Unhooking The Machine From The Tractor; Adapting The Cardan Shaft; Stability Of Planting Unit And Tractor During Transport - maschio BRAVA LARGE Gebrauch Und Wartung

ITALIANO ENGLISH

4.1.3 UNHOOKING THE MACHINE FROM THE TRACTOR

Unhooking the machine 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 machine it is ne-
cessary to proceed on a horizontal level.
1) Lower the supporting base elements
2) Slowly lower the implement 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.

4.2 ADAPTING THE CARDAN SHAFT

The Cardan shaft, supplied with the machine, is of standard
length. It might, therefore, be necessary to adapt the cardan
shaft. Should this be the case, before proceeding, consult
the Manufacturer.
CAUTION
- When the Cardan shaft is with drawn to the end of its
stroke, the two pipes should ovelap by at least 15 cm
(A fi g.15). When it is inserted all the way, the minimum
admissible play is 4 cm (B fi g.15).
- When using the equipment on another tractor, check
that conditions are as stated above and check that
the guards complete ly cover the rotating parts of the
Cardan shaft.
ATTENTION
For transportation of the machine, always follow the
Manufacturer's instructions.
A
A
B
B
fi g.15
52 - EN
USE AND MAINTENANCE
DANGER
cm 15 min
Max
cm 4 min
Min
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 trac-
tor). 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:
Z > [M x (s1+s2)]-(0.2 x T x i)
The symbols have the following meanings (please see fi g.16
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 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 du-
ring travel. Check that the tractor tyres are suitable for the load.
Z T
0,2 T
d i
fi g.16
(d+i)
s1 s2
s2 = xxx mm
cod. F07021035