JD990 Seat Suspension Adjustment

[JDNineNinety]

I have a JD990. On page 9 of my owner's manual there is a
section on adjusting the seat suspension. It says turn adjusting screw (A) clockwise to provide stiffer seat
suspension, etc. I cannot find a screw in that position.
Can anyone enlighten me on this? Thanks.

 

[zuiko]

It is under the seat towards the center in the front. It would be easiest to adjust while off the tractor.