Gary, I use Hyd Fluid.
Book says to spin manual steering wheel rapidly but if this does not open the "Spool" use the Bucket to Raise the Front End off the Ground, and rapidly by Hand, deflect front wheels right & Left. This Should activate the spool valve
Check Pump level & Fill. Then repeat the steering
wheel spinning / manually moving the wheels Etc
until all the Air is out of the system
Hope This Helps,