My sister has a 647 tiller for her 1025R. The hitch pins that the dealer gave her are unusual, see below. They have a CAT0 and CAT1 diameters on the same pin. The brackets the pin fits in have a CAT1 hole on the outside and CAT0 on the inner portion. I assume it would allow the use of the tiller on CAT 0 and CAT1 3-point equipped tractors. The top link is set up the same way, but the top link pin has an additional hole that allows you position it it for CAT0 or CAT1. The hitch pin slides outboard when the tiller is raised and the CAT0 diameter portion interfaces with the CAT1 ball on the tractor. Anyone have a 647 and use it on a tractor with CAT1 3-point.