CAT 299D2 XHP 2018 Build Fault Code 350-3 Troubleshooting and Solutions

[MikePhua]

Some users of the CAT 299D2 XHP (2018 model) skid steer have reported the appearance of fault code 350-3 on their display. This fault code is typically related to the hydraulic system or sensors, causing the machine to operate incorrectly or fail to function at full capacity. Users are seeking to understand the cause of this fault code and how to resolve it. This article will analyze the potential causes and provide solutions for troubleshooting and fixing the issue.
Issue Analysis

1. Meaning of Fault Code 350-3
   Fault code 350-3 is often associated with a fault in the hydraulic system’s pressure sensor or control module. It may indicate that the hydraulic system's pressure is outside the preset range, or that the pressure sensor is not transmitting the correct pressure data to the control module. This issue can affect the normal operation of the hydraulic system, leading to reduced power output or abnormal performance of the machine.
   
2. Hydraulic System Issues
   A common cause of fault code 350-3 is a failure or poor connection of the pressure sensor in the hydraulic system. A malfunctioning or misreading sensor can cause abnormal hydraulic pressure, triggering the fault code. Additionally, contamination in the hydraulic fluid, low oil levels, or air in the system can also contribute to this problem.
   
3. Control Module Failure
   The control module plays a vital role in the hydraulic system. If the control module fails or has connectivity issues, it can result in incorrect transmission of pressure data, leading to fault code 350-3. Issues with the wiring or failure of the module itself may prevent proper communication with the hydraulic system.
   
4. Electrical System Issues
   Electrical connection or circuit faults are another potential cause of fault code 350-3. Loose or damaged connections between the pressure sensor, control module, or other electrical components can lead to abnormal signal transmission, triggering this fault code.
   

Solutions

1. Inspect the Hydraulic Pressure Sensor
   Check the hydraulic pressure sensor for any damage or malfunction. Ensure the sensor’s electrical connections are secure and free from corrosion or wear. If the sensor is faulty, replace it with a new one to restore proper function.
   
2. Check Hydraulic Fluid and Oil Levels
   Inspect the hydraulic fluid for cleanliness and check the oil level to ensure it is within the recommended range. If the hydraulic fluid is contaminated or the oil level is too low, replace the fluid and top it up to the correct level. Bleed the system if necessary to remove any trapped air, restoring proper pressure.
   
3. Check the Control Module and Electrical Connections
   Inspect the control module for any issues and verify the condition of its electrical connections. Ensure all connectors and interfaces are properly secured, with no loose or damaged components. If electrical contact issues are found, repair or replace the faulty parts to ensure proper communication between the control module and the hydraulic system.
   
4. Use Diagnostic Tools for Further Troubleshooting
   Use CAT’s diagnostic tools (such as the ET diagnostic tool) for more detailed troubleshooting. By reading fault codes and monitoring real-time data from the machine, the root cause of the problem can be more accurately identified, and the appropriate repairs can be made.
   

Conclusion
The fault code 350-3 on the CAT 299D2 XHP (2018 model) skid steer is commonly caused by issues with the hydraulic pressure sensor, control module failure, or electrical connection problems. By inspecting the pressure sensor, checking the hydraulic fluid and oil levels, and ensuring the control module and electrical connections are in good condition, the issue can be resolved. Additionally, using CAT’s diagnostic tools for in-depth troubleshooting will help pinpoint the exact cause and ensure the proper functioning of the machine. Regular maintenance and checks on the hydraulic system will help keep the equipment running smoothly and improve overall work efficiency.