Replacing the Lower Tilt Cylinder Bushing on Bobcat 873: A Step-by-Step Guide

[MikePhua]

The Bobcat 873 skid steer loader is a well-regarded piece of machinery, particularly known for its strong lifting capabilities and versatility. However, like all equipment, it requires regular maintenance and occasional repairs to keep it running efficiently. One common repair that owners and operators of the Bobcat 873 may encounter is the replacement of the lower tilt cylinder bushing.
This article aims to provide a comprehensive guide on how to replace the lower tilt cylinder bushing on a Bobcat 873, including some valuable insights from industry professionals, tips for preventing further issues, and the potential challenges you might face along the way.
Understanding the Lower Tilt Cylinder and Its Function
The lower tilt cylinder is a critical component in the tilt mechanism of the Bobcat 873’s lifting arm system. It controls the tilt angle of the bucket or attachment, allowing the operator to precisely control the angle during lifting, dumping, and grading tasks. Over time, this component can wear out, particularly the bushing that helps guide the cylinder as it extends and retracts. Worn or damaged bushings can cause a variety of issues, including a loose or sloppy tilt, reduced lift power, and even potential damage to other parts of the machine.
When these symptoms appear, it’s time to replace the bushing to restore the loader’s efficiency and extend the life of the tilt cylinder.
Step-by-Step Guide to Replacing the Lower Tilt Cylinder Bushing

1. Preparation and Safety
   Before beginning any repair work, make sure to park the Bobcat 873 on a level surface. Turn off the engine and engage the parking brake. It’s also a good idea to disconnect the battery to ensure your safety while working on the machine.
   
2. Remove the Lower Tilt Cylinder
   Begin by removing the pins and bolts securing the lower tilt cylinder to the lift arms. Depending on the year and model of your Bobcat 873, you may need a wrench or impact tool to loosen the fasteners. Once all pins and bolts are removed, carefully lift the cylinder off the machine using a hoist or a suitable lifting device.
   
3. Inspect the Tilt Cylinder
   Before proceeding with the bushing replacement, it’s important to inspect the entire tilt cylinder for any signs of wear or damage. Check for scoring, cracks, or excessive rust. If the cylinder itself is damaged, it may need to be repaired or replaced before proceeding.
   
4. Remove the Old Bushing
   With the cylinder removed, the next step is to extract the old bushing. This can be tricky, as bushings are often press-fit into place. In some cases, you may need to use a hydraulic press or a bushing removal tool to safely and efficiently remove the old bushing without damaging the surrounding components.
   
5. Clean and Prepare the Housing
   Once the old bushing is removed, thoroughly clean the housing where the new bushing will sit. It’s essential to remove any dirt, debris, or rust that could affect the performance of the new bushing. Use a wire brush or a suitable cleaning tool to ensure the surface is smooth and free of imperfections.
   
6. Install the New Bushing
   With the housing properly cleaned, it’s time to install the new bushing. Align the bushing with the housing and press it into place using a hydraulic press or a hammer and appropriate tools. Ensure the bushing is seated evenly and securely. Any misalignment could lead to uneven wear or potential damage to the new bushing.
   
7. Reassemble the Tilt Cylinder
   Once the new bushing is installed, reassemble the lower tilt cylinder by carefully reinstalling the piston and seals. Make sure all components are properly lubricated and that the seals are in good condition to prevent leaks.
   
8. Reinstall the Cylinder
   After reassembling the cylinder, it’s time to reinstall it onto the Bobcat 873. Position the cylinder back onto the lift arms and secure it with the pins and bolts. Make sure all fasteners are torqued to the manufacturer’s specifications to prevent loosening during operation.
   
9. Test the Tilt Function
   With everything reassembled, it’s time to test the machine. Start the Bobcat 873 and operate the tilt function to ensure smooth and responsive movement. Listen for any unusual noises, such as grinding or popping, which could indicate that the bushing was not installed correctly or that there are still issues with the tilt system.
   

Common Challenges and Troubleshooting
While replacing the lower tilt cylinder bushing on a Bobcat 873 is a relatively straightforward task, there are a few challenges that operators may encounter during the process. Here are some potential problems and solutions:

• Stuck or Seized Bushings
  In some cases, the old bushing may be extremely difficult to remove due to corrosion or wear. If you’re unable to remove the bushing by hand or using basic tools, consider using a hydraulic press or a specialized bushing puller. These tools can help remove the bushing without causing damage to the surrounding components.
  
• Misalignment
  When installing the new bushing, be sure to align it properly with the housing. If the bushing is misaligned, it can cause excessive wear or even damage the tilt cylinder. Use a precision tool to ensure the bushing is seated properly.
  
• Seal Damage
  When reassembling the tilt cylinder, be sure to inspect the seals for any signs of wear or damage. If the seals are compromised, they could cause hydraulic fluid leaks, which would affect the performance of the tilt system. Replacing seals is an easy way to prevent leaks and ensure the longevity of your repair.
  

Preventive Measures to Extend the Life of Your Bobcat 873 Tilt Cylinder
To avoid frequent repairs to the tilt cylinder and extend the lifespan of the components, regular maintenance is key. Here are some tips to keep your Bobcat 873 in good working condition:

• Lubricate Regularly: Ensure the tilt cylinder and other moving parts are properly lubricated to minimize wear and friction.
  
• Inspect Components: Regularly inspect the tilt cylinder, bushings, and seals for signs of wear or damage. Early detection can prevent major issues.
  
• Avoid Overloading: Never overload the Bobcat 873 with excessive weight, as this can put undue strain on the tilt mechanism and other components.
  

Conclusion
Replacing the lower tilt cylinder bushing on a Bobcat 873 is a manageable repair that can restore the functionality of the tilt system, improve operator control, and extend the life of the equipment. While it requires some time and attention to detail, this repair is an excellent way to keep your skid steer loader in top condition. By following the steps outlined in this article, you can ensure a successful bushing replacement and maintain the high performance of your Bobcat 873 for years to come.