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54
Operation
Mixed position and draft control
(Intermix)
When the lever (B - Fig. 38) is moved completely
forwards, the lift will operate in full draft control mode
while full position control mode is obtained by moving
the lever completely back. When the lever is set to
intermediate positions, the lift will operate in
Intermix
mode
, i.e. in mixed draft and position conditions.
The lever can assume as many positions as there is
space between the two ends of the sector. Its vicinity to
the front or rear part influences draft or position control
to a greater extent as shown in the examples.
The operator must therefore identify the best position
for the selector lever according to the type of soil being
worked, thus obtaining the best compromise between
draft variations and depth.
Work best carried out in mixed position and draft
control mode (Intermix)
(Fig. 41).
Ploughing
a) When working soils of strongly different types (sandy
zones mixed with clayey ones) where full draft control
could lead to excessive depth variations.
b) When shallow depths are required.
c) To achieve the best work conditions when semi-
mounted ploughs with several shares are used.
Work with other implements:
When draft control is required to a certain extent in
order to make the tractive force of the tractor more
regular. Even partial use of draft control mode leads to
work depth variations and it is thanks to these that the
tractive force of the tractor is kept at a more constant
level.
Floating position
This is used for implements that must simply rest on
the ground and follow its contours (e.g.: roller, seeder,
etc.). In this case, the lift links are completely free to
swing and the lift just lowers and raises the implement
at the beginning and end of the run.
(Fig. 38) Use of the lift in float mode is obtained by
setting the lever (B) fully back in the position control
setting and the link control lever (A) fully forwards. Just
use the control lever (A) to lift or lower the implement
.
Fig. 40
Lift in full draft control mode (selector lever
fully forwards). The work depth of the implement may
vary considerably depending on the consistency of
the soil (e.g.: zone 1 = normal soil, zone 2 = very hard
and compact soil)
, while the depth remains more or
less uniform when the types of soil are similar (zone 1),
either on the flat or with humps and hollows.
Fig. 41
Lift «Intermix»
mixed position and draft control
mode. The maximum and minimum work depths of the
implement are limited to the average work value (e.g.:
zone 1 = normal soil, zone 2 = very hard and compact
soil) since movement of the lever towards position
control mode has reduced the operating sensitivity of
draft control mode and has partially activated position
control.