Implements - Grillo G131 Manuel D'utilisation

Translation of the original instructions

IMPLEMENTS

ROTARY TILLER
The rotary tiller is used to break the superficial layer of the ground in order to increase its
permeability and at the same time to get rid of weeds. Tillage must be effected at the lowest speed
if the ground is hard and tough, at a faster speed if it is soft and sandy. Tillage depth can be
regulated by moving the central knife under the rotary tiller body forward or backwards (fig. 25). To
increase the depth, move the knife upward. Start work with the knife in the lowest position and then
raise it if greater depth is required. N.B. If the machine jumps forward on very hard soils, the
central knife should be lowered completely by fixing it in the third hole. On normal or sandy soils
keep the knife in the central hole and use the outer toothed rod to adjust the working depth (no. 6,
fig. 2). Check that the knives have been fitted correctly (see fig. 8). Tillage width can be 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 (2.4") are
available (fig. 9). Independent drum brakes (fig. 10). For a good grip when using the plough, use
6.5/80-12 wheels or cage wheels like those shown in the picture (fig. 11). Two sets of the same
cage wheels can be used for tilling on steep slopes. For short transfers the little support wheel for
the rotary tiller is very useful (fig. 12). To tow the small trailer a strong tow 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 to achieve good results when ploughing (fig. 14).
PLOUGHS
The ploughs (fig. 15) 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 suitable for work on hillsides and for
vegetable growers; the depth of the furrow can range from 10 cm (4") through 20 cm (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. We do recommend not to plough a clay soil during
a drought because would remain cloddy, the machine would be strained and the operator himself
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:
6.5/80-12 wheels 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 cm (16.5"). The heavier the
machine the better when ploughing, so users should fit one pair 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 cm (1") above the
ground (fig. 15). Then check that the screws no. 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. 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
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