In Reply to: 800 top cover adjustment same as in NAA document? posted by Larry Wyant on January 23, 2018 at 19:07:57:
Follow the "alternative Procedures" in the I & T FO-20 manual. No special tools required. If you run out of threads on the turnbuckle, replace the draft control fork.
Not familiar with the NAA document that you refer to but the NAA lift cover is not the same as that used on the 6789** tractors.