Troubleshooting Terex R070T Bucket and Boom Issues

[MikePhua]

The Terex R070T is a versatile and powerful compact track loader often used in construction, landscaping, and material handling. One of the most essential features of any loader is its hydraulic system, responsible for controlling the boom, bucket, and other attachments. A common issue faced by operators of the Terex R070T involves the bucket getting stuck in a full curl position, while the boom lift continues to push upwards when it should be moving downwards. This situation can be frustrating and lead to significant downtime if not addressed promptly.
This article dives deep into the possible causes of this issue, how it can be diagnosed, and potential solutions to restore proper functionality.
Understanding the Terex R070T Hydraulic System
The Terex R070T, like many compact loaders, relies on a hydraulic system that powers its lifting arms and bucket. The system works by using hydraulic fluid to create force and movement in the actuators, allowing the loader to lift, curl, and tilt its bucket as needed. The hydraulic pump provides fluid flow to the system, and the control valves direct that flow to specific cylinders, ensuring the machine performs its intended tasks.
A loader’s hydraulic system includes the following key components:

• Hydraulic Pump: Provides the flow of hydraulic fluid.
  
• Hydraulic Cylinders: Responsible for controlling the movement of the boom and bucket.
  
• Control Valves: Direct the flow of hydraulic fluid to the appropriate cylinder to perform specific tasks.
  
• Hydraulic Fluid: Transfers force through the system and lubricates moving parts.
  

When the bucket is stuck in a full curl position and the boom is pushing upward instead of moving down, it's often a sign of an issue within this system.
Possible Causes of the Problem

1. Hydraulic Fluid Contamination
   One of the most common issues leading to improper hydraulic function is fluid contamination. Contaminants like dirt, debris, and moisture can enter the hydraulic system, causing the control valves to malfunction. Contaminated fluid can also lead to blockages or reduced fluid flow, preventing the system from operating efficiently.
   Solution: Perform a thorough inspection of the hydraulic fluid and ensure it is clean and at the proper level. If contamination is found, drain the system and replace the fluid with fresh, clean hydraulic oil. It may also be necessary to replace filters to ensure the system operates smoothly.
   
2. Faulty Hydraulic Valves
   The control valves in the Terex R070T play a critical role in directing fluid to the appropriate hydraulic cylinder. If a valve becomes stuck or malfunctions, it can cause erratic behavior, such as the bucket being stuck in the full curl position or the boom continuing to push upward when it should be descending.
   Solution: Inspect the control valves for any signs of damage or wear. In some cases, the valve may be clogged or damaged, which could prevent proper fluid flow. Cleaning or replacing the control valve should fix the problem.
   
3. Leaking Hydraulic Cylinders
   Hydraulic cylinders are responsible for moving the loader’s boom and bucket. If there is a leak in one of these cylinders, it can result in a loss of pressure, which may prevent the cylinder from fully retracting or extending. This could cause the bucket to remain stuck in the full curl position while the boom moves incorrectly.
   Solution: Check the hydraulic cylinders for any visible signs of leaks or damage. If the cylinders are damaged or leaking, they may need to be repaired or replaced. Ensure that seals are intact, and that the cylinders are operating smoothly.
   
4. Pressure Relief Valve Issues
   The pressure relief valve is designed to protect the hydraulic system from excessive pressure. If this valve is malfunctioning or improperly adjusted, it can cause erratic movements in the hydraulic system, leading to the bucket getting stuck in the full curl position or the boom acting unpredictably.
   Solution: Inspect the pressure relief valve and ensure it is set to the correct pressure. If the valve is faulty, it may need to be replaced or calibrated to ensure it is functioning correctly.
   
5. Hydraulic Pump Failure
   A failing hydraulic pump can lead to inconsistent hydraulic fluid pressure, which can manifest as irregular movement in the loader’s boom or bucket. If the pump is not providing consistent pressure, it may cause the bucket to become stuck in a position, while the boom continues to move incorrectly.
   Solution: Check the hydraulic pump for wear or damage. If the pump is not generating the correct pressure, it may need to be repaired or replaced. This is a more advanced issue that may require the assistance of a technician to resolve.
   
6. Electrical or Sensor Malfunctions
   Modern loaders, including the Terex R070T, may have sensors and electrical components that monitor and control hydraulic functions. A malfunctioning sensor could cause improper hydraulic responses, such as the boom pushing upward when it should be moving down or the bucket being stuck in the full curl position.
   Solution: Perform a diagnostic check on the loader’s electrical system. Look for faulty wiring, damaged sensors, or error codes that could indicate the root cause of the issue. If a sensor or electrical component is found to be defective, it may need to be replaced.
   

Steps for Troubleshooting

1. Check Fluid Levels and Condition:
   Begin by checking the hydraulic fluid level and condition. Low or dirty fluid can lead to poor hydraulic performance. Replace fluid if it appears contaminated or low.
   
2. Inspect the Hydraulic Cylinders:
   Look for signs of leaks or damage in the boom and bucket cylinders. Any visible signs of wear or oil leakage should be addressed immediately.
   
3. Examine the Hydraulic Valves:
   Inspect the control valves for clogs or malfunctions. If any part of the valve system is stuck or damaged, it may need to be cleaned or replaced.
   
4. Test the Pressure Relief Valve:
   If the issue persists after checking fluid and components, test the pressure relief valve. Make sure it is operating at the correct pressure and free from debris or damage.
   
5. Check the Hydraulic Pump:
   If all other components seem to be in working order, inspect the hydraulic pump for issues. A failing pump could cause the hydraulic system to operate erratically.
   
6. Perform Electrical Diagnostics:
   If none of the mechanical components are to blame, use a diagnostic tool to check the loader’s electrical system. Look for issues with sensors or wiring that could be causing the problem.
   

Conclusion
A Terex R070T with a bucket stuck in full curl and an improperly functioning boom lift is a serious issue that needs prompt attention to prevent further damage. By carefully diagnosing the hydraulic system, checking the fluid, valves, cylinders, and electrical components, operators can pinpoint the cause and take appropriate action. Regular maintenance, such as fluid checks, cylinder inspections, and filter changes, can help prevent these types of problems from occurring and keep the machine running smoothly. For more complex issues, seeking professional assistance is recommended to ensure proper repairs and to keep the loader in optimal working condition.