hawk 1200h log loader.

I have a Hawk 1200h log loader. The turret bearing (allows the boom seat ect., to rotate 360*) seems to be loose. My old Prentice loaders had Timken bearings that were adjustable. I can't quite tell what kind of bearing set-up this one has. I have no manual. Does anyone have a picture of how this unit is put together? Is there any adjustment or do you just have to replace parts? If parts are needed, where would I get them? I think Barco took over Hawk in the 90's, but haven't seen any Barco dealers in my area (NH). Thanks! Don.