I know this is a easy question,but this is my first tractor and i dont have a manual yet. I need to check and fill the trans fluid. I found the dip stick for it under the seat. Im not sure if i have to check it with the engine running or not. Also were do i fill it up if low? There is a small capped cylinder with a line comeing out of it beside the dip stick. Is that the fill point? I just need to be sure.