Hi
There are one drain under the gearbox and the one under the pumpplate that you found,and it does take more like 25 LITERS not galons. Use a universal agri oil. It is more likely that the 3pt drops due to worn out seals in the lift ram then a litle water in the oil. Take a few minits and seartc the forum, there are meny posts on this.
Bjarne