Wheel Bearing Maintenance on Bobcat 773 Skid Steer: Ensuring Smooth Operation

[MikePhua]

The Bobcat 773 is a versatile and durable skid steer, well-regarded for its performance in construction, landscaping, and other heavy-duty applications. However, like all heavy equipment, it requires regular maintenance to keep it running smoothly and to avoid costly repairs. One of the critical components in the operation of the Bobcat 773 is the wheel bearing. Maintaining and replacing wheel bearings is essential for the overall performance of the machine, as they allow the wheels to rotate smoothly while supporting the weight of the equipment.
Importance of Wheel Bearings in Skid Steers
Wheel bearings are responsible for allowing the wheels of the skid steer to rotate smoothly and efficiently. They reduce friction between the moving parts, ensuring that the machine can operate at optimal speed and stability. If the wheel bearings become worn out or damaged, it can lead to uneven wheel rotation, excessive heat buildup, and ultimately, more severe mechanical failures.
Regular maintenance of the wheel bearings in the Bobcat 773 is crucial for extending the lifespan of the equipment, reducing downtime, and ensuring safety on the job site. It is also important to address any signs of bearing damage immediately, as neglecting these issues can result in costly repairs or even a complete failure of the wheel system.
Common Signs of Damaged or Worn Wheel Bearings
Recognizing the signs of a damaged wheel bearing early on can save time and money by preventing more serious issues. Here are some common symptoms of worn-out or damaged wheel bearings:

• Grinding or Roaring Noise: One of the first signs of a bad wheel bearing is a grinding or roaring sound coming from the wheels. This noise usually becomes louder as the machine accelerates, indicating that the bearing is not functioning properly.
  
• Excessive Play or Wobbling: If there is noticeable play or wobbling in the wheels, it could be a sign that the wheel bearing is loose or damaged. This can affect the stability of the machine and cause uneven wear on the tires.
  
• Vibration or Steering Issues: Damaged wheel bearings can also cause vibrations in the steering system. If you notice that the skid steer is difficult to control or the steering is unresponsive, it could be due to a failing bearing.
  
• Uneven Tire Wear: Worn-out bearings can cause uneven tire wear, particularly on the inside or outside edges of the tire. If the tires are not wearing evenly, it may be a sign that the bearings are not allowing the wheels to rotate properly.
  

Replacing the Wheel Bearings on the Bobcat 773
Replacing the wheel bearings on a Bobcat 773 is a task that requires proper tools and mechanical knowledge. Below is a general guide for replacing the wheel bearings:
1. Preparation and Safety
Before starting the replacement process, ensure that the skid steer is parked on a flat, level surface. Always engage the parking brake and use wheel chocks to prevent the machine from moving. Wear appropriate personal protective equipment (PPE), such as gloves, safety glasses, and steel-toed boots, to protect yourself from potential hazards.
2. Lift the Skid Steer
Use a hydraulic jack to lift the skid steer off the ground. Ensure that it is securely supported by jack stands before proceeding with the wheel removal.
3. Remove the Wheels
To access the wheel bearings, you must first remove the wheels. Use a lug wrench or impact wrench to remove the lug nuts, and take off the wheels. Keep the lug nuts in a safe place, as they will be needed to reattach the wheels.
4. Inspect the Hub
Once the wheels are removed, inspect the hub assembly to ensure that it is in good condition. Look for any signs of wear, rust, or corrosion that could have contributed to bearing damage. If the hub is damaged, it may need to be replaced as well.
5. Remove the Old Bearings
To remove the old bearings, you will need to use a bearing puller or a similar tool. Carefully remove the old bearings from the hub, making sure not to damage the surrounding components. Clean the bearing housing thoroughly before installing the new bearings.
6. Install New Bearings
Before installing the new bearings, apply a light coat of bearing grease to ensure smooth operation. Use the bearing installer tool to press the new bearings into place. Ensure that the bearings are seated properly and that they move freely without excessive resistance.
7. Reassemble the Wheel Assembly
Once the new bearings are installed, reassemble the wheel assembly by reversing the disassembly process. First, place the wheel hub back onto the axle, then carefully install the wheel back onto the hub. Tighten the lug nuts to the manufacturer’s recommended torque specifications.
8. Test the Skid Steer
Lower the skid steer back to the ground and perform a test run to ensure that the new bearings are functioning correctly. Listen for any unusual noises and check the stability of the machine. Make sure the steering and wheel rotation are smooth and free from any vibrations.
Maintenance Tips for Long-Lasting Wheel Bearings
To extend the life of the wheel bearings and avoid frequent replacements, follow these maintenance tips:

• Regular Lubrication: Keep the wheel bearings well-lubricated by applying grease regularly. This will reduce friction and prevent the bearings from wearing out prematurely.
  
• Inspect Bearings Periodically: Make it a habit to inspect the wheel bearings every few months or after heavy use. Look for signs of wear, rust, or damage that may indicate a need for replacement.
  
• Monitor Tire Pressure: Proper tire pressure is essential for preventing excess stress on the wheel bearings. Ensure that the tires are inflated to the manufacturer’s recommended pressure levels.
  
• Clean and Protect the Hubs: Regularly clean the wheel hubs to prevent the buildup of dirt, debris, or moisture, which can damage the bearings. Protect the hubs from rust and corrosion by keeping them clean and well-maintained.
  

Conclusion
Wheel bearings are a critical component in the performance and safety of the Bobcat 773 skid steer. Regular maintenance and timely replacement of the wheel bearings can prevent costly repairs and ensure the smooth operation of the machine. By following proper procedures for bearing replacement and keeping the equipment well-lubricated and inspected, operators can ensure a longer lifespan for their skid steer and minimize downtime on the job site.
Regularly checking the wheel bearings for signs of wear and damage is essential to maintaining the overall functionality of the Bobcat 773. When in doubt, always consult the machine’s manual or seek professional assistance to ensure proper installation and maintenance.