Setting the Right Auxiliary Flow Pressure on the Takeuchi TB240 for Hydraulic Breakers

[MikePhua]

The Takeuchi TB240 is a compact and versatile mini excavator, designed for heavy-duty construction and demolition work. A key feature that enhances its productivity is the ability to use various hydraulic attachments, such as a hydraulic breaker. However, to ensure that these attachments perform efficiently and last longer, it’s crucial to set the auxiliary hydraulic flow pressure correctly. This article delves into the process of setting the right auxiliary flow pressure on the Takeuchi TB240 when using a hydraulic breaker, as well as the potential issues that could arise from incorrect pressure settings.
Understanding Auxiliary Hydraulic Flow Pressure
Before diving into the specifics of setting the right flow pressure for your hydraulic breaker, it’s important to understand the function of auxiliary hydraulic flow pressure. Hydraulic flow pressure controls how much fluid is delivered to hydraulic attachments, which in turn determines the speed and power of the attachment’s operation.
Key Concepts:

• Flow Pressure: The force exerted by the hydraulic fluid as it moves through the system to power attachments.
  
• Auxiliary Flow: This refers to the hydraulic power supplied to auxiliary equipment like breakers, augers, and rippers.
  
• System Pressure: This is the overall pressure within the excavator’s hydraulic system, which is adjustable based on the needs of the attachment.
  

For the Takeuchi TB240, the hydraulic breaker needs a specific amount of flow pressure to function properly. Too little flow can cause it to underperform, while too much pressure can lead to damage to the breaker, the excavator, or both.
Symptoms of Incorrect Auxiliary Flow Pressure
Setting the wrong auxiliary flow pressure can result in a range of issues, all of which can negatively impact productivity and cause unnecessary wear on both the machine and the attachment. Here are the most common symptoms to look out for:
1. Low Hydraulic Power
If the hydraulic breaker isn’t performing as expected, or if it seems to lack power when breaking concrete or rock, the cause could be insufficient hydraulic flow. This is often the result of incorrect flow pressure settings, where the system is not providing enough fluid to the breaker.

• Possible Causes:
  • Insufficient auxiliary hydraulic flow.
    
  • Low system pressure in the excavator.
    

Solution: Check the hydraulic pressure settings on the TB240 to ensure that the flow rate meets the requirements of the breaker. Consult the manufacturer’s manual for the correct flow rate for your specific breaker model.
2. Excessive Wear and Tear on the Breaker
When the flow pressure is set too high, it can cause the breaker to operate at a higher pressure than it is designed to handle. This can lead to excessive wear and tear, decreased efficiency, and potentially shorten the lifespan of the breaker.

• Possible Causes:
  • Over-pressurized hydraulic flow.
    
  • Incorrect or uncalibrated flow settings.
    

Solution: If the breaker is experiencing accelerated wear, reduce the hydraulic flow pressure according to the manufacturer’s specifications. Regularly inspect the breaker for signs of damage such as cracks, excessive heat, or oil leakage.
3. Poor Attachment Control or Functionality
An incorrectly adjusted hydraulic flow can also affect the control of the attachment. You may experience jerky movements, inconsistent performance, or erratic behavior of the breaker. This can make tasks like demolition or trenching less efficient and more difficult to manage.

• Possible Causes:
  • Flow rate mismatch with the hydraulic breaker’s specifications.
    
  • Dirty or clogged hydraulic filters, reducing flow consistency.
    

Solution: Ensure that the flow settings on the TB240 match the recommended pressure for the breaker. Clean or replace hydraulic filters if necessary to ensure smooth fluid flow.
4. Hydraulic Fluid Leaks
Improper hydraulic pressure can lead to excess stress on seals, fittings, and hoses, which may cause hydraulic fluid leaks. This not only reduces the efficiency of the machine but also creates potential safety hazards.

• Possible Causes:
  • Over-pressurized hydraulic system.
    
  • Worn-out or damaged seals and hoses due to excessive pressure.
    

Solution: Regularly check for hydraulic leaks and address any damage to hoses or seals. Lower the system pressure if leaks are found around the hydraulic breaker or related components.
Steps to Set the Correct Auxiliary Flow Pressure on the TB240
Setting the correct auxiliary flow pressure on the Takeuchi TB240 involves a series of steps, each of which ensures the hydraulic breaker functions optimally. While the process can vary slightly depending on the model of hydraulic breaker, the following general procedure can be applied:
Step 1: Refer to the Manufacturer’s Specifications
The first step in setting the auxiliary flow pressure is to check the specifications provided by both Takeuchi for the TB240 and the manufacturer of the hydraulic breaker. These specifications will outline the required flow rate (in gallons per minute or liters per minute) and pressure (in PSI or bar) that is ideal for the breaker’s performance.

• Example: A typical hydraulic breaker might require 30-40 liters per minute (8-10 gallons per minute) of flow at a pressure of 150-200 bar (2200-2900 PSI).
  

Step 2: Adjust the Auxiliary Flow Pressure
Once the necessary information is gathered, proceed to the excavator’s control panel to adjust the auxiliary hydraulic flow settings. On the TB240, the hydraulic flow can typically be adjusted through the machine’s control settings, which allow you to set both flow rate and pressure.

• Procedure:
  • Locate the hydraulic flow control on the control panel.
    
  • Adjust the flow rate to match the recommended setting.
    
  • Check the system pressure to ensure it is within the specified range for the hydraulic breaker.
    
  • Start the engine and activate the auxiliary circuit to ensure the breaker operates smoothly.
    

Step 3: Test the Hydraulic Breaker
After adjusting the flow, test the breaker by operating it under typical working conditions. This ensures that the breaker is operating at full capacity without excessive pressure or flow. Monitor the machine closely during the test to listen for any unusual sounds or signs of malfunction.

• Check:
  • The breaker should deliver consistent power without stuttering or struggling.
    
  • There should be no unusual noises, such as excessive vibrations or rattling.
    
  • The hydraulic system should not be overheating, and the breaker should be responsive to operator commands.
    

Step 4: Make Fine Adjustments
If the hydraulic breaker is still underperforming or showing signs of stress, make fine adjustments to the flow rate or pressure. It may take a few iterations to dial in the perfect settings, so be patient and take careful note of any performance changes.

• Tip: When adjusting, always make small changes to avoid over-pressurizing the system. Gradually increasing or decreasing the flow can help achieve the best results without risking damage to the attachment.
  

Step 5: Regular Maintenance
To maintain optimal performance, always perform regular maintenance on both the hydraulic system and the breaker. This includes changing hydraulic fluid, replacing filters, and inspecting hoses and seals for wear.

• Maintenance Checklist:
  • Clean or replace hydraulic filters every 500 hours of operation.
    
  • Inspect hydraulic lines and connectors for leaks or damage.
    
  • Regularly check the hydraulic fluid level and quality.
    

Conclusion
Setting the correct auxiliary flow pressure is essential to ensuring that your Takeuchi TB240 works efficiently with a hydraulic breaker. By following the manufacturer’s specifications, making small adjustments, and conducting regular maintenance, you can avoid costly damage and downtime. Taking the time to adjust and fine-tune the system for your specific attachment will maximize both performance and the lifespan of the hydraulic components, ensuring your equipment continues to perform at its best.