EC35 Driving Issues: Troubleshooting and Solutions

[MikePhua]

Introduction
The EC35 is a popular compact excavator, known for its reliability and versatility on job sites. However, like any piece of heavy equipment, it can experience driving issues that may affect its performance. This article addresses common driving issues experienced by EC35 owners and provides troubleshooting steps to resolve them.
Common EC35 Driving Issues

1. Loss of Power or Slow Movement
   

One of the most common complaints from EC35 operators is a lack of power or slow movement, particularly when trying to drive the machine in various directions. The machine may struggle to move forward, backward, or turn, which can significantly affect productivity.
Possible Causes:

• Low Hydraulic Fluid Levels: The EC35’s driving system relies heavily on hydraulic power. If the hydraulic fluid level is low, the machine may not have enough pressure to move efficiently. Regularly checking the fluid levels and ensuring that the hydraulic fluid is clean and at the proper level can resolve this issue.
  
• Clogged Hydraulic Filter: A clogged filter can restrict fluid flow, resulting in sluggish performance. Replacing or cleaning the hydraulic filter can often improve movement.
  
• Worn Drive Motors or Pumps: If the drive motors or hydraulic pumps are worn or damaged, they may not deliver sufficient power to the wheels or tracks. This would require repair or replacement.
  

1. Inability to Drive in Certain Directions
   

Another common issue is the inability of the EC35 to drive in certain directions, such as forward or backward. This issue can be particularly frustrating when trying to navigate tight spaces or maneuver on a job site.
Possible Causes:

• Faulty Directional Control Valve: The directional control valve directs hydraulic flow to the appropriate motor, enabling movement in specific directions. If this valve is malfunctioning, it may prevent the machine from moving in one or more directions. Replacing or repairing the control valve can restore proper functionality.
  
• Hydraulic System Blockage: A blockage or restriction in the hydraulic lines can cause issues with fluid flow, preventing the machine from moving in certain directions. Inspecting the system for blockages and clearing any restrictions can resolve this problem.
  
• Electrical or Sensor Issues: Many modern excavators, including the EC35, rely on electronic sensors and systems to control movement. A malfunctioning sensor or wiring issue can disrupt the movement controls. Diagnosing and repairing electrical faults is crucial to resolving this problem.
  

1. Jerky or Erratic Movement
   

Operators may notice jerky or erratic movement while driving the EC35, particularly when attempting to change directions or accelerate. This issue can make operation uncomfortable and unsafe, and can be indicative of underlying hydraulic or mechanical problems.
Possible Causes:

• Air in the Hydraulic System: Air trapped in the hydraulic system can cause irregular flow and result in jerky or erratic movement. Bleeding the system to remove air can help resolve this issue.
  
• Worn Hydraulic Components: Worn seals, hoses, or valves within the hydraulic system can affect performance. Replacing these worn components can help restore smooth operation.
  
• Improper Control Calibration: In some cases, the control system may need to be recalibrated to ensure smoother movement. Checking the system’s calibration and adjusting it may fix the erratic movement.
  

1. Loss of Steering Control
   

Some EC35 owners have reported a loss of steering control, making it difficult to navigate the machine. This problem can occur in various situations, such as when turning or trying to change direction quickly.
Possible Causes:

• Faulty Steering Pump: The steering system relies on a hydraulic pump to provide the necessary pressure to turn the wheels or tracks. A faulty pump can result in a loss of steering control. Replacing the steering pump may resolve this issue.
  
• Leaking Hydraulic Lines or Fittings: Leaks in the hydraulic lines or fittings can cause a loss of pressure, affecting the steering ability. Checking the lines for leaks and replacing any damaged components can restore steering function.
  
• Contaminated Hydraulic Fluid: Dirty or contaminated hydraulic fluid can reduce the efficiency of the steering system. Flushing and replacing the fluid with fresh, clean hydraulic oil can improve steering control.
  

Troubleshooting and Solutions
If you are experiencing driving issues with your EC35, here are the steps to troubleshoot and resolve the problem:

1. Check Fluid Levels: Ensure the hydraulic fluid is at the correct level and is clean. Low or dirty fluid can significantly affect the machine's performance.
   
2. Inspect for Leaks: Look for any signs of hydraulic fluid leaks around the pump, valves, hoses, and fittings. Repairing or replacing any damaged components can restore proper fluid pressure and improve movement.
   
3. Examine Hydraulic Filters and Pumps: Check the hydraulic filter for blockages or contamination. Replacing a clogged filter can resolve sluggish movement. Also, inspect the hydraulic pump for wear or damage, as this can lead to loss of power.
   
4. Check the Directional Control Valve: If the machine is not moving in certain directions, inspect the directional control valve for malfunctions. Repair or replace the valve if needed.
   
5. Bleed the Hydraulic System: If air has entered the hydraulic system, it may cause erratic movement. Bleed the system to remove any air bubbles and restore smooth performance.
   
6. Inspect Steering Components: If the steering is unresponsive, check the steering pump and hydraulic lines for damage. Replace any faulty parts to restore steering function.
   

Conclusion
Driving issues with the EC35 can disrupt operations and reduce productivity on job sites. By following the troubleshooting steps outlined above, operators can address common problems such as loss of power, steering issues, jerky movement, and directional control problems. Regular maintenance and timely repairs are essential to keep the EC35 running smoothly and efficiently for years to come.