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3.1.2 UNHITCHING THE PLANTING UNIT FROM THE TRACTOR
Unhooking the seed drill from the tractor is a very dangerous
operation. This operation should be carried out with the tractor
engine switched off, the parking brake on and the equipment
resting on the ground. Great caution must be used and the
whole operation must be carried out following the instructions.
For a correct unhooking operation of the seed drill it is necessary
to proceed on a horizontal level.
1) Lower the supporting base elements
2) Slowly lower the seed drill until it rests completely on the
ground.
3) Disconnect the hydraulic pipes from the tractor distributors
and protect the quick couplings with the caps.
4) Unhook the Cardan shaft from the tractor and put it on the
special hook.
5) Loosen and unhook the third point, following the first and
second.
3.2 ADAPTING THE CARDAN SHAFT
The Cardan shaft, supplied with the machine, is of standard
length. Therefore it might be necessary to adapt the Cardan shaft.
In that case, before doing anything, consult the Manufacturer for
the eventual adaptation.
- When the Cardan shaft is pulled out as much as it can go, the
two pipes must be superimposed for at least 15 cm (A, Fig.
10). When it is inserted all the way , the minimum play allowed
must be 4 cm (B, Fig. 10).
- When using the equipment on another tractor, check what
has been set out in the previous paragraph and check that
the protections completely cover the rotating parts of the
Cardan shaft.
As far as the transport of the seeder is concerned, always
follow the Manufacturer's instructions.
A
B
48
PERICOLO
CAUTION
ATTENTION
USE AND MAINTENANCE
3.3 STABILITY OF PLANTING UNIT AND TRACTOR
DURING TRANSPORT
When a planting unit is coupled to a tractor, so becoming an
integral part of it for the purposes of road travel, the stability of the
planting unit-tractor complex may change and cause driving or
operating difficulties (rearing up or side-slipping of the tractor).
The condition of equilibrium can be restored by placing a sufficient
number of ballasts on the front of the tractor so that the weights
on the two tractor axles are distributed sufficiently evenly.
To work in safety the instructions given in the highway code should
be followed; these prescribe that at least 20% of the weight of the
tractor alone should be borne by the front axle and that the weight
on the arms of the hoist should not be more than 30% of the
weight of the tractor itself. These factors are summarized in the
following formulas:
The symbols have the following meanings (please see Fig. 11
for reference):
M (Kg) Mass weighing on arms off hoist with full load (weight +
mass, see cap. 1.4 Identification).
T (Kg) Mass of tractor.
Z (Kg) Total mass of ballast.
i
(m) Tractor wheelbase, that is, the horizontal distance
between the tractor axles.
d (m) Horizontal distance between the centre of gravity of the
ballast and the front axle of the tractor.
s1 (m) Horizontal distance between the inferior point of
attachment of the equipment and the posterior axle of
the tractor (equipment supported to the ground).
s2 (m) Horizontal distance between the barycentre of the
equipment and the inferior point of attachment of the
equipment (equipment supported to the ground).
The amount of ballast that should be applied according to the
formula is the minimum required for circulation on the road. If for
reasons of tractor performance or to improve the set-up of the
planting unit during operation it is thought necessary to raise
these values, please refer to the registration document of the
tractor to check its limits.
When the formula for calculating the ballast gives a negative
result it will not be necessary to add any weight. In any case, as
long as the limits of the tractor are respected, a suitable quantity
of weights may be applied in order to ensure greater stability
during travel. Check that the tractor tyres are suitable for the load.
fig. 10
fig. 11
g
Z > [M x (s1+s2)]-(0.2 x T x i)
(d+i)
cod. G19503100
1000 mm
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