Need help rebuilding cutterbar on Krone disc mower

I have a 283s that has some bad spur gears in cutterbar. I have had alot of these Krone's and i always thought the right side had a end plate. To take off and slide gears out but i could not understand why the parts manual did not show a end plate. Now i am finding out all the gears have to come out of the bottom round hole under the cutterbar gearbox.

So first you pull big round plug under gearbox? Then you take  spur gear off of gearbox shaft and that lets you slide the rest of the gears out right? Or do i have to remove the cutterbar from the gearbox to slide gears out? Please tell me no because it will be easier to just leave disc mower hooked to tractor and rebuild it that way.

Please Help!

Need help rebuilding cutterbar on Krone disc mower