If the replacement of the new rotary bearings need to import, the price is expensive, about 100,000 yuan, the delivery cycle is relatively long. Excavator itself is the old machine, there is no need to replace the new slewing ring, it is decided to repair the original slewing ring. Due to the discovery of more timely problems, slewing ring, the outer raceway damage is not very serious. After observation and measurement, slewing bearing inner and outer raceway deformation, but the raceway has Ma point, can continue to use. So decided to replace the isolation sleeve, ball and seal repair methods.
The original slewing ball measured 28.48mm in diameter, while the domestic product can only buy a ball of 28.60mm in diameter, 0.12mm larger than the ball diameter of the original machine. The original rotary support a total of 136 sets of isolation sleeve and ball. The length of ball and spacer in the raceway is 16.32 (136 × 0.12) longer than before, and the size of each spacer should be reduced by 0.12mm to ensure that the spacer and the ball in the slewing ring are just filled with the raceway. When using the optional ball to buy, you must ensure that the ball diameter error is less than 0.002mm. Isolator also have to do more for the assembly of choice. If the final can not be guaranteed and the same as the original number, you should then reduce the size of some of the isolation sleeve until the original Slewing Ring and the same number of balls and filled the entire raceway so far.
