If it&#039;s a hydraulic lift it&#039;s probably a 4240 or 4340, most 100 Plowmasters were rooster comb lift. Go to Oliver Gangs web site and look at Chris Loseys posts and pictures. If the 3rd bottom turns over the wheel track of the land wheel it&#039;s a 4240, if the land wheel is beyond the cut of the 3rd bottom it&#039;s a 4340. Both do an exellent job. You can probably get manuals from the Floyd County Museum.