Restoring Hydraulic Valve Parts on Early 1970s John Deere 24 Skid Steer

[MikePhua]

The John Deere 24 Skid Steer, which debuted in the early 1970s, was a game-changer in the compact equipment market, offering impressive power in a small package. These machines were primarily used for construction, landscaping, and other light to medium-duty tasks, but as they aged, many operators faced issues with their hydraulic systems, specifically with the hydraulic valve components. Understanding the operation of these systems, the common problems associated with them, and how to address these challenges is crucial to keeping an older John Deere 24 in good working condition.
The Importance of Hydraulic Systems in Skid Steers
Skid steer loaders are known for their versatility and ability to work in tight spaces. A key component that allows them to perform a wide range of tasks is their hydraulic system, which powers the lift arms, bucket, and steering mechanism. The hydraulic valve, which controls the flow of hydraulic fluid, is one of the most vital components in this system. When these valves malfunction or wear out, it can lead to poor performance, reduced lifting capacity, or even complete system failure.
Common Issues with Hydraulic Valves in the JD 24 Skid Steer
As with any machine that has been in operation for decades, the hydraulic valves in the JD 24 Skid Steer may develop issues over time. Some of the most common problems encountered by owners of early 1970s JD 24 models include:
1. Leaks and Loss of Pressure
One of the most common issues with hydraulic valves is leakage, which can lead to a loss of hydraulic pressure. Over time, seals and o-rings in the valves can wear down, causing fluid to leak. This results in a decrease in system pressure, which impacts the efficiency of the loader and reduces its lifting capabilities.

• Symptoms: Reduced lifting power, sluggish or unresponsive hydraulic functions, visible fluid leaks around the valve or hydraulic lines.
  
• Possible Causes: Worn seals, cracked valve housing, or loose connections.
  

Solution: Regularly inspect the hydraulic valve seals for any signs of wear or cracking. Replacing worn seals and tightening any loose connections can help prevent further leaks. If the valve body itself is cracked, it may need to be replaced entirely.
2. Clogged Hydraulic Valves
Another issue that can arise is clogging within the hydraulic valves, typically caused by contamination in the hydraulic fluid. Dirt, debris, or degraded fluid can build up inside the valves, blocking the flow of hydraulic fluid and leading to poor performance.

• Symptoms: Jerky or uneven movement of the loader arms, slow response times, and erratic operation.
  
• Possible Causes: Contaminated hydraulic fluid, lack of proper fluid filtration, or prolonged use without cleaning.
  

Solution: Regularly flush the hydraulic system to remove old, contaminated fluid. Replace the fluid filters frequently, especially in machines that are used in dusty or dirty environments. If the clogging persists, the valve may need to be disassembled and cleaned to restore normal function.
3. Sticking Valves
Sticking valves are another common issue, often caused by the accumulation of dirt, debris, or a lack of proper lubrication. When a valve sticks, it can prevent the smooth flow of hydraulic fluid, resulting in erratic or slow movement.

• Symptoms: Unresponsive or delayed movements, or the loader arms remaining stuck in a raised position.
  
• Possible Causes: Dirt buildup, lack of proper lubrication, or aging components.
  

Solution: If a valve is sticking, it’s important to clean it thoroughly and lubricate the internal parts. If the valve remains stuck even after cleaning, it may require replacement.
4. Valve Wear
Over time, the moving parts within the hydraulic valves may wear out due to constant pressure and fluid flow. This wear can lead to a reduction in the valve’s ability to control the hydraulic fluid, affecting the overall performance of the machine.

• Symptoms: Inconsistent hydraulic pressure, inability to hold a load, or an increase in engine RPM when operating the loader.
  
• Possible Causes: Normal wear and tear from long-term use.
  

Solution: While some minor wear is inevitable in older equipment, it’s important to monitor for any signs of excessive wear, such as loose or noisy components. Regular maintenance and part replacement can help extend the life of the valve.
Steps to Replace or Repair Hydraulic Valves
Repairing or replacing hydraulic valves in the John Deere 24 Skid Steer is a challenging but manageable task for those with mechanical knowledge and the right tools. Below is a basic outline of the steps involved in replacing or repairing the hydraulic valve.
1. Disassemble the Valve
Before beginning any work, ensure the machine is safely parked, the hydraulic pressure is released, and the hydraulic lines are disconnected. Remove any components that are obstructing access to the hydraulic valve. This may include the engine cover, side panels, and possibly the seat.
2. Inspect the Valve for Wear and Damage
Once you have access to the valve, inspect it thoroughly. Look for any signs of cracks, excessive wear, or other damage. Pay special attention to the seals, O-rings, and connections, as these are the most common culprits for leaks.
3. Clean and Replace Seals
If the valve appears to be functioning but is leaking, the issue is often a worn seal or O-ring. Clean the valve body and replace any worn seals. Use manufacturer-recommended seals to ensure proper fit and performance.
4. Flush the Hydraulic System
After repairing or replacing the valve, flush the hydraulic system to remove any debris or old fluid that may have accumulated during the repair process. This will help prevent future issues with contamination and ensure smooth operation.
5. Test the System
Once the valve is reassembled and the hydraulic system is refilled with fresh fluid, test the system to ensure it is operating correctly. Check for any signs of leaks, unusual noises, or erratic behavior in the hydraulic system.
Where to Find Replacement Parts for JD 24 Skid Steer
Finding parts for a vintage machine like the John Deere 24 can be challenging. However, there are several resources available for sourcing replacement parts:

• John Deere Dealers: Authorized John Deere dealerships may still carry parts or be able to order them directly from the manufacturer.
  
• Aftermarket Suppliers: Companies that specialize in aftermarket parts for older equipment can be a good source for hydraulic valve components.
  
• Salvage Yards: For those willing to get hands-on, a visit to a heavy equipment salvage yard may yield used or refurbished parts at a lower cost.
  
• Online Marketplaces: Websites like eBay or dedicated heavy equipment forums often have individuals selling parts or offering recommendations for where to find them.
  

Conclusion
The John Deere 24 Skid Steer, like many other pieces of vintage equipment, can still provide excellent service when properly maintained. While the hydraulic system, including the hydraulic valves, can pose challenges due to age and wear, most issues can be addressed with routine maintenance and careful repairs. By understanding the common problems and knowing how to resolve them, operators can continue to get maximum performance out of their JD 24 for years to come.
Whether you are replacing seals, cleaning clogged valves, or replacing worn-out parts, maintaining the hydraulic system is key to ensuring your John Deere 24 Skid Steer remains reliable and efficient.