CAT 247B Auxiliary Hydraulics Stopped Working Troubleshooting

[MikePhua]

A user encountered a problem with the auxiliary hydraulics on their CAT 247B skid steer, which stopped working while the main hydraulic system continued to function normally. This issue prevented the machine from performing tasks that require the auxiliary hydraulics. A detailed troubleshooting process was necessary to identify the root cause and determine the appropriate solution.
Troubleshooting Steps

1. Check Hydraulic Oil Level and Quality
   The first step is to check the hydraulic oil level. If the oil is low, it can prevent the hydraulic system from functioning properly. Ensure the oil is within the operating range and is not contaminated. If the oil quality is poor or contains contaminants, it should be replaced.
   
2. Inspect the Hydraulic Pump
   The hydraulic pump is a critical component of the hydraulic system. If the pump’s drive mechanism is faulty or the pump itself is malfunctioning, the hydraulic system will not be able to generate enough pressure to power the auxiliary hydraulics. Inspect the pump for any issues such as oil leaks or abnormal noises. If necessary, replace the pump.
   
3. Check the Control Valve
   The control valve that regulates the auxiliary hydraulics could be malfunctioning or blocked, causing a lack of hydraulic flow. Inspect the control valve to ensure it is functioning correctly and that there are no blockages or damage. If the valve is faulty, it may need to be repaired or replaced.
   
4. Examine Hydraulic Lines
   Inspect all hydraulic lines and connections to ensure there are no leaks or damage. Hydraulic oil leaks can result in low pressure, preventing the auxiliary hydraulics from working properly. If any leaks are found, repair or replace the damaged lines or components.
   
5. Check Electrical Connections and Sensors
   The auxiliary hydraulic system on the CAT 247B may be affected by electrical issues, especially if the system uses sensors or solenoids to control hydraulic flow. Check all electrical connections to ensure they are secure and that the sensors are functioning correctly. If there are issues with the electrical system, troubleshooting and repairing the electrical components may be necessary.
   
6. Inspect the Hydraulic Oil Filter
   A clogged hydraulic oil filter can restrict oil flow, affecting the system's performance. Regularly inspect and replace the hydraulic oil filter to ensure smooth operation of the system.
   

Solutions

1. Replace Hydraulic Oil: If the hydraulic oil is of poor quality or too low, replace it with the correct grade of oil and ensure the oil level is within the specified range.
   
2. Repair or Replace the Hydraulic Pump: If the hydraulic pump is damaged or not operating efficiently, it may need to be replaced to ensure the hydraulic system functions correctly.
   
3. Repair or Replace the Control Valve: If the control valve is faulty or obstructed, clean or replace it to allow proper hydraulic flow.
   
4. Fix Hydraulic Leaks: Check and repair any hydraulic line leaks to maintain proper pressure in the system.
   
5. Inspect and Repair the Electrical System: If there are issues with the electrical system, inspect all electrical connections and sensors, and replace any faulty components.
   
6. Replace the Hydraulic Oil Filter: Ensure the hydraulic oil filter is clean and replace it if necessary to prevent flow restrictions.
   

Conclusion
The auxiliary hydraulic system on the CAT 247B skid steer may stop working due to a variety of causes, including hydraulic oil issues, pump failure, control valve malfunction, hydraulic line leaks, or electrical system problems. By systematically troubleshooting these potential issues, the user can pinpoint the root cause and take corrective actions. Regular maintenance and checks are essential to keeping the hydraulic system in good working condition and preventing major failures.