Excavator swing bearing repair

When it comes to repairing excavator slewing bearings, it’s a complex task that often requires specialized knowledge and tools. The slew bearing, also known as the slew ring or slewing wheel bearing, is a critical component that allows the excavator’s superstructure, including the body, cab and arms, to rotate.
The following is a more professional and detailed description for a more comprehensive understanding of the process:

1. Safe operation:

• Before repairing the excavator slewing bearing, make sure to perform the following safety steps:
• Park the excavator on firm, stable ground.
• Use appropriate personal protective equipment including helmets, gloves, safety boots and eye protection.
• Use hydraulic jacks or support legs to stabilize the superstructure to ensure safety during repairs.

2. Preparation:

• Remove hydraulic cylinders, arms, buckets, sticks and other components attached to the superstructure to gain access to the slew bearings.
• Disconnect all electrical and hydraulic connections.
• Remove covers, guards and exterior coverings that may obscure the slewing bearing.

3. Remove the slewing bearing:

• Disconnect the swing motor and remove the hydraulic lines.
• Remove gears and other accessories attached to the slew bearing.
• Carefully lift and remove the old slewing bearing using a crane or other appropriate equipment.

4. Check:

• Inspect the removed slewing bearing, paying special attention to wear or damage to the gear teeth, raceways and seals.
• If there are any problems, decide whether to repair or replace the entire slewing bearing.

5. Repair or replacement:

• If there is minor wear, repairs can be made, such as grinding, welding, or replacing worn parts.
• Severe damage may require replacement of the entire slewing bearing.
• Make sure new components meet the excavator’s specifications and the manufacturer’s recommended standards.

6. Install new slewing bearing:

• Carefully install the new or repaired slewing bearing back onto the excavator.
• Make sure the slew bearings are properly aligned and use a crane or other appropriate equipment to place them in the correct position.

7. Reassembly:

• Reinstall all removed components in reverse order, including gears, hydraulic pipes, swing motors, etc.
• Tighten all bolts and nuts using the manufacturer’s specifications and torque values.

8. Hydraulic system inspection:

• Reconnect the hydraulic lines and check for leaks.
• Before starting the excavator, perform a detailed inspection of the hydraulic system to ensure everything is operating properly.

9. Functional testing:

• Start the excavator and test the functionality of the slewing bearing.
• Ensure that the excavator’s upper structure can rotate smoothly and accurately.

10. Final inspection:

• Check the entire assembly to make sure all parts are installed correctly, bolted tight, and there are no abnormalities.
• Always be aware of any unusual noises or vibrations.
• Please note that this is a general guide only and specific steps may vary depending on the excavator model and manufacturer.
• When performing excavator slew bearing repairs, always refer to the excavator’s service manual and manufacturer’s guidelines.

To obtain more professional maintenance information, contact Fenghe slewing bearing technical support team.