So looking at this image:
Obviously the upper arm is not a lift arm, the lower 2 are the lift arms, where it mounts on the tractor is just a pivot point, there is other arms that lift the lower arms, and the upper arms are connected to what I believe is called the rock shaft. The rear plate (#5), does that bolt directly to the rear, or is there space between it & the rear cover plate? What's special about the rock shaft? Is it a cast iron piece? Is there bearings at the ends of this shaft, bolted together or what?
Thanks