Komatsu PC120-3 Crawler Excavator

[MikePhua]

Introduction
The Komatsu PC120-3, introduced in 1988, is a mid-sized hydraulic crawler excavator that gained recognition for its robust performance and reliability in various construction and excavation tasks. As part of Komatsu's 120 series, the PC120-3 was designed to offer a balance between power and maneuverability, making it suitable for urban construction sites and smaller projects.
Development and Technological Advancements
The PC120-3 was developed during a period when the construction industry was seeking machines that could deliver high performance in confined spaces. Komatsu responded by equipping the PC120-3 with advanced hydraulic systems and a compact design. The excavator featured a closed-center load sensing system, which allowed for precise control of hydraulic functions and improved fuel efficiency. This system ensured that hydraulic power was delivered only when needed, reducing energy consumption and enhancing operational efficiency.
Engine and Performance Specifications
The PC120-3 was powered by a Komatsu S4D95L-1 engine, a 4-cylinder, turbocharged diesel engine known for its durability and fuel efficiency. This engine produced approximately 90 horsepower, providing the necessary power for various excavation tasks. The excavator's hydraulic system offered a pump flow rate of 85.4 gallons per minute, supporting multiple functions simultaneously without compromising performance.
Dimensions and Weight
The PC120-3's compact dimensions made it ideal for working in confined spaces:

• Operating Weight: Approximately 25,570 lbs (11,600 kg)
  
• Length: 25 ft 1 in (7.65 m)
  
• Width: 8 ft 1 in (2.47 m)
  
• Height: 8 ft 10 in (2.68 m)
  
• Track Width: 20 in (510 mm)
  
• Ground Clearance: Approximately 1.32 ft (0.4 m)
  

These dimensions allowed the PC120-3 to navigate narrow job sites with ease, making it a versatile machine for urban construction projects.
Hydraulic System and Attachments
The PC120-3's hydraulic system was designed for versatility, supporting a range of attachments to suit various tasks:

• Standard Bucket: Approximately 0.45 m³ capacity
  
• Long Reach Arm: Extended reach for digging in hard-to-access areas
  
• Hydraulic Thumb: Added for material handling and lifting tasks
  

The closed-center load sensing hydraulic system ensured that the excavator could operate multiple functions simultaneously without loss of power, enhancing productivity on the job site.
Operator Comfort and Safety
Komatsu prioritized operator comfort and safety in the design of the PC120-3. The excavator featured a spacious cab with excellent visibility, reducing operator fatigue during long shifts. The cab was equipped with air conditioning and ergonomic controls, allowing operators to work efficiently in various environmental conditions. Safety features included a ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure) certified cab, providing protection in the event of an accident.
Maintenance and Durability
The PC120-3 was designed with durability and ease of maintenance in mind. Routine maintenance tasks, such as checking fluid levels and replacing filters, were made accessible, reducing downtime and maintenance costs. The excavator's components, including the undercarriage and hydraulic system, were built to withstand the rigors of demanding work environments, ensuring a long service life.
Legacy and Market Impact
The Komatsu PC120-3 made a significant impact in the construction industry, particularly in markets where space constraints were a concern. Its combination of power, compact size, and versatility made it a popular choice for contractors working in urban areas. The PC120-3's success contributed to Komatsu's reputation as a leading manufacturer of reliable and efficient construction equipment.
Conclusion
The Komatsu PC120-3 crawler excavator remains a notable model in the history of construction machinery. Its innovative design, powerful performance, and adaptability to various tasks have left a lasting legacy in the industry. For those seeking a reliable and efficient machine for mid-sized excavation projects, the PC120-3 continues to be a valuable asset.