Bobcat 873 Lift and Tilt Backwards Issue

[MikePhua]

The Bobcat 873 is a well-regarded skid steer loader that, like many other machines, can encounter mechanical problems over time. One common issue reported by operators is when the lift and tilt functions of the machine work in reverse, which can cause serious safety concerns and operational inefficiencies.
Possible Causes of Lift and Tilt Backwards

1. Hydraulic Valve Malfunctions: The most likely cause of the issue is a malfunctioning hydraulic valve. This valve controls the flow of hydraulic fluid to the lift and tilt cylinders. If the valve sticks or is improperly calibrated, it could cause the lift and tilt functions to operate in reverse.
   
2. Hydraulic Hose or Line Issues: A leaking or damaged hydraulic hose or line can cause improper pressure distribution. This could lead to the lift and tilt functions not responding as expected, and potentially moving in the wrong direction.
   
3. Electrical Problems: The Bobcat 873 has electronic components that control hydraulic functions. If there is an electrical fault such as a faulty switch, sensor, or wiring, it could send incorrect signals to the hydraulic system, causing the lift and tilt to operate in reverse.
   
4. Control Lever or Joystick Issues: The control levers or joysticks used to operate the lift and tilt functions may have worn-out or misaligned components. This can result in the wrong direction of movement or inconsistent operation.
   

Troubleshooting the Problem

1. Check the Hydraulic Fluid: The first step in troubleshooting this issue is to inspect the hydraulic fluid levels. Low or contaminated fluid can cause erratic hydraulic performance. Ensure the fluid is clean and at the proper level.
   
2. Inspect the Hydraulic Valves: Examine the hydraulic valve that controls the lift and tilt functions. If it appears dirty or damaged, clean or replace it as necessary. Check if the valve is sticking or if it’s misadjusted.
   
3. Inspect Hoses and Lines: Check all hydraulic hoses and lines for leaks, cracks, or damage. If any hoses are compromised, replace them to ensure proper fluid pressure.
   
4. Examine Electrical Components: Inspect the electrical wiring, switches, and sensors associated with the hydraulic system. Look for loose connections, corrosion, or damaged wiring. A multimeter can be used to check the signals from the sensors to ensure they are working correctly.
   
5. Test the Joystick or Control Lever: Test the control lever or joystick for proper movement and response. If there is any resistance, or if the lever feels loose or unresponsive, it may need adjustment or replacement.
   

Solutions for Lift and Tilt Issues

1. Hydraulic Valve Repair: If the valve is found to be the source of the problem, repair or replacement may be necessary. Adjusting the valve for proper operation could resolve the issue.
   
2. Replace Damaged Hoses or Lines: If any hydraulic hoses or lines are damaged or leaking, replace them immediately. Ensure the new hoses are properly routed to avoid future damage.
   
3. Electrical Repairs: If the problem is traced back to an electrical fault, repair or replace the faulty wiring, switches, or sensors. Ensure that all connections are clean and secure to avoid future electrical issues.
   
4. Joystick or Lever Adjustment: If the joystick or control lever is causing the issue, it may need to be recalibrated or replaced. Ensure the control system is functioning smoothly.
   

Preventive Measures

1. Regular Hydraulic System Maintenance: Regularly inspect and maintain the hydraulic system, including valves, hoses, and fluid levels. Clean filters and check for leaks or damage.
   
2. Electrical System Checkups: Perform periodic checks on the electrical system, ensuring that all connections are secure and free of corrosion. This will help prevent electrical issues that could affect hydraulic operations.
   
3. Operator Training: Ensure that operators are well-trained on the correct use of the lift and tilt functions, including proper speed and handling. This can help prevent unnecessary wear and tear on the system.
   

Conclusion
A Bobcat 873 exhibiting lift and tilt functions that operate backwards can often be traced back to issues within the hydraulic system, electrical components, or the control mechanisms. By conducting a thorough inspection and addressing the potential causes, operators can restore normal function and avoid costly repairs. Regular maintenance and operator awareness are key to preventing such issues in the future.