I just purchased a used L2900, and the label along side one control is missing. It is on the right side behind my right leg and just above the diff lock. It has one indentation to lock it in the down position. But what is it?
http://www.kubota.com/part/parts.aspx
Select 'Illustrated Parts List' --> check 'Accept terms and conditions' click open --> enter L2900 in box --> select your model and navigate to labels.
Does your tractor have draft control? If so, is there a second lever for the draft control next to the lift lever? If not, then it could be the on/off for the draft control?