Unhooking The Seed Drill From The Tractor; Check The Lifting Capacity And Stability Of The Tractor To Which The Machine Is Hitched - GASPARDO S MARIA Serie Empleo Y Mantenimiento

ENGLISH

4.1.2 UNHOOKING THE SEED DRILL FROM THE TRACTOR

Unhooking the seed drill from the tractor is a very angerous
operation. 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) Lower the supporting base elements
2) Slowly lower the seed drill until it rests completely on the ground.
3) Disconnect the hydraulic pipes from the tractor distributors and
protect the quick couplings with the caps.
4) Loosen and unhook the third point, following the rst and se-
cond.
g. 405
Z
0,2 T
d
52 - EN
DANGER
T
i
USE AND MAINTENANCE
4.2 CHECK THE LIFTING CAPACITY AND
STABILITY OF THE TRACTOR TO WHICH THE
MACHINE IS HITCHED
When an equipment 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 dif culties (rearing up or side-slipping of the tractor).
The condition of equilibrium can be restored by placing a suf cient
number of ballasts on the front of the tractor so that the weights on
the two tractor axles are distributed suf 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:
Z > [M x (s1+s2)]-(0.2 x T x i) - M1 x (d2+i)
The symbols have the following meanings (please see Fig. 404
for reference):
M (Kg) Mass weighing on arms off hoist with full load (weight +
mass, see cap. 1.3 Identi cation).
M1(Kg) Mass of the front equipment.
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
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
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.
s1
(d1+i)
M
s2
s2 = 700 mm
cod. G19503221