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3.2.7 UNHITCHING THE PLANTING UNIT FROM THE EQUIPMENT
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) Disconnect all the hydraulic and electric connections involved.
2) Slacken the belts using the handwheel (A Fig. 22), remove the guards (A, B Fig. 23) and take out the drive belts.
3) With the machine raised, insert the parking feet and attach the pin (B Fig. 24) to the hook.
4) Slowly lower the equipment.
5) The equipment can only be removed when it has been totally disengaged.
A
fi g. 22
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 diffi culties (rearing up or side-slipping of the tractor). The condition of
equilibrium can be restored by placing a suffi cient number of ballasts on the front of the tractor so that the weights on the two tractor
axles are distributed suffi ciently 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. 25
for reference).
M (Kg) Mass weighing on arms off hoist with full load (weight +
mass, see cap. 1.4 Identifi cation).
T (Kg) Mass of tractor.
Z (Kg) Total mass of ballast.
(m) Tractor wheelbase, that is, the horizontal distance between
i
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 attach-
ment of the equipment and the posterior axle of the tractor
(equipment supported to the ground).
s2 (m) Horizontal distance between the barycentre of the equip-
ment 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.
62 - EN
USE AND MAINTENANCE
DANGER
A
B
fi g. 23
Z > [M x (s1+s2)]-(0.2 x T x i)
(d+i)
fi g. 25
B
fi g. 24
1200 mm
cod. G19503231
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