Troubleshooting Auxiliary Control Button Issues on the JCB 8065

[MikePhua]

The JCB 8065, a versatile compact tracked loader, is a workhorse on many job sites, thanks to its ability to handle a variety of attachments through its auxiliary hydraulic system. However, one common issue that operators encounter is the failure of the auxiliary control button. This button is crucial for controlling various attachments, and when it stops working, it can disrupt operations and lead to inefficiencies on the job site. Understanding why this happens and knowing how to troubleshoot the problem is essential for keeping the machine running smoothly.
This article will cover the potential causes of a malfunctioning auxiliary control button on the JCB 8065, troubleshooting steps to identify the issue, and tips to prevent similar problems in the future.
Understanding the Auxiliary Control Button Function
The auxiliary control button on the JCB 8065 controls the hydraulic flow to attachments like augers, grapples, and breakers. It’s an essential feature that provides the operator with the flexibility to control auxiliary functions easily. Typically located on the joystick or console, this button activates or deactivates the hydraulic circuit for auxiliary attachments, making it an integral part of the loader's operation.
When the auxiliary control button fails to respond, it prevents the operator from activating the required attachments, leading to a loss of productivity and potential downtime.
Common Causes of Auxiliary Control Button Failure
There are several reasons why the auxiliary control button on the JCB 8065 might stop working. Understanding these common causes can help you pinpoint the issue quickly.
1. Electrical Issues
The auxiliary control button is an electronic switch that communicates with the hydraulic system via relays and sensors. Electrical issues, such as blown fuses, loose wiring, or faulty relays, can interrupt the signal from the button to the hydraulic control system.
Signs of Electrical Problems:

• Button not responding when pressed
  
• No activation of the auxiliary function
  
• Intermittent operation of the button or attachment
  

How to Fix It:

• Inspect the wiring connected to the auxiliary control button and look for any signs of wear, corrosion, or loose connections.
  
• Check the fuse related to the auxiliary control system and replace it if necessary.
  
• Test the relays with a multimeter to ensure they are functioning properly. Replace any faulty relays to restore normal function.
  

2. Hydraulic System Malfunctions
The auxiliary control system is closely tied to the hydraulic system. If there is an issue with the hydraulic pressure or flow, it can prevent the auxiliary attachment from functioning correctly. Problems such as clogged filters, low hydraulic fluid levels, or air in the hydraulic lines can disrupt the auxiliary function.
Signs of Hydraulic Issues:

• Slow or no response from the attachment
  
• Jerky or erratic movement when using the auxiliary attachment
  
• Unusual noise from the hydraulic system when activating the button
  

How to Fix It:

• Check the hydraulic fluid level and top it up if necessary. Low fluid levels can cause pressure problems.
  
• Inspect the hydraulic filters and replace them if they are clogged or dirty.
  
• Bleed the hydraulic lines to remove any trapped air that could be causing inconsistent hydraulic flow.
  
• Test the pressure relief valve to ensure it is set correctly and is not causing pressure issues.
  

3. Faulty Button or Switch
In some cases, the issue may be as simple as a defective auxiliary control button itself. Buttons and switches can wear out over time due to frequent use, moisture exposure, or electrical surges. If the button becomes unresponsive or faulty, it can prevent the attachment from activating.
Signs of a Faulty Button:

• Button feels loose or doesn’t click when pressed
  
• Button does not trigger the hydraulic function, even when the rest of the system appears to be working
  
• Physical damage or visible wear on the button itself
  

How to Fix It:

• Inspect the button for physical damage or wear. If the button is visibly damaged or no longer clicks, it likely needs to be replaced.
  
• If the button appears to be functioning mechanically but is still not working, check the electrical connections and wiring behind the button.
  
• Replace the faulty switch with a new one, ensuring that it matches the specifications for the JCB 8065.
  

4. Software or Control System Malfunctions
Modern equipment like the JCB 8065 often uses advanced control systems to manage its various functions. If there is an issue with the software or control module, it may prevent the auxiliary control button from sending the correct signals to the hydraulic system. These problems could be caused by software glitches, updates, or malfunctioning control units.
Signs of Control System Issues:

• Complete lack of response from the auxiliary function
  
• Error codes or warning lights on the dashboard
  
• Irregular operation of other functions that rely on the control system
  

How to Fix It:

• Check for any error codes on the machine's control system and consult the operator’s manual for troubleshooting steps.
  
• If the issue seems related to the control module, it may need to be recalibrated or reprogrammed.
  
• If software-related problems persist, consider contacting an authorized dealer for a system reset or update.
  

How to Diagnose and Troubleshoot the Problem
When troubleshooting a non-working auxiliary control button, a systematic approach will help identify the root cause. Here’s how you can diagnose the problem:
Step 1: Inspect the Button and Wiring
Start by inspecting the physical button and the wiring connected to it. Look for signs of wear, corrosion, or loose connections. If the button is faulty, replace it with a new one.
Step 2: Check the Fuses and Relays
Next, inspect the fuses and relays associated with the auxiliary control system. If any fuses are blown, replace them, and test the relays for functionality. A faulty relay can prevent the button from sending the correct signal to the hydraulic system.
Step 3: Test the Hydraulic System
Check the hydraulic fluid level and inspect the hydraulic system for any signs of leaks or blockages. Ensure that the hydraulic system is pressurized correctly and that the flow of fluid is uninterrupted. If you suspect air in the lines, bleed the system to restore normal function.
Step 4: Diagnose the Control System
If the button and hydraulic system seem to be functioning properly, the issue may lie with the control system. Look for any error codes or warning lights that could indicate a software or control module issue. If necessary, reset the control system or consult with a professional technician.
Preventive Maintenance Tips for Auxiliary Control Systems
To prevent future issues with the auxiliary control button, consider the following preventive maintenance practices:

• Regularly inspect the button and wiring: Ensure that the button and associated wiring are free from damage and corrosion.
  
• Maintain the hydraulic system: Regularly check the hydraulic fluid levels and replace the filters as part of your routine maintenance.
  
• Test the system frequently: Periodically test the auxiliary control button and its associated functions to ensure that everything is operating as expected.
  
• Update software as needed: Keep the equipment’s software and control systems updated to avoid glitches or malfunctions.
  

Conclusion
A malfunctioning auxiliary control button on the JCB 8065 can hinder your operations, but by following a structured troubleshooting approach, you can quickly identify the problem and resolve it. Whether the issue is related to the button itself, the electrical system, or the hydraulic components, prompt diagnosis and repair will minimize downtime and keep your machine running efficiently.
Regular maintenance and careful attention to the auxiliary control system are crucial for preventing future problems. By staying on top of inspections and addressing issues early, you can ensure that your JCB 8065 operates smoothly and reliably for years to come.