Household Textile Products

whole quench hardening ship crane slewing bearing through strict inspection

?
Our Company can?design and manufacture other types of slewing bearings according to user’s needs, e.g. Single-row four-point contact ball series 01,Single-row crossed roller series 11,Double-row ball series 02,Tri-row pin roller series 13double-row ball slewing bearing, ball-pin combined slewing bearing, and light-weighted slewing bearing, etc.


?

Difficult turning of slewing bearing

?

Every slewing bearing goes through strict inspection and test run before being released from plant, so all of them are acceptable products. As the slewing bearing has pre-tightening force on its sealing face and frictional force of the sealing face should be overcome for turning, it’s normal that certain starting moment is needed when it is turned.

In case of clamping stagnation in turning, the following method should be taken to remove the trouble:

?

- - - -
? Case | ? Cause analysis | ? Troubleshooting methods |
Inflexible idling of new product | The slewing bearing has been stored for long time (e.g. over a half year) or the ambient temperature is low, which results in less liquidity of the grease inside, leading to inflexible operation. This case is prominent in cold regions and in winter. | After force is exerted, if it works well without any abnormal sound, it can serve for normal serve, but new grease should be filled until it is oozed from the seal. If operation is accompanied with any abnormal sound, check whether there is any damage caused during transport or storage and feedback the information to our after-sale service department for a solution. |
Inflexible operation after installation | The mounting surface of the main machine does not match well with that of the slewing bearing, resulting in that after installation, axial clearance of the slewing bearing can’t compensate for deformation of the slewing bearing, raceway of the slewing bearing is distorted, and the roller moves with difficulty in raceway (sometimes with abnormal sound). | ? Rework mounting surface of the main machine to make it in compliance with the requirements; or treat the surface by filling in plastic or partial washer. If flatness is still unacceptable after completion of surface treatment, try to exchange for a slewing bearing with larger clearance. |
Bad gear engagement is caused by failure to adjust gear backlash according to radial top point of gear pitch circle (three teeth marked with green paint). Deformation is caused by compressing the slewing bearing at the top point, resulting in difficult turning or abnormal sound. | Adjust gear and pinion engagement and gear backlash again as required. |
Impurities are jammed in the gear and pinion. | Check and be sure that gear and pinion engagement is free of impurities. |
Inflexible operation in use | The sealing strip is broken, resulting in entry of impurities into raceway. | ? Replace sealing strip or take effective sealing protection measures, e.g. installing guard plates. |
Failure to lubricate it with sufficient grease periodically according to the maintenance requirement, resulting in abnormal wear and tear of raceway. | Lubricate it with sufficient grease until grease is oozed out from the sealing strip. It’s noted that every oil cup should be oiled, and operation should be kept in oiling, if possible. If wear and tear is serious, the slewing bearing should be replaced. If you continue using it in short time, lubricate it with more amount of grease until grease overflows, so that the scrap iron is discharged as most as possible. |
Abnormal engagement between gear and pinion, with impurities or broken teeth | Remove impurities (if any); replace the slewing bearing, if there is any broken tooth. |
- - - -

?

?