I'm new to the Gravely word and I have a Commercial 430 and after a lot of time and patience I got it running.:tango_face_smile:. The problem I am having is the high and low gears well not shift. When the unit is off the lever well not go up or down. I have read the service manual but it was not helpful. I was hoping some one here could point me in the right direction. This is a Onan Engine Model # NB-MS/1847A.