1.4.2 –Filters
Besides the mentioned filter inside the top opening, the machine has other filters on the suction-
pump circuit and the pipes connecting the control unit to the nozzles.
The suction filter is on the pipes connecting the main tank to the pump and a special device allows
its dismantling even when the tank is full. Its function is to trap big particles that could arrive to the
pump, block the operation and increase the machine wear.
The filters on the fluid-carrying pipes (conducing to the nozzles) have a finer mesh; they trap those
particles suspended in fluid that could obstruct the nozzles and reduce the efficiency of the
nebulizing system.
THE FILTERS NEAR THE NOZZLES SHOULD HAVE A MESH PROPORTIONALTO
THE NOZZLE SIZES.
For filter cleaning and maintenance read the proper chapter.
1.4.3 –Pump
According to the models, it could be a piston-diaphragm pump or a piston-pump. It sucks fluid from
the tank (main or auxiliary tank according to the position of the adjusting valves) through the filter
mentioned and produces an internal pressure. The pressure supplied to the fluid is set either by the
position of the pressure regulator or the rotation rate of the pump. The piston-diaphragm pumps are
equipped with an air hydraulic compensator that reduces the variations in pressure due to the
alternating motion of the pump. The pump can be worked by the shaft connected to the tractor,
or by a cog belt (in some models).
For the pump maintenance, follow this manual and the pump use and maintenance manualenclosed.
1.4.4 –Control unit
It could be mounted either on the machine or a movable board placed near the driver’s seat. It can
be worked by a manual, mechanical or electric control (by special cables).
It receives the pressurized fluid from the pump and sends a part of it to the nebulizing group; the
liquid in excess is sent back to the tank. The pressure inside the nebulizing circuit can be
adjusted by a handle placed on the control unit. Special levers control the supply and side of
distribution (left-hand or right-hand side).
1.4.5 - Nozzles
They are mounted on the nebulizing unit. They produce a mechanical subdivision of the pressurized
liquid sent by the pump and nebulize it into fine drops. They usually are jetting nozzles and
produce a conical jet.
Near the nozzles are installed some anti-drip devices, that hinder the fluid from dripping when the
distribution is interrupted. The quantity of fluid expanded can vary according to the nozzle
dimensions.
1.4.6 - Fan
It produces a stream of air that helps the drops passing through vegetation. It is placed on the rear
side of the machine and is moved by a multiplier group connected to the P.T.O (power take off) of
the tractor. According to the models, the air suction occurs on the rear side (Athos, Drag series),
