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3.5 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:
Z > [M x (s1+s2)]-(0.2 x T x i)
The symbols have the following meanings (please see Fig. 13
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.
Z
T
0,2 T
d
i
fig. 13
cod. G19502812
USE AND MAINTENANCE
(d+i)
s1
s2
s2 = 430 mm
g
3.6 TRANSPORT
If it becomes necessary to transport the machine for a long
distance, it can be loaded onto a railway wagon or a truck. For
this purpose, consult «Technical Data» for weight and specific
dimensions. The latter are very useful to check the possibility of
driving along all types of roads. The machine is generally supplied
in a horizontal position with no packing material. It is therefore
necessary to use a system of hoisting with a crane and cables,
or chains of adequate capacity, hooking onto the machine at the
hoisting points marked with the «hook» symbol (11, Fig. 4).
Before proceeding to the hoisting op- erations, make sure that
any any mo- bile elements of the machine are blocked. Make
sure to use a crane with an adequate hoisting capacity to lift
the machine. Hoist the machine with extreme caution and
transfer it slowly, without jerks or abrupt movements.
The operations of hoisting and trans- port can be very dangerous
if not carried out with the maximum caution; persons not directly
involved should be moved away. Clean, evacuate the area and
delimit the transfer zone. Check the state, condition and suit-
ability of the means at disposition. Do not touch suspended
loads, keep- ing them at a safe distance. It most be further
ascertained that the operational area is free of obstacles and
that there is sufficient «escape space», meaning an area which
is free and secure into which one could move rapidly in case a
load should fall. The surface on which the machine is to be
loaded must be horizontal in or- der to prevent possible shifting.
Once the machine is positioned on the vehicle, make sure that it
remains blocked in its position. Fasten the machine on the
platform of the vehicle by means of cables suitable for the mass
which must be blocked (see «Technical Data» for the weight).
The cables must be firmly fastened to the machine and pulled
taut to the anchorage point on the platform. Once transport has
been carried out and before freeing the machine from all its
fastenings, make sure that its state and position are such as not
to constitute danger. Remove the cables and proceed to
unloading with the same means and methods used for loading.
Transit and transporting on the public highways
When driving on the public roads, fit on the rear reflector triangles,
side lights and flashing beacon and always make sure that you
comply with the Highway Code and any other applicable
regulations. Make sure that the machine dimensions during
transfer phases allow for safe transport when travelling in
subways, along narrow roads, near electrical lines, etc.
The seed-drill must only be transported by road with the tanks and
hoppers empty and at max speed of 25 km/h. Before driving on to
the public roads with the machine hitched to the tractor, make
sure that the devices listed above and/or the slow vehicle signal
and/or the projecting load signal op- erate correctly. These indicators
must be affixed to the rear of the implement in a position where
they can be clearly seen by any other vehicle that drives up behind.
The tractor used for transporting the equipment must have the powers
shown in the Technical Data table; if necessary, redistribute the total
weights with the addition of ballasts to return balance and stability to
M
the whole assembly (Cap. 3.5). For displacements beyond the work
area, the equipment must be placed in the transportation position:
- Where provided for, make all the moving parts come within the
transport width, locking them with the safety devices (toolbars, row
marker arms, row marker discs, etc.).
- Road movements must be performed with all tanks empty.
- Any transport accessories must be provided with suitable signs
and guards.
ENGLISH
CAUTION
DANGER
ATTENTION
53
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