Case SR150 Skid Steer Electric Hydraulic Control Troubleshooting and Solution

[MikePhua]

The user encountered an issue with the electric hydraulic control system on the Case SR150 skid steer loader. The electric hydraulic control system operates the hydraulics via electronic signals, but a failure could cause the machine to respond sluggishly or even fail to operate completely. Troubleshooting the electric control system and ensuring its proper function is crucial to restoring the machine’s performance.
Troubleshooting Steps

1. Check the Battery and Electrical System
   The electric hydraulic system relies on the battery for power, and insufficient battery voltage or electrical system failures could prevent the hydraulic system from functioning correctly. Begin by checking the battery voltage to ensure it is adequate. If the battery voltage is low, try charging or replacing the battery. Also, inspect the electrical connections for looseness or corrosion to ensure all connections are secure.
   
2. Inspect Hydraulic Fluid and the Hydraulic System
   Hydraulic system issues can sometimes be traced to the hydraulic fluid. Check the fluid level to ensure it is sufficient and confirm that the fluid is not contaminated. Poor-quality or contaminated hydraulic fluid can hinder the system’s ability to transmit power effectively. Regularly replace the hydraulic fluid and check the hydraulic lines for leaks or blockages.
   
3. Check Electric Control Valves and Sensors
   The Case SR150 electric hydraulic control system uses several electric control valves and sensors. A faulty sensor may send incorrect signals, causing abnormal hydraulic operation. Use diagnostic tools to inspect the condition of the control valves and sensors. If any sensors are found to be faulty, replace them as necessary.
   
4. Inspect Hydraulic Pump and Motors
   The hydraulic pump and motors are key components of the electric hydraulic system. If the pump or motor fails, the hydraulic system cannot provide the necessary power. Check the pump and motor’s operational state and use diagnostic tools to monitor the pump’s pressure output. Listen for abnormal noises or vibrations that could indicate issues with the pump or motor.
   
5. System Reset and Recalibration
   If none of the above checks resolve the issue, try resetting the electric hydraulic system and recalibrating it. Follow the reset procedures outlined in the operator's manual to ensure the control system properly responds to input signals and returns to normal operation.
   

Conclusion
The electric hydraulic control system issues in the Case SR150 skid steer are often caused by problems in the electrical system, hydraulic fluid, electric control valves, sensors, or the hydraulic pump and motor. By systematically checking the battery, electrical system, hydraulic fluid, sensors, and electric control valves, users can identify the root cause of the issue and perform necessary repairs. Regular maintenance of the electric hydraulic system can improve operational efficiency and extend the machine's lifespan.