New Holland T4.75F Operator's Manual page 73

Speed calibration
If rear tyres of a different size are to be fitted, with a dif-
ference in radius of more than 13 mm (0.5 in) compared
to the standard ones, it will be necessary to recalibrate
the electronic control module so as to get the display of a
specific ground speed. For resetting, proceed as follows.
Select a dry, compact and level surface (preferably con-
crete) and measure out a section exactly 100 m (328.1 ft)
long. Mark the start and finish of this measured distance
with a bold chalk line.
Turn the ignition key onto the first click, holding down the
symbol (B) on the switch for more than three seconds.
• The central display shows "SETUP MENU" as in detail
(1). Release the symbol (B) to go to detail (2) (CAL).
• Press the symbol (B) on the switch and the display will
show "CAL READY", as in detail (3).
• Select a suitable gear and provide a speed above
2 km/h (1.2 mph) and at the start of the line drawn
beforehand, press the pushbutton and the display will
show "CAL ON" blinking, as in detail (4).
NOTE: The ground speed must not drop under 2
(1.2 mph). If the speed is less than as prescribed, cal-
ibration will stop.
• When the central portion of the front tyres passes over
the end line, press the button on the symbol (B) again
and the display will show "CAL OK" as in detail (5).
Now press the symbol (B) again to save the setting. If
on the contrary the procedure has not been performed
correctly the display will show "CAL NOT OK", as in
detail 6.
NOTE: If you want to stop the display, press the symbol
(A) on the switch. Press the same symbol again to exit
the programming menu.
3 - CONTROLS/INSTRUMENTS
km/h
3-35
6
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