What does this knob do?

[Garycw]

As the OP I can confirm that it's not the drop rate adjustment.

If it's the knob between center seat and floor then you got me.
That's where mine is on JD1025

 

[ozley]

There are 3 knobs shown in the picture I uploaded. From top to bottom: 1) This larger knob is used to set the weight of the operator. 2) This smaller knob is the knob in question. 3) This larger knob sets the drop speed of the 3-point.

I looked closely I can see the knob I have no idea. Does Anything happen when you turn it.

 

[Jabonee]

If you tractor is equipped with a AUX valve the knob is your slow return valve. It is an option.

 

[Uncle Hulka]

Thanks for your input, Jabonee, but I'm not sure I understand. By AUX valve, do you mean rear remote hydraulics? I have a remote, but that's it as far as options. Can you tell me more please?

 

[Ford850]

My tractor has a similar knob. On mine the triangle shaped knob is for the seat height adjustment. There is also a seat weight (or suspension) adjustment plus forward and back adjustment.

I think George2615 answered your question back at #6. It's in the base of the seat, and makes sense that it would limit the amount of seat travel.

 

[Jabonee]

I was looking through the service man. found a reference for it for removing the trans. I think its an option to control the flow of your rear aux. Did you buy this tractor new?

 

[Uncle Hulka]

After investigating, it looks as though the mystery has been solved. From what I can tell using trial and error, is appears that this knob sets the initial height of the seat itself. Allows a shorter, lightweight operator to position the seat lower.

I guess this effectively limits the seat travel.

Thanks to everyone who chimed in to help solve the puzzle!!!