Idiomas disponibles
Idiomas disponibles
4.3 STABILITY OF MACHINE AND TRACTOR DURING TRANSPORT
When a machine is coupled to a tractor, so becoming an integral part of it for the purposes of road travel, the stability of the 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
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 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.8
cod. F07011998
USE AND MAINTENANCE
Z > [M x (s1+s2)]-(0.2 x T x i)
Fig.8
Z
T
0,2 T
d
i
(d+i)
for reference):
S1
S2
ENGLISH
M
EN - 53
