Slewing Bearing Sealing Effect
The lubrication of the slewing bearing is accomplished by adding lubricating grease to the lubricating oil nozzle in the outer ring of the slewing bearing, and the lubrication of the rotary gear ring is done by the grease in advance. Slewing bearings have both inside and outside (or the upper and lower) rubber strips as oil seals, external oil seals fixed in the lower frame of the slewing bearing inner ring (fixed plate), Slewing Bearing used to prevent the outside dust debris into the slewing bearing. The inner oil Seal is located on the outer ring of the bearing (moving plate) to prevent the grease in the Rotary gear circle from entering the bearing. Rotary gear rings and slewing bearings Use the same brand of Grease.Oil SEAL, the rotary oil seal is gradually thinned out from the thickness, and finally forms a sharp angle, Slewing Bearing and only by the elasticity of the rubber itself by the deformation of the protruding angle of the rubber by pressing the end face of the slewing bearing. This kind of seal to prevent oil spill a little effect, but the pressure is not high, once the internal due to too much refueling or the work temperature to increase the pressure, the grease will still leak through the oil seal place. Slewing Bearing In normal circumstances, the leakage is related to the amount of filling, the working speed and frequency of the rotary part, and the temperature in the field. Therefore, there exists the ambiguity between normal and abnormal leakage.
In general, it is normal to have a small amount of oil spill in the outer oil seal under working conditions. The so-called normal, is refers to through the rotary bearing external seal leakage oil quantity and raises to the slewing bearing oil quantity roughly equal. However, when a large number of oil spills on the excavator abnormal phenomenon, it must be checked. Due to the particularity of the lubrication structure of the rotary part, Slewing Bearing it is necessary to analyze whether there is leakage and determine the problem in order to solve the problem finally.
The grease cycle of the rotary bearing cavity should be between 150~250h (the recommended maintenance period is 250h, but the actual work can be shortened according to the working intensity and frequency of the rotary part). If the raise is too frequent, it will lead to a large amount of oil leakage.
If the leakage of this situation, Slewing Bearing open the rotary gear lubrication grease inspection cover, will find that lubricating grease has become dilute. This thinning is the characteristic of mixing hydraulic oil or gear oil.
The outer oil seal should be relative fixed with the sealing groove of the exit frame. The key to the inspection is to observe the rotation of the excavator. Slewing Bearing If the oil seal also rotates at the same time when the equipment is rotated, the existing oil seal has been loosened in the sealing groove and the outer oil seal must be replaced. It is dangerous to adopt this method, so we should pay attention to safety, but this is one of the important methods to check whether the Rotary oil seal does play a role in sealing.
Open the rotary gear ring lubrication Grease Check lid, check the gear ring oil cavity whether there is a large amount of oil reduction, Slewing Bearing whether there is a seal broken fragments. If it is a large amount of grease, indicating that the grease has been omitted.