I bought my first Zero Turn Mower, its a Cub Cadet Z Force S 46 for $350. Boy was I in for an education! The mower only had power to one rear tire. I decided to change the trabnsmission fluid but quickly discovered there is no drain hole! So after watching many Youtube videos I decided to add my own drain holes. I chose a 1/4-20 by 1/2 inch bolt, with a metal washer and a rubber washer to make it watertight. I drilled a small hole then the hole size for the tap then tapped the holes. Changing the fluid did not fix the problem!
After watching many more videos I decided to see it the lever was being pulled to tell the transmission to move. It worked on one side but not the other. I chased the issue to a broken plastic part costing about $16.
