The valve that you have is an 'isolating valve'. Without the valve, when you lift the quadrant lever oil is pumped to the lift cylinder to raise the 3-pt. With the ISO valve fitted by holding one lever back oil is pumped to the couplings mounted on the rear of the tractor. The 3-pt is held in place and will stay up subject to the condition of the system. If you do not already have them you will need two hyd hoses to reach the rear, two quick release couplings and clamps to mount the couplings usually on two of the axle housing bolts. Fitting the valve is straight forward. When you lift the cap off, if you have Pressure Control (unlikely on a 35) the tube will lift a little. If not the tube may come out with the cap. It will be necessary to 'fish' around a little to engage the bottom of the tube in the pump port. With the tube in place make sure the O ring on the face is present and carefully fit the valve over it. You may need longer 7/16 unc bolts. Connect up the pipes and couplings. Job done.
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