Gaspardo HL Serie Emploi Et Entretien page 33

3.1.2 UNHOOKING
Unhooking the hoeing machine from the tractor is a very dan-
gerous operation. Great caution must be used and the whole
operation must be carried out following the instructions.
For a correct unhooking operation of the hoeing machine it is
necessary to proceed on a horizontal level.
1) Lower the supporting base elements
2) Slowly lower the hoeing machine until it rests completely on
the ground.
3) Unhook the Cardan shaft from the tractor and put it on the
special hook.
4) Loosen and unhook the third point, following the fi rst and
second.
cod. G19500473
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USE AND MAINTENANCE
DANGER
3.2 STABILITY OF HOEING MASCHINE AND TRACTOR
DURING TRANSPORT
When a hoeing machine is coupled to a tractor, so becoming an
integral part of it for the purposes of road travel, the stability of the
hoeing machine-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. 10 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.
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 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
hoeing machine 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.

Z > [M x (s1+s2)]-(0.2 x T x i)
(d+i)
ENGLISH
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33