New Holland CX720 Operator's Manual page 184

SECTION 2 – CONTROLS, INSTRUMENTS AND OPERATION
Message: "Calibration successful".
6. Stop the combine.
7. Press "enter" or "esc" to close the calibration
window.
Remark: If an error occurs while calibrating the tyre
radius, the calibration procedure will be aborted and
an error code will appear on the screen.
Error
60 The combine was driven the wrong distance
or to small/large tyres are installed
61 Ground speed sensor giving wrong signal
Possible cause Remedy
Drive the right distance (122m/400ft), make
sure approximate tyre radius is between 100
and 1500 mm
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