Bobcat 773 Creep Issues: Causes and Solutions

[MikePhua]

The Bobcat 773 is a popular skid-steer loader that is widely used for a variety of tasks in construction and landscaping. However, some operators have reported experiencing “creep,” a situation where the machine continues to move even after the operator has released the joystick or controls. This article will explore the potential causes of creep in the Bobcat 773, as well as troubleshooting steps and solutions to fix the problem.
Understanding Creep in the Bobcat 773

1. What is Creep?
   Creep is the phenomenon where the Bobcat 773 continues to move in a particular direction after the operator has released the joystick or lever. This can be particularly troublesome when precision control is required, as the machine may move unexpectedly.
   • Why It Matters: Creep can cause safety concerns, difficulty in positioning, and increased wear on the machine if left unresolved. Proper diagnosis and quick repairs are essential to ensure the equipment runs safely and efficiently.
     
2. Common Symptoms of Creep
   • Continuous Forward/Reverse Movement: The machine continues moving forward or backward even when the controls are in neutral.
     
   • Erratic or Uncontrolled Movement: The Bobcat 773 may move in a jerky or uncontrolled manner when the joystick is released.
     
   • Unintended Movement at Idle: The equipment may begin moving slightly while at idle, even though the operator isn’t actively engaging the controls.
     

Potential Causes of Creep

1. Joystick Calibration Issues
   One of the most common causes of creep in Bobcat 773 skid steers is improper joystick calibration. If the joystick is not properly calibrated, it can send incorrect signals to the machine’s hydraulic system, causing the loader to move unintentionally.
   • Solution: Check the joystick calibration settings to ensure they are set correctly. If the calibration is out of adjustment, follow the manufacturer's procedure to reset it. This typically involves adjusting the joystick’s neutral position.
     
2. Hydraulic System Problems
   Creep can also occur if there are issues with the hydraulic system. This could be due to air in the system, a stuck or faulty valve, or low hydraulic fluid levels. The hydraulic system controls the movement of the loader, and any issues here can lead to unintended movement.
   • Solution: Check the hydraulic fluid levels to ensure they are within the recommended range. If the fluid is low, top it off with the correct type of fluid. If there is air in the hydraulic lines, bleeding the system can help resolve the problem. Additionally, inspect the hydraulic valves and actuators for any signs of wear or blockage.
     
3. Dirty or Worn Contactor Switches
   The contactor switches control the flow of electricity to the drive motors, and if they are dirty or worn, they may not fully disengage, causing creep.
   • Solution: Inspect the contactor switches for signs of wear or contamination. Clean the contacts, and if necessary, replace any faulty switches to ensure proper operation.
     
4. Faulty Drive Motors or Motor Controllers
   The drive motors on the Bobcat 773 are responsible for driving the wheels or tracks. If these motors or their controllers malfunction, it could cause creep, as the motors may not disengage when the joystick is released.
   • Solution: Test the drive motors and motor controllers to check for faulty wiring, malfunctioning parts, or a need for calibration. If a motor is found to be faulty, it may need to be replaced or repaired by a professional.
     
5. Worn or Faulty Linkage Components
   The linkage between the joystick and hydraulic valves may wear out over time. If these components are worn or damaged, it can cause improper movement of the machine, including creep.
   • Solution: Inspect the linkage for any signs of damage or wear. Tighten any loose components and replace worn parts to restore full control over the machine’s movements.
     

Steps to Troubleshoot and Fix Creep

1. Inspect the Joystick and Control Cables
   • Start by checking the joystick for any loose connections, signs of wear, or dirt that may be affecting its performance. If the joystick is dirty, clean it carefully to remove any debris.
     
   • Test the control cables to ensure they are operating smoothly and there is no resistance or binding that could affect the control of the machine.
     
2. Check Hydraulic Fluid and Pressure
   • Make sure the hydraulic fluid is at the proper level and that the fluid is clean. Low or contaminated fluid can cause erratic behavior in the hydraulic system, contributing to creep.
     
   • If the fluid is in good condition, check the hydraulic pressure to ensure it is within the specified range for the Bobcat 773.
     
3. Test and Calibrate the Controls
   • If the problem is related to the joystick calibration, perform a recalibration using the machine’s manual or service guidelines. This will ensure that the joystick’s neutral position is correctly set and that the hydraulic system responds properly to input.
     
4. Inspect and Clean the Contactors
   • If the contactors are dirty or malfunctioning, clean them carefully and replace any worn or damaged parts. A multimeter can be used to test for continuity and proper function.
     
5. Check for Wear in the Drive Motors and Linkage
   • Test the drive motors and motor controllers to ensure they are functioning properly. If any parts are damaged or not engaging properly, replace them as needed.
     
   • Inspect the linkage system and replace any worn components to ensure smooth operation of the joystick and hydraulic system.
     

Conclusion
Creep in the Bobcat 773 can be frustrating for operators and may lead to safety concerns or operational inefficiencies. The issue is often caused by faulty calibration, hydraulic system problems, or issues with the electrical and control systems. By following the troubleshooting steps outlined in this article, you can diagnose and fix the problem effectively. Regular maintenance and periodic inspections are key to preventing creep and ensuring that your Bobcat 773 continues to perform at its best.