The abnormal sound of slewing bearings

Cranes, excavators, wind turbine, bucket wheel machines, tunnel boring machines, circular clarifiers and many other engineering machinery will all use slewing bearings as the major bearing parts. And after a long-time work, slewing rings' abnormal sound will notice you that the bearing may has serious problem.

Below are some suggestions of confirming and solving the abnormal sound problem of slewing bearings:

1. New products have abnormal sound

If the new purchased slewing bearing has some soft sound during rotation before installation, rotate the bearing for a few minutes and the sound shall fade. If there is still abnormal sound, but the slewing ring's rotation is smooth, then it's probably caused by bearing's slightly deformation during transportation, and the sound will fade in a period of time after application, please rest assured to use.

If the new slewing ring has loud noise during rotatation and the sound does not fade in 2~4 months, please contact your supplier.

BRS-RIGIA bearing has started to exported slewing rings since 2010, and the after-sale problem is very few, we have consummate after-sale service system, will be responsible for our products to the end.

If the slewing bearing make an abnormal sound after installation, please check if the mounting surface is flat. Unqualified flatness may cause slewing ring raceway's negative clearance, which lead to the noise.

Solutions: Reprocessing the mounting surface or with the help of washer to achieve the standard flatness.

2. Slewing rings in service has abnormal sound

First of all, should confirm if the sound is made by slewing rings. Some noise made by steel structure or other components offten mistaken for the sound made by bearing. Therefore, we can determin the source of the sound after stop slewing ring's rotation, and keep other components working.

If it's the slewing rings' noise, below are several reasons:

a, The raceway is lack of grease, the rolling elements and the separators run into each other thus make the sound, a timely greasing will eliminate this problem.
b, Check if the raceway has some contaminants, such as sand, burr, etc., this situation often accompanied by difficult rotation (the working environment is generally terrible), meanwhile please notice if the sealing is damaged.

c, Check if the installation bolts are loose. Loose bolts will lead to elastic deformation of slewing bearings, and deformation position arise negative clearance.

If the above conditions are excluded, the slewing ring still has abnormal sound, please contact with your supplier.