John Deere 319D Auxiliary Hydraulics Not Working: Common Causes and Solutions

[MikePhua]

The John Deere 319D is a popular skid steer loader known for its versatility and powerful hydraulic system. One of the key features of this machine is its auxiliary hydraulic system, which allows the operator to power attachments such as hydraulic breakers, grapples, and augers. However, like any complex hydraulic system, the auxiliary hydraulics can sometimes fail to operate correctly. In this article, we’ll explore common causes for auxiliary hydraulic failure on the John Deere 319D and provide troubleshooting tips to help you get back to work.
Understanding the Auxiliary Hydraulics on the John Deere 319D
The John Deere 319D is equipped with a high-performance hydraulic system that provides the necessary power to operate various attachments. The auxiliary hydraulics are powered by a separate set of hydraulic circuits that supply flow and pressure to the attachment's hydraulic motors or cylinders. These auxiliary circuits are controlled by the operator through switches and levers within the cabin, which engage the hydraulic flow.
There are two types of auxiliary hydraulics commonly used on the 319D: Standard Flow and High Flow. The standard flow system provides enough hydraulic power for typical attachments such as augers and sweepers, while the high flow system is designed for more demanding attachments like hydraulic breakers and mulching heads. Depending on the attachment being used, the flow rate of the hydraulic system must match the requirements of the tool.
Common Causes of Auxiliary Hydraulic Failure
When the auxiliary hydraulics on the 319D fail to operate, there could be several reasons behind the issue. Below are some of the most common causes:
1. Hydraulic Fluid Issues
Hydraulic fluid is the lifeblood of the entire hydraulic system. Without it, the system cannot function. Low fluid levels or contaminated fluid can lead to poor hydraulic performance and even system failure. Some issues that can arise from hydraulic fluid problems include:

• Low Fluid Levels: Insufficient hydraulic fluid can cause the system to lose pressure, preventing the auxiliary hydraulics from functioning. This is one of the most common issues and can be easily fixed by topping up the fluid.
  
• Contaminated Fluid: Dirty or contaminated hydraulic fluid can clog filters and reduce the system's ability to flow fluid. Contaminants such as dirt or water can cause premature wear of hydraulic components, leading to malfunctions.
  
• Incorrect Fluid Type: Using the wrong type of hydraulic fluid can cause improper lubrication and cooling, leading to overheating and performance issues.
  

2. Faulty Hydraulic Pump
The hydraulic pump is responsible for pressurizing the hydraulic fluid and supplying it to the various components of the system, including the auxiliary hydraulics. If the pump is malfunctioning, the hydraulic fluid may not be pressurized correctly, resulting in no power being sent to the auxiliary circuit.
Common symptoms of a faulty hydraulic pump include:

• Weak or inconsistent hydraulic flow.
  
• A noticeable drop in auxiliary hydraulic power.
  
• An increase in engine noise while operating.
  

3. Blocked or Clogged Hydraulic Lines
Another common issue in hydraulic systems is a blockage or clog in the hydraulic lines. If debris or contaminants block the lines leading to the auxiliary circuit, the flow of hydraulic fluid will be restricted. This can cause the auxiliary hydraulics to stop working or operate at reduced capacity.
Regular maintenance of the hydraulic lines, including checking for leaks or blockages, can help prevent this issue. If a blockage is suspected, the lines should be inspected and cleaned or replaced as necessary.
4. Faulty Solenoid or Valve
The solenoid valve controls the flow of hydraulic fluid to the auxiliary circuit. If the solenoid or valve malfunctions, the auxiliary hydraulics may not receive the correct flow of fluid, leading to a failure in operation. The solenoid can fail due to electrical issues, wear, or corrosion.

• Electrical Malfunction: A blown fuse or loose wiring could prevent the solenoid from engaging. This can cause the auxiliary hydraulics to fail or work intermittently.
  
• Valve Failure: The valve controlling the auxiliary hydraulics may become stuck, corroded, or worn out, preventing proper hydraulic flow. If the valve is faulty, it may need to be replaced.
  

5. Hydraulic Pressure Settings
If the hydraulic pressure setting is incorrect, it can prevent the auxiliary hydraulics from delivering enough power to the attachment. The 319D is equipped with pressure adjustment settings for both standard and high-flow hydraulics. If these settings are off, attachments may not function correctly.
Troubleshooting Tips for Auxiliary Hydraulics Not Working
If you’re experiencing issues with your John Deere 319D auxiliary hydraulics, follow these troubleshooting steps to identify and resolve the problem.
Step 1: Check Hydraulic Fluid

• Inspect Fluid Levels: Start by checking the hydraulic fluid level. If the fluid is low, top it up with the recommended type of fluid. Ensure that the fluid is clean and free of contaminants.
  
• Inspect Fluid Condition: Look at the color and clarity of the hydraulic fluid. If the fluid is dark, milky, or has a burnt odor, it may be contaminated and need to be replaced.
  

Step 2: Inspect Hydraulic Lines and Filters

• Check for Leaks: Look for any visible leaks in the hydraulic lines, hoses, or fittings. A leak can reduce hydraulic pressure and cause the system to fail.
  
• Inspect Filters: Ensure that the hydraulic filters are clean and functioning properly. Clogged filters can restrict fluid flow and lead to hydraulic failure.
  

Step 3: Test the Hydraulic Pump

• Listen for Unusual Sounds: While operating the machine, listen for any strange noises coming from the hydraulic pump. A whining or grinding sound may indicate a pump issue.
  
• Check for Pressure Loss: Use a pressure gauge to check the hydraulic system’s pressure. If the pressure is too low, it may indicate a problem with the pump or a blockage in the lines.
  

Step 4: Check the Solenoid and Valve

• Inspect the Solenoid: Check the solenoid for any signs of wear or damage. Test the solenoid with a multimeter to ensure it’s receiving power and functioning properly.
  
• Test the Valve: If the solenoid is functioning correctly, inspect the valve controlling the auxiliary hydraulics. A stuck or faulty valve may need to be cleaned or replaced.
  

Step 5: Adjust Hydraulic Pressure Settings

• Check Pressure Settings: Verify that the hydraulic pressure settings are appropriate for the attachment being used. Adjust the pressure settings if necessary, following the manufacturer’s recommendations.
  

Preventative Maintenance Tips
To avoid auxiliary hydraulic issues in the future, regular maintenance is essential:

• Change Hydraulic Fluid: Regularly replace the hydraulic fluid to ensure proper lubrication and cooling.
  
• Inspect for Leaks: Routinely check all hydraulic hoses, connections, and cylinders for leaks.
  
• Clean the Filters: Clean or replace the hydraulic filters regularly to maintain optimal fluid flow.
  
• Keep the System Clean: Prevent contaminants from entering the hydraulic system by maintaining cleanliness around hydraulic connections.
  

Conclusion
The auxiliary hydraulics on the John Deere 319D are a critical component that allows the operator to use various attachments for different tasks. If the system is not working correctly, it could be due to issues such as low hydraulic fluid, faulty components, or blockages in the hydraulic lines. By following the troubleshooting steps outlined above and performing regular maintenance, you can keep your auxiliary hydraulics in top condition and ensure that your 319D remains a reliable workhorse on the job site.