Bobcat S185 Locking Up: Troubleshooting and Solutions

[MikePhua]

Introduction
The Bobcat S185 is a versatile and reliable skid-steer loader widely used in construction, landscaping, and agriculture. However, like any complex machinery, it can experience issues that hinder its performance. One such problem is the intermittent locking up of the machine during operation. This article delves into the potential causes of this issue, offers troubleshooting steps, and provides solutions to restore your S185 to optimal working condition.
Understanding the Problem
Operators have reported instances where the Bobcat S185 experiences sudden and unexpected lockups during operation. These lockups can manifest as a complete halt in movement or a sudden loss of hydraulic function. Such occurrences can be both frustrating and detrimental to productivity.
Potential Causes
Several factors can contribute to the locking up of the Bobcat S185:

1. Hydraulic System Issues: The hydraulic system is integral to the operation of the S185. Problems such as low hydraulic fluid levels, contaminated fluid, or malfunctioning hydraulic components can lead to performance issues. For instance, a slow hydraulic leak near the steering valve body, often due to worn or damaged seals, can cause erratic behavior .
   
2. Electrical System Malfunctions: The S185's electrical system controls various functions, including the traction lock and hydraulic systems. Faulty sensors, solenoids, or wiring can lead to unintended lockups. For example, issues with the traction lock override switch or hydraulic lockout system can cause the bucket tilt to lock unexpectedly .
   
3. Control Valve Problems: The control valve directs hydraulic fluid to various components. If the valve spools are leaking or malfunctioning, it can lead to unintended lockups. Operators have reported issues with the control valve, such as hydraulic drift or loss of function, which can be traced back to faulty valve seals or internal components .
   
4. Operator Error or Misuse: In some cases, improper operation or misuse can lead to lockups. For instance, engaging auxiliary hydraulics without proper attachment or inadvertently activating continuous flow can strain the system and cause lockups .
   

Troubleshooting Steps
To diagnose and address the locking up issue:

1. Inspect Hydraulic Fluid Levels and Quality: Ensure that the hydraulic fluid is at the recommended level and is clean. Contaminated or low-quality fluid can cause system malfunctions.
   
2. Check for Hydraulic Leaks: Examine the hydraulic system for any signs of leaks, especially around the control valve and steering linkage. Addressing leaks promptly can prevent further damage.
   
3. Test Electrical Components: Use a multimeter to check the resistance and functionality of solenoids, sensors, and switches. Replace any faulty components to restore proper operation.
   
4. Inspect Control Valve: If accessible, inspect the control valve for signs of wear or damage. Rebuilding or replacing faulty valve components can resolve issues related to hydraulic drift or loss of function.
   
5. Review Operator Practices: Ensure that all operators are trained and aware of proper machine operation procedures. Avoiding misuse can prevent unnecessary strain on the hydraulic and electrical systems.
   

Preventive Maintenance Tips
To prevent future lockup issues:

• Regularly Check Hydraulic Fluid: Monitor fluid levels and quality, and replace as needed.
  
• Inspect for Leaks: Regularly check for and address any hydraulic or fuel leaks.
  
• Test Electrical Components: Periodically test solenoids, sensors, and switches to ensure proper functionality.
  
• Train Operators: Provide training to operators on proper machine operation and maintenance procedures.
  

Conclusion
The intermittent locking up of the Bobcat S185 can be attributed to various factors, including hydraulic system issues, electrical malfunctions, control valve problems, and operator error. By systematically troubleshooting and addressing these potential causes, operators can restore their machines to optimal performance. Regular maintenance and operator training are essential to prevent future issues and ensure the longevity of the S185.