L90C Third Valve: Enhancements and Troubleshooting Tips

[MikePhua]

The Volvo L90C wheel loader, part of Volvo's L-series lineup, is known for its robust build, reliability, and versatility across a range of industries, including construction, agriculture, and material handling. One of the notable features of the L90C is its hydraulic system, which can be enhanced with the addition of a third valve. This article delves into the role of the third valve, its installation, common issues, and troubleshooting tips for Volvo L90C owners.
Introduction to the Volvo L90C and Its Hydraulic System
The Volvo L90C is a mid-sized wheel loader that offers powerful lifting capabilities, combined with excellent operator comfort and low operating costs. It has been designed for a wide range of tasks, including lifting, transporting, and loading materials on construction sites, ports, and other industrial applications.
The L90C's hydraulic system is a key component that contributes to its versatility. The system is capable of powering various attachments, such as buckets, forks, and grapples. By adding a third valve, operators can expand the machine's capabilities further by controlling additional attachments, such as augers, rakes, or hydraulic breakers.
The Role of the Third Valve
The third valve, often referred to as the auxiliary valve, is an additional hydraulic control system that allows the operator to engage and control extra hydraulic attachments. The Volvo L90C is equipped with a standard two-valve system, but many operators opt to install the third valve to increase the loader's functionality.
The third valve is critical for tasks that require a separate hydraulic function, such as:

• Rotating attachments: Hydraulic attachments like rotating buckets or grapples require an independent hydraulic function to operate properly. A third valve makes this possible.
  
• Hydraulic breakers: If using a hydraulic hammer for breaking up concrete or rock, the third valve is essential for the control of the attachment.
  
• Augers and other specialized attachments: Attachments like augers or compactors also benefit from a third valve, as they require more control than the standard two-valve system provides.
  

By adding this third valve, users significantly expand the L90C's functionality, making it more adaptable for specialized tasks in construction and demolition projects.
Installing the Third Valve on the Volvo L90C
Installation of the third valve on the Volvo L90C is relatively straightforward, but it requires specific knowledge of the loader's hydraulic system. Here are the steps typically involved:

1. Selecting the Third Valve Kit: Volvo offers a third valve kit designed specifically for the L90C. This kit will include all the necessary components such as the valve, piping, hoses, and mounting hardware.
   
2. Disconnecting the Battery: Safety is paramount when working with heavy equipment. Before starting the installation, ensure that the battery is disconnected to prevent accidental electrical issues.
   
3. Accessing the Hydraulic System: To install the third valve, access must be made to the hydraulic lines and pump system of the loader. This typically involves removing the cover panels and inspecting the existing hydraulic connections.
   
4. Mounting the Third Valve: The third valve needs to be mounted securely in a location that allows for easy access to control levers and valves. The valve should be installed in line with the main hydraulic circuit.
   
5. Connecting Hoses and Wiring: Once the valve is mounted, hoses must be connected to the valve and the hydraulic system. Ensure that all connections are tight and properly sealed to prevent leaks.
   
6. Testing the System: After installation, it’s important to test the system by cycling the new valve and ensuring that the hydraulic attachments work as expected.
   

While this is a general overview of the installation process, it’s always recommended to follow the manufacturer’s instructions and, if needed, consult with a professional technician to ensure proper installation.
Common Issues with the Third Valve on the Volvo L90C
Even with proper installation, the third valve can experience issues due to wear, misuse, or maintenance oversight. Here are some common problems that operators might encounter:

1. Hydraulic Leaks
   • Cause: Over time, seals, hoses, or fittings can wear out, leading to hydraulic fluid leaks. Leaks can drastically reduce the efficiency of the hydraulic system and cause operational delays.
     
   • Solution: Regularly inspect all hydraulic lines, seals, and hoses for wear. Tighten or replace any loose or damaged parts. Keep hydraulic fluid levels at the recommended levels and use high-quality fluid to prevent contamination.
     
2. Inconsistent Operation
   • Cause: If the third valve is not functioning consistently, it could be due to air in the hydraulic lines, a clogged filter, or low hydraulic fluid pressure.
     
   • Solution: Bleed the air out of the hydraulic system, replace the hydraulic filter, and check the hydraulic fluid pressure. If the problem persists, consult with a technician to check the valve for wear.
     
3. Control Issues
   • Cause: Sometimes the control lever for the third valve can become unresponsive or difficult to operate. This could be due to problems with the valve spool or linkage.
     
   • Solution: Inspect the control lever and valve linkage for any obstruction or damage. Lubricate the moving parts, and if the problem continues, disassemble the valve to check for internal damage.
     
4. Overheating
   • Cause: The third valve can contribute to overheating if there’s a high demand on the hydraulic system or if the oil temperature rises beyond the normal range.
     
   • Solution: Check the hydraulic oil temperature and ensure that the cooling system is functioning correctly. Overheating can also result from insufficient hydraulic fluid or excessive load on the valve.
     

Maintenance Tips for the Third Valve
Regular maintenance of the third valve and associated hydraulic system is essential to keep the Volvo L90C running smoothly. Here are some maintenance tips:

• Check Fluid Levels: Always ensure that the hydraulic fluid is at the correct level. Low fluid can lead to inefficient operation and potential damage to the system.
  
• Inspect Hoses and Seals: Periodically check for wear and tear on hydraulic hoses and seals. Replace any parts that show signs of cracking, bulging, or other damage.
  
• Monitor Performance: Keep an eye on the loader’s performance, especially when using attachments connected to the third valve. Any signs of sluggish operation or unusual noise could indicate a hydraulic issue.
  
• Clean the Valve and System: Keep the hydraulic system, including the valve, clean to prevent contamination. Contaminants in the fluid can lead to wear on internal components and cause operational issues.
  

Conclusion: Expanding the Volvo L90C's Capabilities
The third valve is a powerful upgrade for the Volvo L90C, providing the flexibility needed to handle a wide variety of hydraulic attachments. With the right maintenance and troubleshooting practices, the L90C loader can be equipped to tackle more specialized tasks, increasing productivity and efficiency on the job site.
By understanding the role of the third valve, properly installing it, and addressing common issues, operators can ensure that their Volvo L90C continues to perform optimally for many years. With the loader’s versatile capabilities and reliable design, it remains a valuable asset for any fleet or contractor in the construction industry.