From JD website 2720 specs:
Fluid Capacities
Fuel Tank, gal. (l) 7.1 (27)
Cooling system (includes coolant bottle), qt. (l) 4 (3.85)
Crankcase with filter, qt. (l) 4 (3.6)
Transmission and Hydraulic System, gal. (l) gear ---
Transmission and Hydraulic System, gal. (l) hydrostatic 3.9 (14.6)
Front Axle Gearcase (MFWD axle), gal. (l) 0.9 (3.4)