I pulled my steering gear box to change the pitman arm, and when I got it back together and started the truck, the steering wheel moves back and forth on its own. I stopped the truck, topped off the fluid reservoir again and it kept doing it. I sat in the driveway idling turning the wheel lock to lock and it kept doing it after a few minutes. The lines are not switched. I checked that and they will only go one way.
Basically, if the wheel was straight it wouldn't move itself, but if I started it in one direction or the other it would keeping going by itself until it hit lock.
Does the system just need more time to purge itself?