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Automatic multiplier shifting
The system of automatic multiplier shifting is switched by multiplier pre-selection switch. If the multiplier pre-
selection switch is on (control on the switch is lit), the gears of multiplier are shifted automatically depending
on the engine revolutions according to preset values (engine revolutions). The system of automatic multiplier
shifting is not dependent on the engaged speed gear. With engaged multiplier pre-selection switch, it is
possible to turn the engine off and start and the saved values (engine revolutions) do not change. The values
for automatic multiplier shifting are read always when the pre-selection switch is off, with tractor drive with
engine revolutions higher than 700 rpm, with travel speed higher than 2 km/h.
When meeting the previous conditions, the system will remember
a - Engine revolutions with last use of L button on gear shifting lever for automatic shifting of multiplier gears
for lowering the travel speed
b - Engine revolutions with last used of H button on gear shifting lever for automatic engagement of gears of
multiplier for increasing the travel speed
The difference between the engine revolutions for a and b must be greater than 250 rpm
Example of use:
We are driving with a tractor with multiplier pre-selection off with multiplier shifted to 2 gear, with engine
revolutions of 1,600 rpm we press L button on the gear shifting lever, by this we shift the torque multiplier to
1 gear, now we increase the engine revolutions to 1,900 rpm and we press H button on the gear shifting
lever, by this we shift the torque multiplier back to 2 gear. We continue driving with the tractor. Now we turn
on the multiplier pre-selection switch. From this time, the automatic multiplier gear shifting system shifts
gears of torque multiplier without any intervention of the driver in the following way:
a - With the drop of engine revolutions under 1,600 rpm automatically shifts the multiplier to lower gear
(lowering travel speed)
b - When increasing the engine revolutions above 1,900 rpm, the multiplier automatically shifts to a higher
gear (increasing the travel speed)
The values 1,600 and 1,900 engine revolutions necessary for automatic multiplier shifting used
in this example are purely informative, in practice the number of revolutions is set by the driver
according to the specific use of tractor.
With multiplier pre-selection on, it is possible to shift the multiplier gears also manually on a gear shifting
lever, but only within the range of set values (engine revolutions); i.e. in the example presented in the range
of revolutions from 1,600 to 1,900 rpm, when reaching the saved revolutions for automatic shift of multiplier
gear the multiplier is automatically shifted without driver´s intervention. In this case (multiplier pre-selection
switch on), manual shifting of multiplier by buttons on gear shifting lever does not influence the values
(engine revolutions) that are saved in the system of automatic multiplier shifting. After turning the multiplier
pre-selection on the dashboard off (the control on the switch is not lit) it is possible to shift the torque
multiplier gears only manually by buttons on gear shifting lever.
Beware!
With tractor travel, when the pre-selection multiplier switch on the dashboard is off, the system of automatic
multiplier selection keeps on reading the values (engine revolutions) with every use of H or L buttons use on
gear shifting lever. After switching the multiplier pre-selection switch, the system of automatic multiplier
shifting uses the last read value (engine revolutions) i.e. values read with last usage of H and L buttons on
the gear shifting lever with multiplier pre-selection off.
Recommendation
Before switching the switch of multiplier on the dashboard, do the manual shift of multiplier gear when using
H and L buttons (once by H button and once by L button) on gear shifting lever with requested engine
revolutions. The values (engine revolutions) will be saved and after subsequent engagement of the multiplier
pre-selection switch on dashboard, the system of automatic multiplier shifting will automatically shift multiplier
gears according to these engine revolutions
With multiplier pre-selection switch on, in case of release of travel clutch, for example with gear shifting,
stopping and subsequent dead start of tractor or while using reversing, the system of automatic shifting of
multiplier sets an applicable multiplier gear with subsequent switch of travel clutch.
DRIVING OPERATION
DRIVING OPERATION
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