Hi Mad, was there and hydraulic oil in the filter housing when you changed the filter? Does the 574 have remote hydraulic outlets? Make sure the remote control valve has returned to the center off position. So 3pt will not go down even with engine off? The hydraulic system is an open center system, which means in the idle condition (no control valves being activated) the hydraulic oil is always circulating. For 3pt and draft control and remotes, the high pressure line is lower right line on MCV behind the filter, the return is the line above the high pressure line.
From Bernard le Mecano,3 pt will not go down:
There is a cover on the right side under the seat in front of the rock-shaft. Remove and check if the spool valve moves with the position lever. Make sure the draft control lever is down. It has a long spring, with a rod, maybe the spring is unhooked.
Hi, maybe the unload valve is stuck. Check with engine running, raise the hitch and at the same time pull the remote hydraulic lever. If the hitch raises, there is dirt in the unload valve. This valve is under the seat and you have to remove the large plug for access. One trick, loosen the large plug, unload valve about 2 turns and start the engine, the 3pt hitch should raise if the valve is stuck. It has a small hole in the valve and just blow the dirt out with air. Replace with new O rings.
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