Troubleshooting Kubota KX71 with Mowing Attachments: Mobility Issues While Mowing

[MikePhua]

The Kubota KX71 is a compact, versatile mini excavator often used for various tasks such as digging, lifting, and even mowing with the appropriate attachments. Its compact size and maneuverability make it an excellent choice for operations in tight spaces, especially in landscaping, construction, and site development projects. However, when using attachments like mowers, a common issue reported by some operators is the inability to move while mowing, which can be quite frustrating and hinder productivity. This article will explore potential causes of this issue and provide solutions to resolve it.
Understanding the Kubota KX71 and Its Mowing Attachments
The Kubota KX71 is equipped with a range of capabilities, but when paired with mowing attachments, such as flail mowers or rotary cutters, it serves as a powerful tool for vegetation management. These attachments are often used for clearing grass, brush, and even small trees. However, unlike traditional mowers, which are powered solely by the tractor’s engine, attachments on the Kubota KX71 are powered hydraulically, meaning that the movement of the machine and the operation of the mower are interdependent on the hydraulic system's efficiency.
Common Issues that Prevent Movement While Mowing
Operators may experience difficulty moving the Kubota KX71 when using mowing attachments. Some common symptoms include:

1. Sluggish or No Movement
   • The mini excavator may not move at all or will exhibit sluggish movement while mowing. This can significantly reduce the efficiency of the operation, especially when the machine is required to move around frequently while cutting.
     
2. Loss of Hydraulic Power
   • The mower attachment is powered hydraulically, and a loss of hydraulic power can directly affect both movement and mowing performance. If the hydraulic system is not functioning properly, the movement and lifting functions may be limited.
     
3. Hydraulic System Overload
   • In some cases, the hydraulic system may be overloaded due to the increased demand of powering both the mower attachment and the machine’s movement simultaneously. If the system cannot handle the load, movement may be restricted.
     
4. Inadequate Hydraulic Flow
   • The hydraulic system may not be providing enough flow to operate both the attachment and the drive motors at the same time, which results in the machine being unable to move while mowing.
     

Potential Causes and Solutions
Here are several common causes and solutions for the Kubota KX71's mobility issues while using mowing attachments:
1. Insufficient Hydraulic Pressure
Cause:
If the hydraulic system is not providing enough pressure, it could impact both the movement and the mower's functionality. This could be due to low hydraulic fluid levels, a clogged filter, or a failing hydraulic pump.
Solution:

• Check Fluid Levels: Ensure that the hydraulic fluid is at the correct level. Low fluid can cause a lack of pressure in the system, reducing the performance of both the mower and the machine’s mobility.
  
• Replace the Hydraulic Filter: A clogged filter can restrict fluid flow, reducing system pressure. Regularly check and replace the filter as part of the machine’s maintenance schedule.
  
• Inspect the Hydraulic Pump: The hydraulic pump should be inspected for signs of wear or failure. If it is not providing sufficient pressure, it may need to be repaired or replaced.
  

2. Hydraulic System Blockage or Leaks
Cause:
Leaks in the hydraulic system or blockages in the lines can severely reduce the available pressure, preventing the machine from moving properly while operating the mower.
Solution:

• Inspect for Leaks: Check all hydraulic hoses and connections for signs of leaks or damage. A leak can result in a loss of hydraulic fluid and decreased pressure.
  
• Flush the System: If a blockage is suspected, flush the hydraulic system to remove debris that could be clogging the lines. This ensures smooth fluid circulation and efficient operation of both the mower and movement functions.
  

3. Overloaded Hydraulic System
Cause:
Mowing attachments like flail mowers or rotary cutters can place a high demand on the hydraulic system, especially if the machine is moving while operating the mower. If the system cannot provide enough power, the machine’s mobility can be compromised.
Solution:

• Balance the Load: Operators should avoid running both the mower and the machine at full capacity simultaneously, especially in challenging terrain. Reduce the load by working in short bursts or moving the machine and using the mower in separate phases.
  
• Upgrade the Hydraulic System: If the system is consistently overloaded, consider upgrading the hydraulic system components, such as increasing the pump capacity or improving the hydraulic lines to support the load.
  

4. Inadequate Flow Control for the Attachment
Cause:
If the hydraulic flow to the attachment is too high or too low, it can affect both the mower's operation and the loader's movement. Many Kubota KX71 owners report issues with the system not supplying the correct flow rate for simultaneous operation of both functions.
Solution:

• Adjust Flow Settings: The Kubota KX71 has adjustable flow settings that control how much hydraulic fluid is directed to the attachment. Ensure that the flow rate is properly adjusted for the specific attachment being used. You can refer to the user manual for guidance on flow rates.
  
• Check Flow Dividers: Some Kubota machines feature flow dividers to manage how the hydraulic fluid is distributed. Inspect these components to make sure that they are functioning correctly and are not causing an imbalance in hydraulic flow.
  

5. Insufficient Engine Power
Cause:
Sometimes, the issue lies in the engine, which may not be generating enough power to run both the hydraulic system and the drivetrain simultaneously. This can be especially true if the engine is aging or experiencing issues like clogged air filters, faulty fuel injectors, or worn-out components.
Solution:

• Check the Engine Performance: Regularly maintain the engine by changing the air filters, fuel filters, and checking the overall performance. A healthy engine is crucial for providing sufficient power to the hydraulic system and movement functions.
  
• Conduct Regular Engine Maintenance: Ensure that the engine is operating at peak efficiency by following the maintenance schedule outlined in the operator’s manual.
  

Conclusion
The Kubota KX71 is an excellent piece of equipment, capable of handling a wide range of tasks, including mowing with the proper attachments. However, when the machine experiences mobility issues while mowing, it’s often due to hydraulic system malfunctions, pressure drops, or an imbalance in the power requirements for both the drive and attachment. By understanding the components of the hydraulic system, performing regular maintenance, and troubleshooting common problems, operators can keep the Kubota KX71 performing at its best, ensuring efficient operation whether it’s mowing, digging, or moving.