my 2002 3054 has the sight glass by your left foot as indicated and a red fill plug on top of transmission just behind the gear shifter. it also has a red plug behind the seat just above the top link this plug has a short J shaped hose on it that acts as a vent. the book says that the one on top of the transmission is the filler cap for transmission and hydraulics. depending on your model year it may be different, but you still can probably fill it from the back one. as long as you have oil in the sight level glass you are fine for level. also when checking oil level park on level ground lower all attachments to get accurat reading in sight glass.