I have front plow on my IH434 tractor I made myself.
I don't use cylinders at all, but everything works off of my rear 3PH, by running a 1/2inch rebar under the tractor and under the engine to a swivel axle at the front and below the engine.
I have 2 uprights 2X4 tube steel, in front of my engine that extend downward just beside the rad on each side. In between these and about 8inches from the ground, I have a horizontal axle 24inches long, 3X3 tubing. It can move in a full arc as there is a 3/4inch rod in the center of it that passes through each vertical support. Welded to the center of the axle I have a 3ft beam of the same 3X3 tubing that extends to about 10 inches in front of my tires. This is welded at the center to my 78inch plow.
On the top of the axle I also have an 8inch long lever arm which my rebar rod can work back and forth to lift the plow.
The other end of the rebar is connected to a 1/4inch cam plate that can be pulled upward by my control arms, thus actuating the rebar rod. I can adjust how far to raise the plow, or how low to lower the plow by simply unscrewing a 1inch nut threaded to a 1in lift rod which has one end slotted to attach to the cam plate. I can even adjust it so the plow leaves a 2inch gap from the ground, handy for gravel driveways like mine.
I use it mainly for snow, but I've done landscaping with it too, and it can move quite a bit if earth.
The plow is made of a 24inch round by 36inch long , by 1/8inch plate compactor drum. I cut 3, 18inch wide strips from it, which welded togeather make up my 78Inches. I made a backup frame on the reverse side where the plow is connected. I could have made it an offset plow by making a quadrant of 1/2inch plate, and by extending the axle arm out a bit more for clearance from the tires.
If you want a pic and how to drawing, let me know.
Andy