Four steps to repair slewing ring
April 9, 2021Slewing bearing rotating platform
May 28, 2021
- Before the installation of the excavator slewing bearing, the upper and lower mounting surfaces of the slewing ring and the bearing should be checked first. In general, it is best to clean them to ensure that there are no different sundries (there will be local deformation of the slewing ring when the slewing bearing is installed, so that the slewing bearing is not smooth, abnormal noise and other situations occur).
- slewing bearing is composed of inner and outer ring, inner ring non-installation surface marked with “S” mark, here is the soft belt installation should be placed in the non-load area, non-regular load area or light load area; The outer ring is blocked at the outer circle, so is this position (because the soft belt and the blockage are not heat treated, its hardness is low, if often used in the load area, easy to make the slewing bearing raceway peeling off, and ultimately unable to operate).
- When the slewing bearing is placed horizontally on the installation support, check whether there is a gap between the slewing bearing and the excavator support with the feeler. If there is a gap, the corresponding iron sheet should be filled to prevent the deformation of the slewing ring after the bolt is tightened (if there is a gap, the tightening of the bolt will lead to the local deformation of the slewing ring, so that the operation of the slewing ring is not smooth, abnormal noise, etc.).
- Pre-tighten the bolts of the mounting bolts of the slewing ring first (it is not easy to adjust the size of the gear meshing backlash if it is tightened directly).
- Before tightening the bolts, it is necessary to make a mesh adjustment of the large and small gears, and ensure that the green paint part and the pinion meshing backlash are marked on the slewing bearing (suggested backlash size: 0.15-0.3mm for meshing backlash of 5-8 ton excavator gear; 9-15 ton class 0.20-0.4mm; 20-25 ton 0.3-0.6mm; 25 ton class 0.4-0.7mm; Under normal circumstances, different gear meshing backlash is selected according to the modulus of the gear, and the larger the gear is, the larger the backlash will be.
- Tighten the mounting bolts symmetrically in 180° direction (to ensure uniform force).
- After the completion of the installation should be cleaned up between the big and small gear, slewing bearing and around all debris; Raceway and tooth filling grease (recommended 2# extreme pressure lithium grease), slowly run the sleighing support for more than 3 laps, carefully check whether the operation is smooth, there is no abnormal sound, pause and the size of the gear meshing is normal, etc.
