I replaced pins & bushing last year as a winter project. Its not too bad of a job , I marked all hoses & took pic's. Set bucket flat on shop floor, hooked up chain hoist to boom lift pin (empty hole showing on your Kx) Made a support ( 4x4 boom to floor) to help steady boom once pins ,hydraulics, light wire, are removed. Removed swing bracket from frame (make sure you have blade facing rear) I moved the swing bracket using a large floor jack its about 125 pounds large jack provides the reach needed.
I paid about $750 USD delivered from on-line Kubota dealer saving $500 over local dealer ( he would not match on line price) It does stop the movement & sometimes pop noise when digging.