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5.4 LIFTING
The lifting devices are very useful to adjust the height of the boom on the
basis of the height of the vegetation to be treated.
The height of the boom is adjusted as follows:
= the hydraulic version has a double-effect cylinder controlled by a special
parachute stop valve.
= to lift and lower the boom use the control on the elettroil pushbutton panel
or the quick-fit couplings connected to the lifting cylinder.
= periodically lubricate the sliding guides with grease and check the guide
bolts are tightened properly, with a suitable play.
5.5 DISTRUBUTION WITH HERBICIDE BOOM
5.5.1 DESCRIPTION OF TYPE OF JETS
Various types of jets are fitted; with a single fixed (threaded or quick-fit) or
with multiple heads.
Generally they have a non-drip diaphragm and are made out of reinforced
plastic, suitable for pressures up to 15-20 bar, some models are nickel plated
brass for pressures up to 40 bar. There are versions with 2-3-4 plastic nozzle
heads and 2 brass heads.
5.5.2 DESCRIPTION OF TYPE OF NOZZLES
The nozzles are extremely important to obtain a correct distribution on the
vegetation to be treated. Poor quality or worn nozzles have a tendency to
create unevenly treated strips.
The nozzles are produced in various sizes, to work with a precise pressure
range, to create certain types of larger or smaller drops; using nozzles for a
purpose they are not envisaged for prejudices the precision and duration of
the nozzles.
a)Fan nozzles
Available in various materials: plastic-brass-stainless steel-ceramic.
They are used at pressures from 1-5 bar producing medium-large drops;
particularly suitable for pre-emergency and post-emergency weeding.
b) Conical nozzles
Generally made of ceramics, these nozzles consist of two parts; the actual
nozzle and the slinger. They are particularly resistant to wear and designed to
work from 1 to 16 bar producing a high density of small drops with a strong
turbulence. This turbulence makes them suitable for penetrating luxuriant
vegetation and so they are suitable for fungicides and insecticides. When
necessary they can also support slightly higher pressures.
c) Anti-drift nozzles
There are various models of nozzles that make it possible to reduce the
effect of drift.
d)Mirror nozzles for liquid fertilizers.
5.5.3 DISTRUBUTION
a)Check that all the nozzles are in a good condition and are positioned
correctly on the boom. The automatic positioning with quick heads is done for
threaded heads with the relevant adjustment wrench.
Check that the total capacity of the nozzles is at least 25% less than the
capacity of the pump.
b)Make sure the suction and delivery filters, as well as the non-drip
membranes are clean and in a good condition and that the same quantity of
liquid is supplied along the entire width of the boom.
c) Check that the height of the boom from the crops is suitable for regular
distribution. For a boom with fan nozzles fitted at 50 cm from each other; this
height is roughly 50 cm.
d)Working pressure.
The working pressure must allow for the indications in points 5.5.2 and the
following of this handbook and also allow for the speed of the tractor to obtain
the desired spraying in litres/hectare.
To assess the data, consult tables N° 1-2.
These tables are valid for spaces between the nozzles of 50cm.
Sistema di Sollevamento ed Autolivellamento
Suggested
Nozzle-tips size pressure range
Min Max
XR 01-015 1 bar 2 bar
02-025 1,5 bar 3 bar
03 2 bar 3,5 bar
04-15 3 bar 5,5 bar
TurboTeejet all 1,5 bar 5 bar
AI-AIC all 2 bar 7 bar
TXA cone all 5 bar 15 bar