Case 850G Hydraulic Pump Issue Diagnosis and Solutions

[MikePhua]

The Case 850G is a widely used tracked bulldozer in construction and earth-moving operations. Its hydraulic system plays a crucial role in the machine’s overall performance. The hydraulic pump is a core component of the hydraulic system, responsible for converting mechanical power into hydraulic energy to drive various functions of the bulldozer. If the hydraulic pump fails, it can significantly impact the machine’s efficiency and performance. This article will explore the common causes of hydraulic pump failures in the Case 850G and provide troubleshooting and solutions to address these issues.
Common Causes of Hydraulic Pump Failures

1. Low or Poor-Quality Hydraulic Oil
   Insufficient or poor-quality hydraulic oil is one of the most common causes of hydraulic pump failure. If the oil level is low, the pump’s suction capability is compromised, leading to inadequate hydraulic pressure and loss of performance. Additionally, contaminated hydraulic oil can cause excessive wear or clogging inside the pump.
   Solution: Regularly check the hydraulic oil level to ensure it is adequate. If the oil level is low, top it up with the appropriate oil. Additionally, inspect the oil for contamination. If the oil is dirty or has degraded, replace it and clean the hydraulic oil reservoir and filters.
   
2. Internal Wear of Hydraulic Pump Components
   Over time, components inside the hydraulic pump, such as pistons and gears, can wear down. Worn-out components will affect the pump’s performance, leading to unstable hydraulic pressure or complete pump failure.
   Solution: Periodically inspect the internal components of the hydraulic pump, particularly the pistons and gears. If significant wear is detected, replace the worn components to restore the pump’s normal operation.
   
3. Hydraulic Pump Leaks
   Leaks in the hydraulic pump’s seals or connections can lead to the loss of hydraulic oil, which in turn reduces the hydraulic pressure and affects the pump’s ability to function properly. Leaks are typically found in the high-pressure side or at connection points.
   Solution: Inspect all the connections and seals of the hydraulic pump for signs of leakage. If any leaks are found, replace the damaged seals and tighten any loose connections. Ensure the system is properly sealed after repairs.
   
4. Damaged Pump Shaft
   If the hydraulic pump shaft is damaged or bent, it can prevent the pump from operating correctly and may cause severe damage to the pump.
   Solution: Inspect the pump shaft for any signs of damage or deformation. If the shaft is found to be damaged, replace it and check the condition of the other pump components to ensure they are not affected.
   

Troubleshooting and Solution Process

1. Check Hydraulic Oil Level and Quality
   Start by checking the hydraulic oil level to ensure it is within the proper range. If the oil level is low, top it up with the correct oil. Also, inspect the oil for any signs of contamination or degradation. If the oil is dirty, replace it and clean the oil reservoir and filters.
   
2. Inspect Hydraulic Pump Internal Components
   Perform regular inspections of the pump’s internal components, including the pistons and gears. Look for any signs of excessive wear or damage. If components are worn, replace them promptly to maintain optimal pump function.
   
3. Check for Leaks in Seals and Connections
   Inspect the hydraulic pump’s seals and connections for any leaks. If any leaks are found, replace the damaged seals and ensure all connections are tightly secured.
   
4. Inspect the Pump Shaft
   Inspect the hydraulic pump shaft for any signs of damage or bending. If the shaft is damaged, replace it and check the overall condition of the pump.
   

Conclusion
The hydraulic pump is a vital component of the Case 850G bulldozer’s hydraulic system, and its performance directly impacts the machine's efficiency and safety. Regular maintenance and inspections are critical to ensure the pump operates at its full capacity. By following the troubleshooting process and addressing any issues promptly, operators can ensure the hydraulic pump functions properly, extending its lifespan and maintaining the bulldozer's performance.