John Deere 570A Blade Control Issue Troubleshooting and Solutions

[MikePhua]

The John Deere 570A motor grader is a heavy-duty piece of machinery used for various construction and grading tasks. One of the critical components for efficient operation is the blade control system, which is responsible for the tilt, elevation, and positioning of the blade. When issues arise with blade control, the machine may become difficult to operate, affecting overall productivity. Common problems with blade control typically involve the hydraulic system, control valve, electrical components, or wear and tear on the mechanical parts. This article will explore the common causes of blade control failure and the steps to troubleshoot and resolve these issues.
Common Causes of Blade Control Problems

1. Hydraulic System Malfunction
   Blade tilt and elevation are primarily controlled by the hydraulic system. If the hydraulic oil is low, the system leaks, or the hydraulic pump fails, the blade may not operate properly.
   Solution:
   • Check the hydraulic oil level to ensure it’s within the recommended range.
     
   • Inspect the hydraulic lines and hoses for leaks, especially at connections and bends.
     
   • Test the hydraulic pump and cylinders for proper operation, and replace any faulty parts as necessary.
     
2. Control Valve Issues
   The control valve is responsible for regulating the flow of hydraulic fluid to the blade tilt and elevation system. If the valve is stuck, worn out, or leaking, it can prevent the blade from functioning properly.
   Solution:
   • Inspect the control valve for smooth operation, ensuring it is not stuck or leaking.
     
   • Clean the valve to remove any debris or blockages.
     
   • If the valve is damaged or malfunctioning, replace it.
     
3. Electrical System Problems
   Modern motor graders, including the John Deere 570A, use electrical components to control various functions, including the blade. Electrical failures, such as loose wires, corroded connections, or a malfunctioning control module, can disrupt the blade control system.
   Solution:
   • Inspect the electrical wiring, connectors, and terminals for any signs of corrosion or looseness.
     
   • Test the electrical control module to ensure it’s working correctly.
     
   • If there are issues with the electrical system, repair or replace faulty components.
     
4. Hydraulic Oil Contamination
   Contaminated hydraulic oil can lead to blockages in the system, affecting the fluid flow and causing the blade control to malfunction.
   Solution:
   • Check the hydraulic oil for contamination. If the oil is dirty or contaminated, drain and replace it.
     
   • Clean the entire hydraulic system to remove any debris or contaminants.
     
   • Regularly replace hydraulic filters to maintain clean oil.
     
5. Wear and Tear on Blade Components
   Long-term use of the blade can lead to wear on the hydraulic cylinders, pins, and other mechanical parts that control the blade’s position. Worn components can cause the blade to operate inefficiently or fail altogether.
   Solution:
   • Inspect the hydraulic cylinders, pins, and other moving parts for signs of wear or damage.
     
   • Replace any worn or damaged components, such as seals or pins, to restore proper blade operation.
     

Troubleshooting Steps

1. Check Hydraulic Oil Level
   Start by verifying the hydraulic oil level. Ensure the oil is at the correct level and is free from contaminants. If the oil level is low or the oil is dirty, top it up or replace it as necessary.
   
2. Inspect Hydraulic Lines and Pump
   Check all hydraulic lines and hoses for leaks. Also, inspect the hydraulic pump and cylinders for signs of malfunction. If leaks are detected, replace the damaged hoses. If the pump or cylinders are faulty, replace them.
   
3. Examine the Control Valve
   Ensure that the control valve is functioning correctly. If the valve is sticking, leaking, or not responding, clean or replace it.
   
4. Inspect Electrical Components
   Verify that all electrical connections are secure and free from corrosion. Check the control module for proper operation. If any electrical components are malfunctioning, repair or replace them as needed.
   
5. Check for Wear on Blade Components
   Inspect the blade’s hydraulic cylinders, pins, and other moving parts for wear. Replace any worn or damaged parts to ensure smooth operation.
   

Conclusion
Issues with the John Deere 570A blade control system are typically caused by problems within the hydraulic system, control valve, electrical components, or mechanical wear. By regularly inspecting the hydraulic system, electrical components, and mechanical parts, you can prevent many of these issues. If a blade control failure occurs, follow the troubleshooting steps outlined above to diagnose and resolve the problem, ensuring the machine returns to optimal operation and efficiency.