Zetor PROXIMA POWER Z90 2012 Operator's Manual page 52

1600 and 1900 engine revolutions values necessary for automatic gear change of multiplier used in this example is purely
informative, in practice, the number of engine revolutions is set by a driver based on the specific use of a tractor.
With a pre-selection multiplier controller on, it is possible to change the gears of multiplier also manually by button on a gear lever
but only in the range of pre-set values (engine revolutions), i.e. in the used example in the range of engine revolutions between
1600 to 1900 revolutions/min, when reaching the saved revolutions for automatic gear change of multiplier gear, the gear is
automatically changed without a driver's intervention.
In this case (controller of pre-selection multiplier is on), manual gear change of multiplier by button on a gear lever does not influ-
ence the values (engine revolutions), which are saved in the system of automatic gear change of multiplier.
After turning off the controller of multiplier pre-selection on dashboard (control on controller is not lit), it is possible to change the
gears of multiplier of the twisting moment only manually by buttons on a gear lever.
Attention!
With taxiing when controller of multiplier pre-selection on dashboard is off, the system of automatic gear change of a mul-
tiplier keeps reading the values (engine revolutions) with every use of H or L buttons on a gear lever. After turning the
controller of multiplier pre-selection on, the system of automatic shift of multiplier uses the last read values (engine revolu-
tions), i.e. the values read with the last use of H and L button on a gear lever with controller of multiplier pre-selection off.
ACQUAINTANCE WITH THE TRACTOR
Example of utilization:
We are driving a tractor with a switched off controller of a multiplier pre-selection with
a multiplier shifted to M gear (one control light with a "turtle" symbol is lit), with 1600
revolutions/min of engine, we press L button on a gear lever, by this we shift multiplier
of twisting moment to L degree (two controls with "turtle" symbol are lit). Now we in-
crease the speed of tractor to 1900 revolutions/min of engine and we press H button
on a gear, by this we shift the multiplier of twisting moment back to M gear (one con-
trol with a "turtle" symbol is lit). We continue in the ride. Now we turn on the controller
of multiplier on dashboard. From this time on, the system of automatic gear change
shifts the gear of multiplier of twisting moment without any intervention of a driver in
the following way:
a - With decline of engine revolutions under 1600 revolutions/min, the multiplier
automatically changes to a lower gear (lowering taxiing speed)
b - When increasing the revolutions of engine above 1900 revolutions/min, the multi-
E216
plier automatically changes to a higher gear (increasing taxiing speed)
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