Grillo G131 Manual De Uso Y Mantenimiento página 13

adjusted by varying the number of tines and regulating the cover width. When the tines are removed work on one
side first, leaving the others on; this will provide guidance and help to avoid common mistakes. To widen the wheel
track, besides the adjustable disks, wheels enlargements of 6 - 12 cms are available (fig. 9). Independent drum
brakes (fig. 10). For good grip when using the plough, use large tires or steel wheels like those shown in picture
11. Two sets of the same steel wheels can be used for tilling on steep slopes. For short transfers this little support
wheel for the rotary tiller is very useful (fig. 12). To tow the small trailer or the riding sulky, a strong towing bar is
available (fig. 13). To give the machine more adherence the wheel-weights of 36 kilos per pair (about 79 lbs) can
be fitted. They are strongly recommended for good results when ploughing (fig. 14).
PLOUGHS
The ploughs manufactured specifically for the 131 machine have been carefully designed to obtain good ploughing
without tiring the operator excessively. Two types of plough are available: single furrow and turn-wrest at 180°. The
latter is particularly advisable for work on hillsides and for vegetable growers; the depth of the furrow can range
from 10 cms (4") through 20 cms (8") depending on the soil. Practical hints for use of the ploughs: The soil must
be ploughed when suitably moist, 3 or 4 days after a heavy rainfall. It is not advisable to plough a clay soil during
a drought, for the machine, or the soil, which would remain cloddy, or for the operator himself who would be tired
out. On the other hand if you plough when the soil is neither too wet nor too dry, it will be easier to work and the
results will be much more satisfactory.
Preparation of the walking tractor:
Big tires should be used, and the track should be widened by turning the flanges of the disks properly to obtain an
internal width between the wheels of 42 cms (16.5"). The heavier the machine the better when ploughing, so users
should fit one or two pairs of wheel-weights, or fill the tire inner tubes with water (as suggested by tire
manufacturers). It is also possible to exchange the right wheel with the left and viceversa, so that the tire tread gives
a better adherence to the ground; check that the blade of the coulter and of the share are well sharpened. At this
point the plough can be attached directly to the flange of the machine; working depth can be adjusted by turning
the handle no. 1 until the rear section of the plough no. 2 is lifted 2 or 3 cms (1") above the ground (fig. 15). Then
check that the screws 3 are at least 1 cm (0.5") from the frame for attachments on each side. Now operate lever
no. 4 to set the plough slightly inclined as shown in picture 16 and work can start. Of course the first furrow will not
be very deep, while the second one (when one wheel is down in the furrow and therefore the plough is perfectly
vertical) will be very satisfactory. To adjust the furrow depth according to the soil, the handle no. 1 must be turned.
Remember that since ploughing is a typical towing job, when working on hard soils the differential lock should be
engaged; sometimes steel wheels are necessary, depending on the type of soil. When the plough is working well,
the rear section no. 2 must press strongly against the bottom of the furrow (fig. 17). This operation is essential for
the turn-wrest plough when one plough works differently from the other one. It may happen that at first the plough
is not smooth enough and the earth does not slide as it should; this problem is due to the slightly rough surface
of the moldboard and it will completely disappear as soon as the moldboard has acquired the typical sheen of steel.
Users are therefore recommended to clean the plough carefully when work is over and to grease the moldboard,
the share and coulter with old oil to keep the plough bright and ready to be used again.
ADJUSTABLE FURROWER
This implement has been specially designed for sowing and irrigation furrowing. It is attachable directly to the flange
of the machine situated in the rear part of the gearbox, in place of the rotary tiller. The position of the two wings can
be changed to vary the furrow width from a minimum of 10 cms (4") to a maximum of 30 cms (11.8"). Depth ranges
from 10 cms (4") to 20 cms (8"). In case of particularly hard soils till well before furrowing. The results obtainable can
be improved by attaching the tires 6.5/80-15 with widened disks or with wheel enlargements (fig. 18).
TOWED TRAILER
A very useful implement for small farming hauls. Its handiness, small size and quick applicability to the walking tractor
are its most outstanding features. The trailer can be attached directly to the walking tractor leaving the rotary tiller
on and connecting it by the specific towing bar (fig. 22). Maximum capacity: 400 kg on flat ground.
CUTTER BAR
The cutter bar attachable to the walking tractor 131 has a central control (fig. 19). Its toughness and high performance
make it the best piece of equipment for mowing quite large areas instead of a motor mower which would remain
unused for a long time, while the walking tractor can be used with many other implements.
The cutter bar must be attached to the frame for attachments of the walking tractor in place of the rotary tiller. The
handle must be turned by 180°, setting it on the engine side. Before turning the handle the four control rods must be
removed from their supports. Once the handle has been turned the two rods and the gear selector lever, furnished
with the cutter bar itself, must be fixed (see the instruction on fig. 3/B).
The most suitable speed for mowing is R2, that is "fast reverse".
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