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Reasons and solutions for inflexible operation of excavator slewing bearing

05-19, 2022 / in Bearing Knowledge / by LDB

The slewing bearing is an indispensable part of the excavator slewing device. Whether the excavator can turn left or right during work is inseparable from the credit of the slewing bearing. The slewing bearing is mainly used to support the quality of the upper body and bear the working load. Due to the heavy load operation of time and the influence of the environment, the phenomenon of inflexible operation will appear after a long time, which will cause a lot of trouble when we use it, and there is no way to work well.

Reasons for inflexible operation of excavator slewing bearing

Reason 1: The slewing bearing gear is deformed or broken, causing jamming or inflexible movement.

Solution: Repair the gear, re-weld the gear.

Reason 2: There is a problem with the sealing system of the slewing bearing, which will enter debris, such as stones, sand, etc., resulting in stuck or insensitive movement.

Solution: Clean up all the debris.

Reason 3: The newly purchased product is inflexible in idling. Check the production date of the slewing bearing. If the time is long and the climate is cold, it may be mixed with salt mist in the raceway, which will cause the rotation resistance to multiply and make the slewing bearing run poorly.

Remedy: If it can run after afterburning and there is no other abnormality, it can be used normally.

Reason 4: overload operation, resulting in inflexible movement of the slewing bearing.

Corresponding solution: The workload needs to be reduced.

Reason 5: The position of the slewing bearing is not flat.

Solution: Need to change the platform position and work in a flat position.

excavator slewing bearing

Reason 6: There is a lack of lubricating oil in the slewing bearing. The grease causes the friction to increase and the resistance to increase, which will cause the movement to be insensitive.

Solution: add lubricating oil of the same specification or replace all lubricating oil.

Reason 7: The operation of the excavator slewing bearing is not flexible. It may be that the installation surface of the main engine and the slewing bearing installation surface do not cooperate well, resulting in the axial clearance of the slewing bearing after installation cannot compensate for the deformation of the slewing bearing. Difficulty running in the raceway may sometimes be accompanied by abnormal noise, poor meshing of the large and small gears, or foreign objects stuck in the large and small gears.

excavator slewing bearing


① Re-process the installation plane of the host to make the installation plane meet the requirements; or use the gasket filling method to deal with it. 

②Re-adjust the meshing backlash of the large and small gears according to the requirements, especially pay attention to the position of the gear beating. 

③ Check to ensure that there is no foreign matter in the meshing position of the large and small gears. 

④ Replace a slewing bearing with a slightly larger clearance.

Reason 8: The sealing strip is damaged, causing foreign objects to enter the raceway, such as poor working conditions, and dust intrusion into the raceway.
Solution: Replace the sealing strip.
The above is the explanation of the reasons and solutions for the inflexible operation of the excavator slewing bearing. I hope it will be helpful to you.
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