I thought I remembered it.
15, 16, and 18 in this picture....
- 15 is position control. That's how far DOWN the 3pt arms will drop. Wether you raise it manually or the draft control raises it, that's how far it will drop back down when you lower it or the draft control backs off.
- 18 is the raise response control. That sets how fast the 3pt hitch raises. Its gravity down, so it only controls raise speed.
- 16 is the draft control. Say you have a plow in the dirt set to plow 12" deep. Your plowing along in sand, which is easy, and you enter some tough clay. The rear wheel start to spin. The front of the tractor will start to raise ever-so-slightly. That changes the angle between the implement and the tractor. It decreases that angle. That would want to make the 3pt top link get shorter. It can't, of course, so it pushes against the rock shaft on the tractor, which is where the top-link connects to the tractor. The rock shaft controls the draft control valve. The amount of force on the top link opens and closes that valve by pushing on the rock shaft. The valve senses the push, activates a bit, and raises the 3pt hitch until the pushing force lessens. As it lessens, the valve activates in the opposite direction, and lets the 3pt hitch fall down until it gets back to the depth that you set with #15, the position control lever. Depending on how you have the raise response control #18 lever set, it can react slowly, violently, or anywhere in between.
Turn off the draft control.
Turn the raise response all the way down.
See if the 3pt hitch arms will lift.
Increase the setting on the raise response control and try to lift the 3pt hitch arms again. They should lift faster.
Increase it again and test. Should be faster yet.
Move it all the way to the most sensitive setting and test again.
If the draft control isn't marked, try those steps with the lever in the forward position. Then try those steps again with the lever in the rearward position.
Hope that helps.
