Gravely 252 large nut on foot rest for adjusting play?

[Trick1]

Not sure of the tolerance play on fore and aft of the front beam. If anyone knows and if the large nut is to take up slack or worn out bushings?

 

[mechanic mark]

http://apache.ariens.com/cgibin/ctrg0005?SESSIONID=0.8099047919707356&Site=GRAVELYS

enter model & serial numbers from your mower, service manual, english, electronic manual search.

Post complete model & serial numbers from data plate as well as year model.

http://apache.ariens.com/manuals/00250800_ENG.pdf

see adjustments, pages 17-24 this manual

 

[Trick1]

I pretty much exhaust my resources before posting a question, can't find anything about the large nut or if it is a adjustment point.