I have just gotten this machine going good and the selector valve froze in the down position it will turn just not come up, so before I tear into it I hope someone has an easier solution. I have a printout on this hoe and it shows a lot but it looks like there is a lot going on with this valve so it would be better to have some experienced person explain it some. This hoe is mounted on an 8n ford and seems to work fine it took some work, but it should be ready for sale soon. Thank . Ron