine variants, including but not limited to:

• Excavators: PC75UU-3, PC78US-5

• Wheel Loaders: PC60-7E, PC78UU-6

• Engine Models: Komatsu 4D102E, S6D102E, SA6D125E

• Other heavy machines: bulldozers and loaders requiring fuel shut-off control

These applications benefit from the solenoid’s ability to support safe shutdown, prevent fuel run-on, and minimize engine damage during emergency or controlled stops. 

Installation & Integration

Installing the solenoid assembly involves:

1. Accessing the engine fuel control module or solenoid mount

2. Disconnecting the electrical connector and wiring harness

3. Removing the old assembly and installing the replacement with proper torque

4. Reconnecting wiring terminals and testing shutdown functionality

Correct installation ensures the part reacts instantly to control signals and performs fuel interruption as designed, supporting both safety and compliance with Komatsu engine specifications.

FAQ

What is the Komatsu 600-815-7550 Stop Solenoid Assembly used for?

It interrupts fuel flow on Komatsu diesel engines to safely shut down the engine when controlled by the electrical system. 

What voltage does it operate at?

This solenoid assembly operates on 24 V DC, typical for heavy equipment engine control systems. 

Can it be used on multiple Komatsu machine models?

Yes — it fits excavators like PC75UU-3, PC78US-5, wheel loaders like PC60-7E, PC78UU-6, and engines such as 4D102E, S6D102E, SA6D125E. 

Is this an OEM part?

600-815-7550 is the designated Komatsu OEM part number, and aftermarket equivalents are supplied by reputable parts brands. 

Why is the stop solenoid important?

It ensures controlled engine shutdown and prevents fuel run-on or damage during emergency stops. 

Call to Action

Request a quote for the Komatsu Stop Solenoid Assembly – 600-815-7550 to ensure reliable fuel shut-off and safe engine control in your heavy equipment. Contact Seven Star LLC for pricing, availability, and support.