 Your hydraulics should not be touchy if everything is connected properly and adjusted properly. 1st, are your hoses hooked up so that the implement is lowered with the forward movement of the lever, if not change them. 2nd, have the 90 degree fittings on the bottom of the valves been off for some reason? The rear fittings have a sleeve with a cross pin that retains a ball above the pin. If the fitting has been removed, the sleeve, pin and ball probably have fallen out. If they are not there, replace them. Without these parts you can adjust all day and it will not work. Refer to the scaned photo from the shop manual. There are three restrictors on your tractor. The one on the valve manifold controls flow to the detent valves, thus the rate of raise. The restrictor valves under the valves control the rate of drop. Loosen the lock nut and turn the screw all the way in until it seats (it will take quite a few turns to seat it) and turn back out 3/4 to one turn. With the oil warmed up run the engine at the speed you normally run it when raiseing and lowering the implement. Adjust the screw in or out to get a good steady rate of drop that is acceptable for your operation. The locking of the system is probably caused by the coupler end that you have on the hoses. The factory male ends for the hoses have a limiting pin that limits the travel of the valve to keep it centered. If you put on couplers on your hoses that do not have the limit pins, the valves in the male end will over travel and allow the female valve to close and lock the system. If you purchased male ends from a Farm Fleet type store you probably got the non limit type valve because of price. If memory serves me correctly, the good couplers are 7000 series and the non limit coupler is a 6000 series. If the coupler is off of the hose, you can shake it and hear the pin moving. If the lowering restrictors are adjusted properly, you should be able to get by with the non limit coupler. You may have to readjust for a change in load.
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