Have you checked all of the settings that control the three point hitch on the tractor??? You can set the rate of drop for different loads. If yours is set to a heavy load it will not drop with just the lift arms. You set this by raising the cover that is just in front of the three point control slide. There are two knobs under the cover. One limits the lift height the other sets the rate of drop. The engine has to be running as well.
If you do have the rate of drop set correctly then did this problem happen all at once or just over time?? I have ran into many 7000 series JD that the three point arms will not go down without weight on them IF the three point had not been used for a long time. The three point lift cylinders are a one way cylinder that have a seal ring and wiper setup. The seal rings can make the cylinders require more weight than just the lift arms. The cylinder ram is exposed when the three point hitch is all of the way up. Make sure the exposed part is not rusty. Then put a load on the three point, I often just hang a suit case weight on the lift arms. I then spray a good penetrating oil/lube around the cylinder ram. Then run the three point up and down while lubing it as you do this. Most of the time the cylinders will free up by just doing this. I have had to overhaul them if they still are moving hard.
If you are not going to be using the three point for a long time remove the lift links/arms and retract the lift cylinders. This way the chromed cylinder rams are not exposed to the elements.
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