Troubleshooting Bobcat 763 Skid Steer: No Bucket Function, But Travels Fine

[MikePhua]

The Bobcat 763 skid steer is a popular piece of equipment known for its versatility and ability to handle a variety of attachments. However, like any machine, it can experience issues that need quick attention to prevent downtime. One common issue that operators might face is a situation where the Bobcat 763 will travel normally but the bucket (or attachment) doesn’t function. This problem can be frustrating, especially when the machine’s mobility is unaffected, but the loader function is compromised. In this article, we will explore the possible causes of this issue, how to diagnose it, and what steps can be taken to resolve it.
Understanding the Bobcat 763 Skid Steer
The Bobcat 763 is part of the 700 series of skid steers, known for their compact size, high lifting capacity, and versatility in various industries, including construction, agriculture, and landscaping. It is equipped with a hydraulic system that controls the bucket, lift arms, and attachments. The loader’s travel functions—forward and backward—are powered by the machine’s drive motors, while the hydraulic system powers the lifting and tilting functions of the bucket or other attachments.
The hydraulic system is vital for operating the bucket. Any issue within this system can directly affect the loader's ability to raise, lower, or tilt the bucket, even if the machine can still move forward and backward without problems.
Diagnosing the Problem: No Bucket Function
When the Bobcat 763 skid steer experiences a situation where it will travel but the bucket does not function, it’s important to diagnose the root cause quickly to minimize downtime. Below are some common reasons for this issue:
1. Hydraulic System Failure
The most likely culprit when a Bobcat 763 will move but the bucket does not work is a hydraulic issue. Hydraulic systems use fluid to power the lift arms and other attachments, including the bucket. If there is a loss of hydraulic pressure or fluid, the bucket will be unable to operate, even though the drive motors still function properly.
Common Hydraulic Issues

• Hydraulic Fluid Leaks: A significant drop in fluid levels due to a leak can prevent the hydraulic system from building enough pressure to operate the bucket.
  
• Low Hydraulic Fluid: If the hydraulic fluid is low, it can result in insufficient pressure for lifting or tilting the bucket, though it may still allow the drive system to work.
  
• Faulty Hydraulic Pump: The hydraulic pump is responsible for pressurizing the fluid. If the pump is malfunctioning, the system may not produce enough pressure to power the bucket, even though the drive motors continue to work.
  
• Clogged Hydraulic Filter: A clogged or dirty hydraulic filter can restrict the flow of hydraulic fluid to the lift arms and bucket, preventing them from operating properly.
  
• Damaged Hydraulic Lines: Leaks or damage to hydraulic hoses or lines can reduce fluid pressure, leading to issues with bucket operation while still allowing the machine to move.
  

2. Electrical Issues with the Joystick Controller
Another potential cause of the issue could be electrical. The Bobcat 763 uses a joystick controller to manage the loader’s functions, including the bucket. If there is an electrical problem with the joystick, such as a wiring issue or a faulty controller, it could fail to send the correct signals to the hydraulic system, causing the bucket to remain inactive.
Electrical Problems to Check

• Faulty Joystick Controller: The joystick itself may be worn out or malfunctioning, preventing it from sending the correct signals to the hydraulic system.
  
• Wiring or Connector Issues: Damaged or loose wiring connections between the joystick and the control system can interrupt the signal transmission needed to operate the bucket.
  
• Blown Fuses: A blown fuse in the electrical circuit that controls the loader’s hydraulic functions can prevent the bucket from moving, though the travel system may still be functional.
  

3. Safety Switches or Interlocks
Many modern skid steers, including the Bobcat 763, are equipped with safety switches or interlock systems that prevent certain operations when specific conditions are not met. If these safety switches or interlocks are malfunctioning or not properly engaged, it may prevent the bucket from working.
Potential Safety Issues

• Seat Safety Switch: If the seat switch is not detecting the operator’s presence, it may disable certain functions, including the bucket.
  
• Boom or Lift Arm Safety Switch: If the boom or lift arms are not in the correct position or if there is a problem with the arm sensor, the system may prevent the bucket from operating.
  
• Hydraulic Lockouts: Some machines have hydraulic lockout features that prevent the use of certain functions during transport. If this lockout is stuck in the "on" position, it may prevent the bucket from working.
  

4. Hydraulic Cylinder Malfunction
If there is a problem specifically with the hydraulic cylinders that control the bucket’s movement, the bucket may become stuck in one position or fail to move altogether. The cylinders may develop internal issues such as a leaking seal or damage to the piston, which can cause a loss of pressure and prevent the bucket from functioning.
5. Control Valve Malfunction
The control valve is responsible for directing hydraulic fluid to the appropriate parts of the machine. A malfunction in the control valve could mean that the fluid is not being directed to the bucket’s hydraulic system, even though it may be going to the drive system. This can cause the bucket to stop working while the skid steer can still travel.
Steps to Troubleshoot and Fix the Problem
To fix the issue of a Bobcat 763 that travels but has no bucket function, follow these troubleshooting steps:

1. Check Hydraulic Fluid: Ensure that the hydraulic fluid is at the correct level. If it’s low, top it off with the correct type of fluid, and check for any visible leaks.
   
2. Inspect Hydraulic System: Look for any obvious hydraulic leaks, damaged hoses, or worn-out seals. A hydraulic system failure can often be traced back to a leak or insufficient fluid pressure.
   
3. Examine the Hydraulic Filter: Check the hydraulic filter for blockages. If the filter is clogged, replace it to allow proper fluid flow through the system.
   
4. Test the Joystick Controller: Check the joystick controller for any electrical issues. Ensure the wiring is intact and that the controller is sending the correct signals to the hydraulic system.
   
5. Check Safety Switches: Ensure that all safety switches, including the seat and lift arm switches, are functioning properly. If a switch is malfunctioning, it may be preventing the bucket from operating.
   
6. Inspect the Hydraulic Cylinders: If the problem seems isolated to the bucket itself, inspect the hydraulic cylinders for any signs of wear or damage. Replace any damaged cylinders or seals as needed.
   
7. Test the Control Valve: Ensure the control valve is functioning properly and that hydraulic fluid is being directed to the bucket’s hydraulic system.
   

Conclusion
If your Bobcat 763 skid steer is able to travel but the bucket is not functioning, the problem is likely related to the hydraulic system, electrical components, safety switches, or control valves. By following a systematic troubleshooting approach, operators can quickly identify and resolve the issue, minimizing downtime and getting the machine back into productive operation. Regular maintenance, including fluid checks, filter changes, and hydraulic inspections, is essential to keeping the Bobcat 763 and other heavy equipment running smoothly and avoiding unexpected issues in the future.