Champion 710A No Hydraulics After Parking: Troubleshooting and Solutions

[MikePhua]

The Champion 710A motor grader is a versatile and powerful piece of equipment often used in construction, road maintenance, and grading tasks. Known for its rugged build and reliable performance, the 710A can tackle a variety of terrain and conditions. However, like any heavy machinery, it can experience issues from time to time. One common issue reported by operators is the loss of hydraulic power after the machine has been parked for a period of time. This article will delve into the potential causes of the hydraulic failure in the Champion 710A, explain how to diagnose the issue, and offer practical solutions for resolving the problem.
Hydraulic System in the Champion 710A
The hydraulic system in the Champion 710A motor grader is critical to its functionality. It powers the blade lift, steering, and various other functions that allow the machine to perform grading, cutting, and leveling tasks. The system typically operates using a gear pump, which draws hydraulic fluid from the reservoir and sends it through a series of valves and actuators to operate the equipment’s various hydraulic functions.
Understanding how the hydraulic system works and the common causes of failure is essential for diagnosing problems effectively. Below are some key components of the hydraulic system:

1. Hydraulic Pump: Responsible for drawing fluid from the reservoir and generating the pressure needed for the system.
   
2. Hydraulic Fluid Reservoir: Holds the hydraulic fluid necessary for the operation of the pump and system.
   
3. Control Valves: Direct the flow of hydraulic fluid to different parts of the system based on operator input.
   
4. Hydraulic Cylinders: Actuate movement in various parts of the machine, such as the blade or steering mechanisms.
   
5. Hoses and Lines: Carry hydraulic fluid between components.
   

Symptoms of Hydraulic Failure in the Champion 710A
When the Champion 710A motor grader experiences a hydraulic failure, operators may notice one or more of the following symptoms:

• Loss of Blade Functionality: The most common symptom is the inability to lift or adjust the grader blade. This usually occurs when the hydraulic fluid cannot reach the hydraulic cylinders that control the blade’s movement.
  
• Weak Steering: If the steering becomes unresponsive or sluggish, this may indicate a lack of hydraulic pressure in the steering mechanism.
  
• No Pressure at the Control Valve: If there is no pressure at the control valve or if the valve does not respond to operator input, the system may have an issue with fluid flow or pressure.
  
• Erratic Operation: The grader may experience jerky or inconsistent movement, especially in the blade control or steering.
  

Common Causes of Hydraulic Failure After Parking
Several factors can lead to a hydraulic failure after the machine has been parked. These include:

1. Hydraulic Fluid Leaks
   Leaks in the hydraulic system are a common cause of failure. Over time, seals and hoses can deteriorate, leading to fluid loss. When the grader is parked, the hydraulic system may lose enough pressure for the system to function properly once the machine is started again.
   
2. Air in the Hydraulic System
   Air trapped in the hydraulic lines can cause the system to lose pressure. Air can enter the system through leaks or from improper maintenance procedures, such as not properly bleeding the system after fluid changes.
   
3. Hydraulic Fluid Contamination
   Contaminants in the hydraulic fluid, such as dirt or water, can affect the system’s performance. These contaminants can cause blockages in the pump or valves, leading to a lack of fluid flow and loss of pressure.
   
4. Faulty Hydraulic Pump
   The hydraulic pump is responsible for generating the necessary pressure for the system. If the pump becomes worn out or fails, it may not generate enough pressure to operate the hydraulic functions. A pump failure can lead to total loss of hydraulic power, especially after the machine has been idle for a while.
   
5. Faulty Pressure Relief Valve
   The pressure relief valve is designed to protect the hydraulic system from overpressure. If this valve becomes stuck or malfunctioning, it can cause the system to lose pressure and lead to hydraulic failure.
   
6. Hydraulic Cylinder Issues
   If there are issues with the hydraulic cylinders, such as leaking seals or internal damage, this can also cause a loss of hydraulic power. The cylinders may not hold pressure, or they may not operate correctly when the grader is in use.
   

Steps to Diagnose and Fix the Hydraulic Issue
To effectively diagnose and fix hydraulic failure in the Champion 710A, follow these steps:

1. Inspect Hydraulic Fluid Levels
   • Check the hydraulic fluid reservoir to ensure it is at the proper level. Low fluid levels can lead to insufficient pressure, causing the system to fail. If the fluid is low, top it up with the correct type of hydraulic fluid as recommended by the manufacturer.
     
   • Inspect for signs of contamination or debris in the fluid. Dirty fluid can cause blockages or wear on system components.
     
2. Check for Leaks
   • Inspect all hydraulic hoses, connections, and seals for signs of leaks. Even small leaks can cause significant pressure loss over time. If you find any damaged hoses or fittings, replace them immediately.
     
   • Pay special attention to areas near the pump, control valve, and cylinders, as these are the most common places for leaks to occur.
     
3. Inspect and Test the Hydraulic Pump
   • If the hydraulic pump is not generating pressure, it may need to be replaced or repaired. To test the pump, measure the pressure at various points in the hydraulic system using a pressure gauge.
     
   • If the pump is faulty, consult the operator’s manual or a professional technician for guidance on how to replace or repair it.
     
4. Check the Pressure Relief Valve
   • The pressure relief valve regulates the hydraulic system’s pressure. If it is stuck or malfunctioning, the system will not maintain adequate pressure. Check the valve for any signs of wear or malfunction, and replace it if necessary.
     
5. Bleed the Hydraulic System
   • If air has entered the hydraulic system, you may need to bleed the system to remove the trapped air. Follow the manufacturer’s instructions for properly bleeding the system. This often involves loosening certain fittings to allow air to escape while the engine is running.
     
6. Examine Hydraulic Cylinders
   • Inspect the hydraulic cylinders for any signs of leaking seals or internal damage. If the seals are damaged, they will need to be replaced. If the cylinders are severely damaged, they may require rebuilding or replacement.
     

Preventive Maintenance to Avoid Hydraulic Issues
To prevent future hydraulic failures in the Champion 710A, consider the following preventive maintenance practices:

• Regular Fluid Checks: Always monitor the hydraulic fluid level and quality. Change the hydraulic fluid at regular intervals to avoid contamination buildup.
  
• Inspect Hoses and Seals: Periodically inspect the hoses and seals for wear and tear. Replace any damaged parts before they cause system failures.
  
• Clean Filters: Clean or replace hydraulic filters regularly to prevent contamination from entering the system.
  
• Monitor Pressure Levels: Ensure that the pressure relief valve and the pump are operating within the specified pressure range.
  
• Service Cylinders: Regularly inspect the cylinders for any leaks or signs of wear. Replace seals as necessary to prevent pressure loss.
  

Conclusion
Hydraulic failure in the Champion 710A motor grader can be caused by a variety of issues, including fluid leaks, air in the system, pump failure, and hydraulic cylinder problems. Diagnosing and fixing these issues requires a systematic approach, starting with fluid level checks and moving through a thorough inspection of the pump, valves, and hoses. By following a proactive maintenance schedule, you can ensure that the hydraulic system remains in good working condition, preventing downtime and costly repairs. If the problem persists after troubleshooting, seeking professional assistance may be necessary to ensure the grader operates at peak performance.