I took my 80 out yesterday to disk a section of the property that had just gotten some dead trees removed. My disk has a single acting cylinder and I've pulled it with a 70, 70D, and the 60 numerous times and works great. It looks like I have to hook up two hoses (power up, power down) on the 80 vs. just the one hose like I've used on the other tractors. It easily raises the disk, but when you drop it, it has a squeal in the hyd. system while you've got the level in the lower position. I looked in the operators manual to see if there is an adjustment on the Powr-Trol and nothing is shown. Can I run a one way cylinder on the 80?