Excavator Control Pattern Change on Hitachi EC150: Expert Guide to ISO vs. SAE Layout Swap

[MikePhua]

Why Control Patterns Matter
Excavators often allow switching between ISO (John Deere style) and SAE or Cat/backhoe layout. This preference impacts control of boom, stick (arm), and swing functions. Matching operator habit improves safety and productivity.
How Pattern Changing Works on the EC150
Many EC150 excavators (and Hitachi EX150s) lack a factory-installed pattern changer switch. In these cases, swapping the pilot hydraulic lines at the main control valve or pilot manifold is required .
Mechanics advise:

• Trace pilot hoses from the boom cylinder and stick (arm) cylinder to the pilot manifold.
  
• Label each line: boom up, boom down, stick in, stick out.
  
• Switch connections:
  • Boom Up ↔ Stick In
    
  • Boom Down ↔ Stick Out
    This reassigns spool functions and changes control feel to the alternate pattern .
    

On machines with a pattern selector lever (behind the cab or under the seat), the internal function swapping is done via hydraulic ports, and manual hose changes are unnecessary .
Step-by-Step Swap Process

• Locate and trace the pilot hoses near the control valve block.
  
• Tag each hose clearly (up, down, in, out).
  
• Disconnect and cross-link Boom Up with Arm In, Boom Down with Arm Out.
  
• Reconnect and test movements slowly after adjustments.
  
• If reverse directions occur (e.g. stick moves opposite), the swap may be mirrored or reversed per model specifics .
  

Operators’ Insights and Tips

• Label hoses carefully—many units have unmarked lines and may lack dedicated pattern changers.
  
• Some users locate a pilot manifold behind the seat; others must trace lines manually.
  
• Testing each function separately while machine is safely supported allows precise verification before operating under load.
  

Mini‑Glossary: Key Terms

• Pilot Lines: Control hoses carrying low-pressure hydraulic signals for spool valve actuation.
  
• ISO Controls: John Deere/excavator layout—right joystick controls stick & bucket, left joystick handles boom & swing.
  
• SAE/Cat Controls: Inverse layout—right joystick controls boom & swing, left controls stick & bucket.
  
• Pattern Changer: A mechanical lever or hydraulic switch allowing quick pilot pattern swap.
  

Case Example
One Hitachi EX150 operator lacked a visible pattern changer. After tagging and swapping the lines as described, he achieved full pattern swap. Initial misdirection of stick travel was corrected by reversing the hose pairs. Testing confirmed control matched desired ISO layout, restoring operator comfort.
Safety and Best Practices

• Ensure unit is powered off and depressurized before handling hydraulic hoses.
  
• Use proper tags or colored tape to avoid confusion during reassembly.
  
• Test circuits with minimal engine pressure or in diagnostic mode before heavy work.
  
• Follow pinned diagrams or schematics from service manuals to verify matches.
  

Summary
Swapping control patterns on an EC150 involves manually reassigning pilot control lines for boom and stick functions—specifically swapping boom up with stick in, and boom down with stick out. While some models offer selectable levers, many require hands-on hose swapping. Diligent tagging, testing, and caution ensure safe and successful control pattern changes, enabling operators to work in familiar layouts and reducing confusion.