Lift up the seat. The black screw cap is the filler port, the rubber tube that extends down from it is the dipstick.
Go to your John Deere dealer and pay big bucks for their hydrostatic fluid or go almost anywhere else and buy a good quality hydraulic fluid.
John Deere all-weather hydrostatic fluid or an equivalent type "F" automatic transmission fluid
2.25 qts per JD manual.
Under fan
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lift the seat and pull the dipstick while warmed up and running.
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Use any Automatic transmission fluid type F, or use John Deere low viscosity hydraulic fluid