Bleeding air out of tractor hydraulic cylinder procedure?

air will be trapped in a cylinder when it is new , or when lines are replace. The only method to clear it out is by a bleeder on the cyl (if it has one, unlikely), or to cycle the cylinder to full stroke and then allowing the system to rest. This is because air will become part of the whole system for a period and you want it to go to cavities in the tank wherre it will bubble up and go to the enviorment. So start the system, cycle the cylinders and shut the system down to allow the foamy oil to clear, then do it again until satisfied.