## Komatsu 125-2 Series Diesel Engine: A Powerhouse for Industrial Applications

The Komatsu 125-2 Series diesel engine is a renowned powerhouse in the industrial equipment sector, renowned for its exceptional performance, reliability, and fuel efficiency. Engineered with cutting-edge technology and robust construction, this engine series is the driving force behind a wide range of heavy-duty applications, including:

- Construction machinery (excavators, bulldozers, cranes)
- Mining equipment (dump trucks, drills, loaders)
- Agricultural machinery (tractors, harvesters, combines)
- Generator sets for power generation
- Marine propulsion systems

### Technical Specifications:

The Komatsu 125-2 Series diesel engine is available in four main variants: the S6D125-2SA1, S6D125-2SB1, S6D125-2SC1, and S6D125-2SD1. These variants differ in certain specifications, such as power output and emission levels, to meet the specific requirements of different applications.

**Common Specifications:**

- Engine Type: 6-cylinder, 4-stroke, turbocharged, direct-injection diesel engine
- Displacement: 12.0 liters
- Bore: 135 mm
- Stroke: 155 mm
- Compression Ratio: 17:1

### Performance Characteristics:

The Komatsu 125-2 Series diesel engine delivers exceptional performance across all operating conditions:

- **Power Output:** The engine generates impressive power outputs ranging from 250 to 375 kW (335 to 500 horsepower) at speeds between 1900 and 2200 rpm.
- **Torque:** The engine produces high torque levels, ensuring excellent pulling power and acceleration.
- **Fuel Efficiency:** The advanced fuel injection system and optimized combustion process result in excellent fuel economy, reducing operating costs.
- **Emissions Compliance:** The engine meets stringent emission regulations, including EPA Tier 4 Final and EU Stage V, minimizing environmental impact.

### Design and Construction:

The Komatsu 125-2 Series diesel engine is meticulously designed and constructed to withstand demanding operating conditions:

- **Robust Engine Block:** The engine block is made of high-strength cast iron, providing rigidity and durability.
- **Cylinder Head:** The cylinder head features a direct-injection design, optimizing fuel combustion and increasing efficiency.
- **Cooling System:** An advanced cooling system with a large radiator and thermostatically controlled fan ensures optimal engine temperatures under all loads.
- **Fuel System:** The fuel system incorporates a high-pressure common rail injection system for precise fuel delivery and improved performance.
- **Electronic Control System:** The engine is equipped with an advanced electronic control system that monitors and adjusts engine parameters for optimal operation.

### Applications:

The Komatsu 125-2 Series diesel engine is widely used in a variety of industrial applications, including:

- **Construction Machinery:** The engine's power and torque make it an ideal choice for powering heavy-duty construction equipment such as excavators, bulldozers, and cranes.
- **Mining Equipment:** The engine's reliability and durability make it suitable for powering mining equipment such as dump trucks, drills, and loaders.
- **Agricultural Machinery:** The engine's fuel efficiency and performance make it a cost-effective option for powering agricultural machinery such as tractors, harvesters, and combines.
- **Generator Sets:** The engine's stable operation and high efficiency make it ideal for powering generator sets for reliable power generation.
- **Marine Propulsion Systems:** The engine's compact size and low emissions make it suitable for powering marine propulsion systems in commercial and recreational vessels.

### Conclusion:

The Komatsu 125-2 Series diesel engine represents the pinnacle of engineering excellence in the industrial equipment sector. Its robust construction, exceptional performance, fuel efficiency, and emissions compliance make it the preferred choice for powering a wide range of demanding applications. Whether it's powering heavy-duty construction machinery, mining equipment, agricultural machinery, generator sets, or marine propulsion systems, the Komatsu 125-2 Series diesel engine delivers unmatched reliability and productivity.

The Komatsu 125-2 Series Diese Engine service manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate understanding of the product and showing him the correct way to perform repairs and make judgments. Make sure you understand the contents of this manual and use it to full defect at every opportunity.
This Komatsu 125-2 Series Diese Engine service manual mainly contents the necessary technical information for operation performed in a service workshop.

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Komatsu 125-2 Series Diese Engine service manual
Komatsu 125-2 Series Diese Engine repair manual
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Komatsu 125-2 Series Diese Engine shop manual.

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This manual is devided into chapters.Here we provide you the manual index to help you have an idea about this Komatsu 125-2 Series Diese Engine manual:

-general
-structure and function
-testing and adjusting
-disassembly and assembly
-maintenance standard
-repair and replace of parts


This KOMATSU 125-2 SERIES DIESE ENGINE covers all aspects of repair:
- Simply print out the pages you need or print the entire manual as a whole!!!
- Detailed substeps expand on repair procedure information.
- Notes, cautions and warnings throughout each chapter pinpoint critical information.
- Numbered instructions guide you through every repair procedure step by step.
- Bold figure number help you quickly match illustrations with instructions.
- Detailed illustrations, drawings and photos guide you through every procedure.
- Enlarged inset helps you identify and examine parts in detail.
- Numbered table of contents easy to use so that you can find the information you need fast.

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KOMATSU 125-2 SERIES DIESE ENGINE
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