Bobcat 753G Skid Steer Hydraulic Temperature Alarm Troubleshooting

[MikePhua]

The Bobcat 753G skid steer loader may experience a hydraulic temperature alarm, causing the machine to shut down unexpectedly. A hydraulic temperature alarm typically indicates an issue with the hydraulic system, such as high oil temperature or poor oil flow. If left unresolved, this problem can lead to hydraulic system damage and reduced equipment performance. Below are common causes and solutions to help users troubleshoot and fix the hydraulic temperature alarm issue.
Common Causes

1. High Hydraulic Oil Temperature: Excessive hydraulic oil temperature is the most common reason for the hydraulic temperature alarm. This can be caused by prolonged high-load operation, insufficient hydraulic oil, or poor oil quality.
   
2. Hydraulic Pump Failure: If the hydraulic pump is malfunctioning, it can result in inadequate oil flow, causing the oil temperature to rise. Pump wear or damage can affect the normal oil circulation.
   
3. Oil Cooler Failure or Blockage: The hydraulic oil cooler plays a key role in controlling oil temperature. If the cooler fails or is clogged with debris, it can lead to high oil temperatures and trigger the alarm.
   
4. Clogged Hydraulic System Filters: If the hydraulic system filters become clogged with dirt or debris, it can restrict oil flow, causing the oil temperature to rise.
   
5. Cooling System Issues: A malfunctioning cooling system, such as a faulty fan, can prevent the hydraulic oil from effectively dissipating heat, leading to high oil temperatures.
   

Diagnostic Steps

1. Check Hydraulic Oil Temperature: First, check the hydraulic oil temperature to ensure it is within the normal range. If the oil temperature is too high, stop the machine and allow the oil to cool to a safe temperature.
   
2. Check Hydraulic Oil Quality and Quantity: Verify the hydraulic oil level and quality. If the oil is low or the quality is poor, top up or replace the hydraulic oil with the correct type.
   
3. Inspect Oil Cooler and Cooling System: Examine the hydraulic oil cooler for any blockages or debris. Ensure the oil cooler fan is working properly. Clean the cooler and check the fan for proper operation.
   
4. Inspect Hydraulic Pump: Check the hydraulic pump for any signs of wear or damage. If the pump is malfunctioning, replace it to ensure proper oil flow.
   
5. Inspect Hydraulic System Filters: Check the hydraulic system filters for any blockages. If the filters are clogged, clean or replace them to restore proper oil flow.
   

Solutions

1. Replace or Top Up Hydraulic Oil: If the hydraulic oil quality is poor or the oil level is low, replace the oil or add the correct type of hydraulic oil to ensure it is at the proper level.
   
2. Clean Oil Cooler and Cooling System: Regularly clean the oil cooler to ensure there is no debris obstructing airflow. Check that the fan is functioning properly to ensure effective cooling.
   
3. Repair or Replace Hydraulic Pump: If the hydraulic pump is damaged or malfunctioning, replace it to ensure the oil flows properly through the system.
   
4. Clean or Replace Hydraulic Filters: If the hydraulic system filters are clogged, clean or replace them to restore proper oil flow and prevent overheating.
   

Conclusion
The hydraulic temperature alarm in the Bobcat 753G skid steer loader is often caused by high hydraulic oil temperature, pump failure, blocked oil coolers, or clogged system filters. By regularly checking the hydraulic oil, oil cooler, and system components, users can prevent high oil temperature and hydraulic system failures. Prompt diagnosis and repair of these issues will not only restore the machine’s proper operation but also extend the life of the hydraulic system.