My Kubota L4310HST had a cylinder on each three-point hitch side link and a cylinder on the top link, giving it a total of 3. Then, I also had a hydraulic gauge wheel on an 8' blade, which upped the requirement to 4, so I installed electric diverter valves on two of the circuits, which gave me the ability to control 5 circuits. If I were doing it again today, I'd opt for 4 separate circuits, though most folks would rarely need more than 3. Normally, you would only need one sidelink cylinder (I found having one on both cylinders nice, but not worth the expense in money or circuits), one toplink cylinder, and one for a gauge wheel, hydraulic angle, power rake, etc. But, personally, I'd want the fourth one so I could have a gauge wheel on both ends of the blade. So, that's my vote: 3 for "normal" folks, 4 for folks obsessive/compulsive about hydraulics. /w3tcompact/icons/wink.gif