clean the debris off it. and change the oil in it. if your transaxle is serviceable, change the filter too. if it is not serviceable, usually there is a vent hole on top that you can pour the oil out and then refill it thru the vent. this would of course require tha tyou remove it from the tractor.

THANK YOU !
i cleaned it off, it seemed to help.
i need to find out what kind of oil. M# 1692354 S# 56261