Where's dip stock for hydroloc fluid on a Kubota L3400 4x4 tractor

As a rule the Kubota L2800/L3400 do not have a dip stick for the hydraulic fluid. To check the fluid level, find the small round site glass that is on the transmission, left side, just in front of the clutch pedal. This sight glass has a level line on it. If the level is low the fluid might not show in the sight glass. If the level is below the line add fluid. The fill port for the Hydraulic fluid is on the back of the tractor just below the level of the seat.