Understanding Torque Fade in Boom Lift Drive Wheels

[MikePhua]

Torque fade in boom lift drive wheels is a phenomenon where the wheels lose their ability to maintain consistent rotational force, especially under load. This issue can lead to reduced mobility and efficiency, posing challenges in various operational settings.
What Is Torque Fade?
Torque fade occurs when the hydraulic wheel motors, responsible for driving the wheels, exhibit diminished performance as the load increases. While the wheels may function adequately when the lift is unloaded, they struggle to maintain speed or even stop when a load is applied. This discrepancy often points to underlying issues within the drive system.
Potential Causes of Torque Fade
Several factors can contribute to torque fade in boom lifts:

1. Planetary Gearbox Malfunction: The planetary gearbox, integral to the wheel motor assembly, may experience issues such as worn-out gears or improper engagement, leading to inefficient power transfer.
   
2. Hydraulic System Failures: Leaks, air in the hydraulic lines, or failing hydraulic pumps can result in inadequate fluid pressure, affecting the performance of the wheel motors.
   
3. Brake Engagement: If the brake system inadvertently engages during operation, it can impede wheel movement, especially under load.
   
4. Motor Wear and Tear: Over time, wheel motors can wear out, leading to decreased efficiency and potential failure.
   

Diagnosing the Issue
To accurately diagnose the cause of torque fade:

• Visual Inspection: Examine the hydraulic lines for leaks, wear, or damage. Check for any signs of the brake system being engaged during operation.
  
• Hydraulic Pressure Tests: Measure the hydraulic pressure at various points in the system to ensure adequate fluid delivery to the wheel motors.
  
• Motor Performance Assessment: Test the wheel motors under different load conditions to identify any inconsistencies in performance.
  

Addressing the Problem
Depending on the identified cause:

• Repair or Replace the Planetary Gearbox: If the gearbox is faulty, it may need to be repaired or replaced to restore proper function.
  
• Service the Hydraulic System: Address any leaks, replace worn-out components, and ensure the hydraulic fluid is at the correct level and free from contaminants.
  
• Inspect and Adjust the Brake System: Ensure that the brake system is not engaging during operation unless intentionally activated.
  
• Replace Worn Motors: If the wheel motors are worn out, replacing them with new or refurbished units can resolve performance issues.
  

Preventive Measures
To minimize the risk of torque fade:

• Regular Maintenance: Implement a routine maintenance schedule to inspect and service the drive system components.
  
• Proper Training: Ensure operators are trained to recognize signs of torque fade and understand the importance of maintaining the equipment.
  
• Quality Components: Use high-quality, OEM-approved parts to ensure the longevity and reliability of the drive system.
  

Conclusion
Torque fade in boom lift drive wheels can significantly impact operational efficiency and safety. By understanding its causes, implementing effective diagnostic procedures, and taking preventive measures, operators can ensure their equipment remains reliable and performs optimally.