Are you looking at a very early 1020 that had a separate open Center power steering pump and an open Center steering assist unit ?
this tractor has a Johndeere loader and looking at the pic's i thank it's a 8 piston pump. whith a closed center does it have the galley built into the clutch housing.
I bought all parts to change over my steering to power steering and started to install the parts and ran into a problem with the priority valve, the priority valve has two holes on the back side with o-rings. on the tractor the two holes are there but one has a ball bearing in it blocking the hole. How do I get the ball bearing out?chevgmc12 never stated he was adding """an open center""" priority valve similar to photo but you did state that. Open center hyd such as early 1020 didn't need a priority valve because that system utilized 2 hyd pumps similar to tractors built today.