Gehl 5635 SXT II Auxiliary Hydraulics Not Reversing

[MikePhua]

The Gehl 5635 SXT II is a robust skid steer loader widely used in construction, agriculture, and other heavy-duty applications. However, like all machinery, it can encounter issues over time. One such problem reported by operators is the auxiliary hydraulics failing to reverse. This issue can significantly impact productivity, as many attachments depend on reversing hydraulic flow. This article will guide you through troubleshooting and resolving this issue, providing practical solutions for restoring proper hydraulic function.
1. Problem Symptoms
When the auxiliary hydraulics on the Gehl 5635 SXT II fail to reverse, operators may notice the following:

• Hydraulic functions operate as usual, but the auxiliary hydraulics cannot reverse the flow.
  
• Attachments or tools that require reversing the hydraulic flow, such as certain augers, forks, or snowblowers, fail to work as intended.
  

This issue typically points to problems with the hydraulic system or control mechanisms, such as hydraulic flow obstruction, valve malfunction, or electrical connection failure.
2. Troubleshooting Steps
When facing the issue of auxiliary hydraulics not reversing, follow these troubleshooting steps:

• Check Hydraulic Oil Levels and Quality: Begin by inspecting the hydraulic oil level. If the oil is too low, it can prevent the hydraulic system from functioning correctly. Also, examine the quality of the hydraulic oil. Contaminated or old oil can cause poor hydraulic performance. If necessary, top up or replace the oil to ensure it is clean and at the proper level.
  
• Inspect the Control Valve: The control valve regulates hydraulic flow. If the valve is malfunctioning or sticking, it may fail to reverse the flow of oil, causing the hydraulic system to be unresponsive. Inspect the valve for blockages, dirt, or wear, and clean or replace it as needed.
  
• Examine the Electrical System: The Gehl 5635 SXT II’s auxiliary hydraulic system is often tied to the electrical control system. If there are issues with the wiring or connections, the hydraulic system may not reverse properly. Check all electrical connections, ensure they are secure, clean, and free of damage or corrosion.
  
• Inspect Hydraulic Hoses and Lines: Leaks or blockages in the hydraulic hoses can also cause issues. Examine the hydraulic lines for any visible damage or leaks. If you find any leaks or kinks, repair or replace the hoses immediately to restore proper fluid flow.
  

3. Solutions
Based on the results of the troubleshooting steps, here are the solutions you can apply:

• Top Up or Replace Hydraulic Oil: If the hydraulic oil level is low, add oil until it reaches the required level. If the oil is contaminated or degraded, replace it and clean the system as necessary.
  
• Clean or Replace the Control Valve: If the control valve is damaged or clogged, clean it thoroughly or replace it if necessary. Periodically cleaning or replacing control valves can prevent this issue from reoccurring.
  
• Repair Electrical Connections: If there are any electrical issues, inspect the wiring, connections, and plugs. Clean any corrosion, tighten loose connections, and replace any damaged cables to ensure the hydraulic system operates correctly.
  
• Fix Hydraulic Hose Leaks: If you detect leaks in the hydraulic lines, immediately repair or replace the affected hoses. Properly secured and intact hydraulic lines are essential for optimal hydraulic system performance.
  

4. Preventive Maintenance Recommendations
To prevent future hydraulic issues and ensure the Gehl 5635 SXT II operates smoothly, consider implementing these preventive maintenance practices:

• Regularly Check Hydraulic Oil: Periodically check the hydraulic oil level and quality to prevent performance issues. Change the hydraulic oil and clean the filters at recommended intervals to keep the system running efficiently.
  
• Inspect Control Valves and Electrical Components: Regularly inspect the control valves and electrical components for wear or damage. Clean and lubricate as needed to ensure smooth operation of the hydraulic system.
  
• Check Hydraulic Hoses and Lines: Frequently inspect the hydraulic hoses for leaks, cracks, or wear. Replace any damaged hoses to prevent fluid loss and ensure consistent hydraulic performance.
  

5. Conclusion
The issue of auxiliary hydraulics not reversing on the Gehl 5635 SXT II is typically caused by low hydraulic oil, control valve malfunction, electrical connection failure, or hydraulic hose leaks. By following the troubleshooting steps and implementing the recommended solutions, operators can restore full functionality to their auxiliary hydraulic system. Regular maintenance and checks are key to preventing such issues from arising in the future, ensuring that the Gehl 5635 SXT II continues to operate at peak efficiency in demanding work environments.