Bobcat 763 Auxiliary Hydraulics and Bucket Leveling Troubleshooting

[MikePhua]

The Bobcat 763 Skid-Steer Loader, introduced in 1994, has been a reliable workhorse in various industries, from construction to landscaping. However, like any piece of machinery, it is not immune to issues. Two common problems reported by operators are the malfunctioning of auxiliary hydraulics and the failure of the bucket leveling system. Understanding these issues and their potential causes can help in diagnosing and rectifying the problems efficiently.
Auxiliary Hydraulics Malfunction
Auxiliary hydraulics are essential for operating attachments such as grapples, augers, and hydraulic hammers. When these systems fail, it can significantly hinder the loader's versatility. Common symptoms include:

• Inability to operate attachments despite the loader's hydraulic system being functional.
  
• Intermittent operation, where the auxiliary hydraulics work at times and fail at others.
  
• Unusual behavior when operating attachments, such as the bucket tilting in the opposite direction when attempting to raise it.
  

Several factors can contribute to these issues:

1. Solenoid Valve Malfunction: The solenoid valves control the flow of hydraulic fluid to the auxiliary circuits. A faulty solenoid can prevent the proper operation of attachments. Symptoms include the loader's auxiliary hydraulics working intermittently or not at all.
   
2. Electrical Issues: The auxiliary hydraulics are controlled by electrical signals. Loose connections, corroded terminals, or faulty wiring can disrupt these signals, leading to malfunction.
   
3. Hydraulic Fluid Problems: Low fluid levels, contaminated fluid, or air in the hydraulic system can cause erratic operation or complete failure of the auxiliary hydraulics.
   
4. Control Valve Issues: The control valve directs hydraulic fluid to various parts of the loader. If it becomes clogged or damaged, it can affect the performance of the auxiliary hydraulics.
   

Bucket Leveling System Failure
The bucket leveling system ensures that the bucket remains level during lifting and lowering operations, providing better load control and material handling. When this system fails, it can lead to uneven loads and decreased efficiency. Common causes include:

1. Control Module Settings: In some cases, the bucket leveling function may be disabled in the loader's control module settings. This can occur after repairs or maintenance, leading operators to believe the system has failed when it has simply been turned off.
   
2. Hydraulic Cylinder Issues: Worn or damaged hydraulic cylinders can cause the bucket to tilt unevenly, affecting the leveling system's performance.
   
3. Linkage Problems: The mechanical linkage between the bucket and the loader arms can wear out or become misaligned, leading to improper leveling.
   

Troubleshooting Steps
To diagnose and address these issues:

1. Check Electrical Connections: Inspect all wiring and connectors related to the auxiliary hydraulics and bucket leveling systems. Ensure that there are no loose or corroded connections.
   
2. Test Solenoids: Using a multimeter, check the solenoid valves for proper operation. Replace any faulty solenoids as needed.
   
3. Inspect Hydraulic Fluid: Check the hydraulic fluid level and condition. Replace contaminated fluid and bleed the system to remove any trapped air.
   
4. Examine Control Valves: Inspect the control valves for any signs of wear or blockage. Clean or replace as necessary.
   
5. Review Control Module Settings: If the bucket leveling system is not functioning, verify that the feature is enabled in the loader's control module settings.
   
6. Assess Mechanical Components: Inspect hydraulic cylinders and linkages for wear or damage. Replace or repair components as needed.
   

Preventive Maintenance Tips
To minimize the risk of these issues:

• Regularly inspect and clean electrical connections.
  
• Schedule routine hydraulic system maintenance, including fluid changes and filter replacements.
  
• Monitor the performance of auxiliary hydraulics and bucket leveling systems during operation.
  
• Address any unusual behavior promptly to prevent further damage.
  

Conclusion
The Bobcat 763 Skid-Steer Loader is a versatile and durable machine. By understanding the common issues related to auxiliary hydraulics and bucket leveling systems, operators can take proactive steps to maintain optimal performance. Regular maintenance and prompt attention to problems can extend the life of the loader and ensure efficient operation on the job site.