Troubleshooting a 2008 Volvo EC140CL Excavator: Slow Right Track & Bucket Curl Issues

[MikePhua]

Introduction: Understanding Excavator Performance Problems
Excavators are among the most versatile and powerful pieces of heavy machinery used in construction, mining, and demolition. With their ability to dig, lift, and move large volumes of material, excavators like the Volvo EC140CL are a staple on job sites worldwide. However, like any machine, they can experience mechanical issues that affect their performance.
One common problem that operators face is inconsistent or sluggish movement in the tracks or hydraulic components, like the bucket curl, which can impact the machine's ability to perform essential tasks. In this article, we’ll dive into the case of a 2008 Volvo EC140CL excavator experiencing a slow right track and bucket curl issues, and explore possible causes, troubleshooting methods, and solutions.
The Problem: Slow Right Track and Bucket Curl
The operator of a 2008 Volvo EC140CL excavator noticed a significant issue: the right track was slower than the left, and there was a noticeable lag in the bucket curl functionality. These symptoms can affect the overall efficiency of the machine, making it harder to perform tasks that require precision, such as grading, digging, and moving heavy materials.
The machine’s performance issues can be particularly troubling because they reduce the operator's ability to work efficiently, especially in fast-paced environments where time is critical.
Possible Causes of Slow Right Track and Bucket Curl Issues

1. Hydraulic System Problems
   

One of the most common causes of issues with the bucket curl and the right track is a hydraulic malfunction. Excavators like the Volvo EC140CL rely on hydraulic fluid to power their cylinders, which control the movement of the tracks, boom, arm, and bucket. If there is a low hydraulic fluid level, it can result in uneven power delivery to the hydraulic cylinders, causing one side of the machine to move slower than the other.
Additionally, a blocked or restricted hydraulic filter can reduce the flow of hydraulic fluid, affecting performance. Hydraulic issues could also stem from a leaking hydraulic hose or a faulty hydraulic pump, both of which can disrupt the even distribution of power to the components.

1. Track Drive Motor or Undercarriage Issues
   

The right track on the Volvo EC140CL could be experiencing a mechanical failure related to its track drive motor or the undercarriage components. Track drive motors are responsible for powering the tracks, and a malfunction in these motors can result in slow movement or uneven speeds between the tracks.
The undercarriage is also a critical part of the machine's performance. Worn-out track rollers, idlers, or sprockets can cause the tracks to function poorly, leading to inconsistent speeds between the left and right tracks.

1. Electrical or Sensor Problems
   

Modern excavators like the Volvo EC140CL are equipped with complex electronic systems that monitor and control various components, including the hydraulic system, track drive, and bucket. If the sensors or electrical wiring connected to these components are damaged or malfunctioning, it can cause improper readings or control issues.
For example, a faulty speed sensor or position sensor on the right track could cause the machine to struggle with maintaining consistent movement. Similarly, faulty electrical connections to the bucket curl mechanism could result in sluggish operation.
Troubleshooting Steps for the Volvo EC140CL
To resolve the slow right track and bucket curl issues on the 2008 Volvo EC140CL, follow these troubleshooting steps:

1. Check Hydraulic Fluid Levels
   

The first step in troubleshooting is to check the hydraulic fluid levels. Low hydraulic fluid can cause uneven operation and reduced performance in both the tracks and bucket. If the fluid level is low, top it up with the correct type of hydraulic fluid as recommended in the operator’s manual. Also, check for any signs of leakage around the hydraulic lines, cylinder seals, or fittings.

1. Inspect Hydraulic Filters and Hoses
   

Next, inspect the hydraulic filters to ensure they are not clogged with debris. A dirty filter can restrict the flow of hydraulic fluid and cause performance issues. If necessary, clean or replace the filter. Similarly, check all hydraulic hoses for leaks, wear, or cracks that could cause fluid loss and inefficiency.

1. Examine the Track Drive Motors and Undercarriage
   

Inspect the track drive motor on the right side for signs of wear, leaks, or damage. A slow or malfunctioning drive motor will result in slower track movement. Additionally, examine the undercarriage components, such as the rollers, sprockets, and track tension. Worn-out components may need to be replaced to restore normal track operation.

1. Diagnose Electrical and Sensor Issues
   

Use the machine’s diagnostic system to check for any error codes or issues with the electrical system. Look for any faults related to the bucket curl mechanism or the track speed sensors. If an error code indicates a sensor failure, it may need to be replaced. Inspect the wiring and connectors for any loose or damaged connections that could be causing electrical malfunctions.

1. Perform a Pressure Test on Hydraulic Components
   

If the problem persists after checking the hydraulic fluid and filters, perform a hydraulic pressure test to ensure the pump and valves are operating within the correct pressure range. Low pressure could indicate a problem with the hydraulic pump or control valves, which would need to be repaired or replaced.
Preventive Maintenance to Avoid Future Issues
Regular preventive maintenance can help avoid many of the issues that led to the slow right track and bucket curl problems on the Volvo EC140CL. Some key maintenance tasks include:

• Regularly checking and topping up hydraulic fluid levels.
  
• Replacing hydraulic filters every 500-1,000 hours, depending on the working conditions.
  
• Inspecting the undercarriage for wear and replacing track components as needed.
  
• Performing periodic checks of the electrical and sensor systems to ensure they are functioning properly.
  

Conclusion: Keeping the Volvo EC140CL Running Smoothly
The Volvo EC140CL excavator is a reliable and efficient machine, but like all heavy equipment, it requires regular maintenance and attention to keep it performing at its best. If you experience issues with the right track or bucket curl, it’s essential to troubleshoot the hydraulic system, track drive motor, undercarriage components, and electrical systems to identify the root cause.
By following the steps outlined in this article and performing regular maintenance, you can ensure that your Volvo EC140CL continues to operate efficiently, helping you complete your construction and excavation projects on time.