Changing Control Patterns on Komatsu PC200 and PC300 Excavators

[MikePhua]

Komatsu’s Excavator Lineage and Global Reach
Komatsu, founded in Japan in 1921, has become one of the world’s largest manufacturers of construction and mining equipment. Its hydraulic excavators, particularly the PC200 and PC300 series, are widely used across Asia, Europe, and North America. The PC200LC-8 and PC300LC-8 models represent mid- to large-sized machines designed for general earthmoving, trenching, and heavy-duty excavation. With operating weights ranging from 20 to 34 metric tons and engine outputs between 150 and 250 horsepower, these machines are known for their durability, fuel efficiency, and operator comfort.
Understanding Control Pattern Configurations
Excavators typically operate with one of two joystick control patterns:

• ISO Pattern: Left joystick controls boom up/down and swing; right joystick controls stick in/out and bucket curl.
  
• SAE Pattern (also called JD or North American): Left joystick controls swing and stick; right joystick controls boom and bucket.
  

Operators trained on one pattern often find it difficult to switch to another, which is why many modern excavators offer a pattern change valve or selector system.
Pattern Change Availability on PC200LC-8 and PC300LC-8
Not all Komatsu excavators come with a factory-installed pattern change valve. Some units—especially those sold in North America—include a selector valve located near the pilot control manifold. Others require manual hose reconfiguration to switch patterns.
In the PC300LC-8, a toggle switch and fuse located behind a small access door near the radiator and fuel separator may be mistaken for a pattern selector. However, this switch is actually used for draining water from the fuel separator, not for changing control patterns.
Manual Hose Switching Method
For machines without a built-in selector valve, the control pattern can be changed by re-routing pilot hoses before the shuttle valve. This involves:

• Identifying the pilot lines for boom, stick, swing, and bucket
  
• Disconnecting and swapping the appropriate hoses
  
• Ensuring all connections are tight and leak-free
  
• Testing the controls in a safe area before resuming work
  

This method requires mechanical knowledge and should only be performed by trained technicians. Incorrect hose routing can lead to erratic movement or hydraulic damage.
Field Experience and Operator Adaptation
In Australia, a contractor operating a PC200LC-8 trained on SAE pattern found himself on a jobsite with an ISO-configured machine. With no selector valve present, he manually switched the pilot hoses using labeled diagrams and restored familiar control within 30 minutes. This adaptability allowed him to maintain productivity without waiting for a technician.
In France, a fleet manager standardized all machines to ISO pattern and trained operators accordingly, reducing confusion and improving safety across multiple job sites.
Recommendations for Owners and Fleet Managers

• Check for selector valve presence before purchase or rental
  
• Label control patterns clearly in the cab for operator awareness
  
• Train operators on both patterns to improve flexibility
  
• Keep pilot hose diagrams on hand for manual switching
  
• Inspect toggle switches and fuses near the fuel separator regularly, but do not confuse them with pattern selectors
  

Conclusion
Control pattern configuration is a critical aspect of excavator operation, especially for Komatsu PC200 and PC300 series machines. While some units offer easy switching, others require manual intervention. Understanding the difference between pattern selectors and unrelated switches—like the fuel separator drain toggle—can prevent confusion and downtime. With proper training and documentation, operators can adapt quickly and maintain safe, efficient operation across diverse job sites.