sealing ring is so located as to permit removal of the bottom flange and lowering of the circle structure to replace all the bearing plates and a segmented upper oil seal without draining the lubricant chamber application_number US 88254178 A description referring first to fig1 of the drawings a motor grader indicated generally at 10 includes a longitudinal main frame 11 the front end 11a of which is supported upon a dirigible front wheel assembly 12 and the rear end of which constitutes a part of a traction chassis indicated generally at 13 on which is mounted a power plant indicated generally at 14 an operator 39 s cab indicated generally at 15 is on the rear portion of the main frame forward of the traction chassis a grader blade sub assembly indicated generally at 16 consists generally of a circle mounting bar indicated generally at 17 which in the illustrated apparatus is a draw bar a circle structure indicated generally at 18 and a grader blade and blade mounting indicated generally at 19 the circle draw bar 17 is best seen in fig2 to include a forward beam indicated generally at 20 and a rearward circle mounting indicated generally at 21 the forward part 22 of which is integral with the rear end of the beam 20 behind the part 22 of the mounting said mounting has a section 23 the depth of which is great enough that it forms a housing extending below the circle 18 the housing section 23 receives drive means indicated generally.