Preliminary Analysis of Notes on Debugging of Excavator Slewing Bearings

We all know that when the excavator is working, it can twist left and right, front and rear mainly by the slewing mechanism in the machine, and the slewing bearing plays a vital role as an important part of the slewing mechanism. When assembling and overhauling and using and maintaining the excavator slewing bearing, the debugging of the slewing mechanism will be carried out, and the tightness of the assembly structure of the excavator slewing bearing requires us to master the correct operation method to avoid misadjustment. So what are the precautions for the debugging of the excavator slewing bearing?

The debugging of the excavator slewing bearing generally refers to the debugging of the backlash between the output gear of the slewing reducer and the ring gear of the slewing bearing. The proper adjustment of the inter-gear yard not only ensures that the pinion gear and the large gear do not gnaw and cut each other, but also ensures that the excavator rotates and brakes smoothly. Under normal circumstances, the eccentric distance between the center of the pinion and the installation and positioning center of the rotary reducer is used, and the center distance between the pinion and the large gear is changed by rotating the rotary reducer, thereby changing the tooth side clearance of the gnawing gear to debug the rotary mechanism.

Since the sway of the excavator’s slewing brake is caused by the slewing reducer, the operator often mistakenly thinks it is caused by too large backlash, so he tries to adjust the backlash by rotating the slewing reducer. After the rotary reducer rotated a screw hole position, it was found that the debugging results were not satisfactory, and then another screw hole position was rotated.

1. Before debugging the slewing bearing mechanism of the excavator, it is necessary to identify the gear teeth with large radial full runout of the pitch circle of the gear on the large gear and the direction of the midpoint of the pinion of the slewing reducer.

2. The slewing mechanism can only be debugged when the gear teeth on the pinion and the gear pitch circle on the big gear with full beating in the radial direction are engaged, that is, the slewing reducer can be rotated. There will be no interference between the gear and the big gear, and the big gear cannot be gnawed.

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