Hi Phil, there is a 3pt lift height adjustment in the I&T service manual but its is not very clear adjustment. My Dad/Brother's 684 had the same problem with a JD 3pt corn harvester. I believe the problem was a design problem. To give the larger 74/84 series tractors a greater 3pt lift capacity for heavy cat II equipment, the engineers connected the 3pt lift links out closer to the load points but with the larger wheel diameters on the larger 74/84 tractors they had to lengthen the lift links otherwise the 3pt would not lower enough for some in ground implements. Here is what we did, we took the lift links apart and there is a big hex nut that screws onto the upper lift link shaft. We screwed the nut further up the shaft but you have to be careful that the shaft end protruding the nut does not bind on the 3pt lift arm when it is lowered to the max. We actually cut about 3/4 inch off the bottom of the threaded part below the nut of the upper lift links to make the 3pt lift higher and also lower to the max without binding.
See caseih parts link. item 1 is the nut, thread on item 8 and 22.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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