Well I have done a few and you are close but here are a few tips. One you must cycle the steering to the stop and hold it against the stop for about a second so that the ram will partly extend. I don't know what way the ram is hooked up so it is up to you to figure what way to turn the wheel. Once extended then start filling but only part of the way to keep from getting too much air in the system. Keep extemding and filling but don't over fill too much because once you turn the wheel back there will be more fluid due to the amount that the shaft of the ram displaces. The key to it since you have nothing hooked up is turning all the way to the stops and giving the wheel a little extra so that you create pressure in the line.