Zetor FORTERRA HSX 120 Operator's Manual page 110

Display of values (engine revolutions) for automatic shifting of the multiplier
The values (number of engine revolutions) stored by the system for automatic shifting of the multiplier when
the buttons L and H are used are displayed on the corresponding main screen. More information in chapter
INSTRUMENT PANEL.
Example of use:
You are going on the tractor with the deactivated switch of multiplier preselection and with the multiplier
shifted to gear 2. At 1,600 rpm of the engine press the button L on the gear shift lever and thus the torque
multiplier is shifted to 1. Now increase the engine revolutions to 1,900 rpm and press the button H on the
gear shift lever and thus the torque multiplier is shifted back to 2. Continue going on the tractor. Now activate
the switch of multiplier preselection on the instrument panel. From this moment, automatic shifting is
performed by the system of the multiplier without the driver's intervention. The shifted gears of the multiplier
torque are as follows:
a - when engine revolutions drop below 1,600 ppm, the multiplier is automatically shifted to a lower gear
(travel speed decreases)
b - when engine revolutions increase above 1,900 ppm, the multiplier is automatically shifted to a higher gear
(travel speed increases)
The values 1,600 and 1,900 rpm of engine needed for automatic shifting of the multiplier used
in this example are purely indicative, in real the engine revolutions are adjusted by the driver
according to the specific use of the tractor.
If the switch of multiplier preselection is activated, the gears of the multiplier can also be shifted manually
using the buttons on the gear shift lever, but only within the range of set values (engine revolutions), i.e. in
the used example within the range of engine revolutions from 1,600 to 1,900 rpm; when the revolutions for
automatic shifting of the multiplier gear are reached, the multiplier is automatically shifted without the driver's
intervention. In this case (activated switch of multiplier preselection) the manual shifting of the multiplier
using the buttons on the gear shift lever do not influence the values (engine revolutions) which are saved in
the system for automatic shifting of the multiplier. After turning off the switch of multiplier preselection on the
instrument panel (the signal lamp on the switch is on), the gears of the multiplier can be shifted manually
only using the buttons on the gear shift lever.
Caution!
During travel of the tractor, when the switch of the multiplier preselection is switched off, the system for
automatic shifting of the multiplier continually reads values (engine revolutions) with every use of the buttons
H or L on the gear shift lever. After the switch of the multiplier preselection is switched on, the last read
values (engine revolutions) are used by the system for automatic shifting of the multiplier, i.e. the values read
during the last use of the buttons H or L on the gear shift lever with the deactivated switch of multiplier
preselection.
Recommendation
Before turning on the switch of multiplier preselection on the instrument panel while the tractor is in motion
perform manual shifting of the multiplier gear using the buttons H and L (once with the button H and once
with the button L) on the gear shift lever at the required engine revolutions. The values (engine revolutions)
are saved and when the switch of multiplier preselection is started again, shifting of the multiplier gears will
be performed automatically by the system for automatic shifting of the multiplier according to the engine
revolutions.
If the switch of multiplier preselection is activated, in the event of travel clutch release, e.g. while shifting
gears, stopping and subsequent starting of a tractor or while using reversal, a suitable multiplier gear is
adjusted by the system for automatic shifting of the multiplier automatically when the travel clutch is then
activated.
DRIVING OPERATION
109