T190 Auxiliary Hydraulics: Troubleshooting and Maintenance Guide

[MikePhua]

Introduction
The Bobcat T190 is a highly versatile skid-steer loader, known for its reliable performance and compact design. One of the key features that enhance the functionality of the T190 is its auxiliary hydraulics system. The auxiliary hydraulics allow the machine to power a wide range of attachments, such as augers, hydraulic breakers, and snow blowers, making it a valuable tool in various construction and landscaping tasks. However, like any hydraulic system, issues can arise that may affect the performance of the auxiliary hydraulics. This article explores common problems, troubleshooting steps, and maintenance tips to keep the T190 auxiliary hydraulics running smoothly.
Understanding the Auxiliary Hydraulics System
The auxiliary hydraulics on the T190 are designed to provide additional power to attachments that require hydraulic fluid to operate. The system consists of several key components:

• Auxiliary Hydraulic Lines: These lines carry pressurized hydraulic fluid from the main hydraulic system to the attachment.
  
• Hydraulic Control Valve: The valve controls the flow of fluid to the attachment, allowing the operator to manage the hydraulic power.
  
• Quick Couplers: These are used to quickly connect or disconnect hydraulic attachments to the loader, making it easy to switch between tasks.
  
• Pressure Relief Valve: This safety component ensures that the system does not exceed the maximum pressure, preventing damage to the hydraulics.
  

Common Issues with T190 Auxiliary Hydraulics
While the T190 is built to handle demanding tasks, several issues can affect the performance of the auxiliary hydraulics system. The most common problems include:

1. Weak or No Hydraulic Power:
   • Symptoms: The auxiliary attachment operates slowly or not at all, despite the engine running normally.
     
   • Possible Causes: Low hydraulic fluid levels, air in the hydraulic lines, or a malfunctioning hydraulic pump can cause this issue.
     
2. Leaking Hydraulic Fluid:
   • Symptoms: Visible hydraulic fluid leaking from the hoses, couplers, or other system components.
     
   • Possible Causes: Worn-out seals, loose connections, or damaged hydraulic hoses may be the culprit.
     
3. Inconsistent Attachment Operation:
   • Symptoms: The hydraulic attachment operates intermittently, or only certain functions (e.g., lifting, tilting) work.
     
   • Possible Causes: Blockages in the hydraulic lines, malfunctioning control valves, or issues with the attachment itself.
     
4. Overheating:
   • Symptoms: The hydraulic system runs excessively hot, causing fluid breakdown and reduced performance.
     
   • Possible Causes: Contaminated hydraulic fluid, insufficient fluid levels, or overworked hydraulics.
     
5. Erratic or Sticking Valve Action:
   • Symptoms: The control valve does not respond smoothly to input, or the movement is jerky.
     
   • Possible Causes: Dirt or debris in the valve, damaged seals, or faulty internal components.
     

Troubleshooting T190 Auxiliary Hydraulics

1. Check Hydraulic Fluid Levels:
   • Action: Ensure the hydraulic fluid is at the proper level. Low fluid levels can cause inadequate pressure and slow performance. Top up with the recommended hydraulic fluid if necessary.
     
   • Tip: Check for signs of fluid contamination or degradation. If the fluid looks milky or dirty, consider performing a fluid change.
     
2. Inspect for Leaks:
   • Action: Examine the hydraulic hoses, fittings, quick couplers, and seals for any signs of leakage. Tighten any loose connections and replace any damaged hoses or seals.
     
   • Tip: Use hydraulic oil-resistant tape on small leaks, but replace hoses or fittings as soon as possible for a permanent fix.
     
3. Bleed the System:
   • Action: Air in the hydraulic lines can lead to weak or erratic operation. To bleed the system, run the T190 while operating the auxiliary hydraulics, allowing any trapped air to escape. Make sure all connections are tight before doing this.
     
   • Tip: Keep the hydraulic fluid cap off when bleeding the system to allow air to escape more freely.
     
4. Check and Clean the Control Valve:
   • Action: If the attachment operates inconsistently, inspect the control valve for dirt or blockages. Clean or replace the valve if necessary.
     
   • Tip: Use a soft brush or compressed air to clean the valve, being careful not to damage the delicate components.
     
5. Test the Hydraulic Pump:
   • Action: A malfunctioning hydraulic pump can cause weak or no hydraulic power. If all other components seem to be in good condition, test the pump to ensure it is operating within the manufacturer’s specifications.
     
   • Tip: If the pump is underperforming, it may need to be rebuilt or replaced.
     
6. Check for Overheating:
   • Action: If the hydraulic system is overheating, inspect the cooling system for any blockages or issues with the radiator. Ensure the hydraulic fluid is fresh and properly filtered.
     
   • Tip: Operate the T190 at lower speeds and avoid excessive use of the auxiliary hydraulics for extended periods to prevent overheating.
     

Maintaining T190 Auxiliary Hydraulics

1. Regular Fluid Changes:
   • Change the hydraulic fluid as part of your routine maintenance schedule. Fresh fluid ensures optimal performance and prevents damage to the system. Follow the manufacturer's recommendations for fluid types and change intervals.
     
2. Inspect Hoses and Connections:
   • Periodically check all hoses, connections, and couplers for wear and tear. Replacing worn hoses and seals before they fail can prevent costly repairs and downtime.
     
3. Clean Filters:
   • The auxiliary hydraulic system uses filters to prevent contaminants from entering the system. Clean or replace the filters regularly to maintain smooth operation and extend the lifespan of the components.
     
4. Monitor System Pressure:
   • Use a pressure gauge to check the system’s hydraulic pressure. Ensure that it remains within the specified range to avoid overloading the system.
     
5. Proper Attachment Use:
   • Be mindful of the limits of each hydraulic attachment. Overloading attachments or using them incorrectly can strain the auxiliary hydraulics and lead to premature wear.
     

Conclusion
The Bobcat T190’s auxiliary hydraulics system is an essential feature that enhances its versatility for various tasks. Understanding common issues, performing regular maintenance, and troubleshooting effectively will ensure that the system operates efficiently and reliably. Whether you’re dealing with leaks, low power, or overheating, addressing these issues early on can help prevent major failures and keep your machine running at its best for years to come.