8N Draft Control Questions

I have draft control questions for a neighbor who is using his 8N and rock rake to grade, level and smooth some loam.

1. How does the draft control lever work? when it is in vertical position, is the draft control lever off and vice-versa: when pushed forward or down (horizontal) is the draft control in operation?

2. When it is "on" I assume that it sort of keeps the rock rake in a leveling type of position, although the tractor may be riding up and down bumps or undulations...the rake should be lifting when it reaches a low spot and leveling or digging in when it reaches a high spot?

3. Just how does it work? Does it sense resistance when an implement is on a high spot, and "tells" the hydraulic lift to go up or down? How does it work with the lift (internally)...

Well, I certainly would appreciate the insights, and I would like to print the repsonses and pass it on to the fella. Thank yo uin advance. 9N'er

When the mode selector lever under the seat is in the down (draft) position the lift can be set to automatically raise and or lower the lift arms according to how much the implement is pulling on the tractor and thereby pushing in on the top link of the lift and the draft sencing spring and the linkage attached to the draft rod internally.

As the touch control handle is moved incrementally down the quadrant what is happening inside is that the control rod is being moved farther and farther away from the end of the draft sencing rod that is attached to the draft sencing spring on the back of the tractor thus making it take more pressure on the spring to depress it far enough to make contact with the control rod which in turn is moving the contol valve to lift the implement. Thus you can adjust the touch control handle on the quadrant to automatically hold the pull on the tractor at a constant draft.(Pull on the tractor).

The constant draft is used mostly for ground contact implements such as turning plows and cultivators where the implement is engaged in the ground. This draft control was and is the Genius of the modern tractor and was first invented by Harry Ferguson as was incorporated in the 9N Ford tractor by Henry Ford. Two great minds met and the rest is history.