1.180-00144 which is installed in the Hub of Travel reduction gear as below FIG 1.1, is O-ring with 329.56 mm. However, it tuned out that incorrect O-ring (81.6mm) is stocked in the Ansan.
1) It is necessary to change from 81.6mm to 329.56mm O-ring
2) K9008310(O-ring kit) included the 1.180-00144 is also required to change as a right one.
3) 81.6mm O-ring is considered as a disused parts. It must be removed.