Stability Of Planting Unit And Tractor During Transport - maschio BUFALO Gebrauch Und Wartung

4.3 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 or on the
rear of the tractor (depending on the front or rear hooking
to the tractor of the machine) 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 ; at least 60% by the rear
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:
In case of hooking behind the tractor (fi g.14):
Z > [M x (s1+s2)]-(0.2 x T x i)
In case of hooking in front of the tractor (fi g.15):
Z > [M x (s1+s2)]-(0.6 x T x i)
The symbols have the following meanings (please see
fi g.14-15 for reference):
M (Kg) Mass weighing on arms off hoist with full load (weight
+ mass, see cap. 1.3 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 (fi g.14) /rear (fi g.15) axle of
the tractor.
s1 (m) Horizontal distance between the inferior point of
attachment of the equipment and the rear (fi g.14)/
front (fi g.15) 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 ne-
cessary 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 gre-
ater stability during travel. Check that the tractor tyres are
suitable for the load.
cod. F07011320
USE AND MAINTENANCE
axle, and that the weight on
(d+i)
(d+i)
A
A
B
B
cm 4 min
fi g.13
REAR HITCH
ATTACCO POSTERIORE
Z T
0,2 T
d i
fi g.14
FRONT HITCH
ATTACCO FRONTALE
s2 s1
fi g.15
ENGLISH
cm 15 min
Max
Min
s1 s2
T
Z
0,6 T
i d
EN - 49