The pneumatic system consists of
• Fan
• Hopper
• Metering unit
• Distributor towers.
Risk from hazardous dust (fertiliser, dressing).
¾ Always wear suitable protective clothing
(safety goggles, respiratory masks, protective
gloves) for cleaning and maintenance work.
The hydraulic fan is directly driven by the tractor
hydraulics.
The generated air ow conveys the seed from
the fall sluices to the coulters. The required air
quantity depends on seed (type and weight),
seed quantity, working width and sowing speed.
A correct fan speed cannot be specied and
must therefore be determined by tests in the
eld.
• The air ow should not be too high, so that
no seed or fertiliser will be blown out of the
seed furrow.
• However, the air ow must also not be too
weak, so that no seed or fertiliser will remain in
the hoses and cause blockage. The fan speed
should therefore be set as high as possible.
¾ Fan setting, seed transportation and seed
placement must be checked on all coulters
when starting sowing, and also at regular
intervals when working on large areas.
¾ Fan wing and protective grid must be regularly
checked for dirt deposits and cleaned.
Deposits on the protective grid restrict the air
ow and thus lead to blockage in the seed
pipes.
Deposits on the fan impeller cause unbalance.
The bearing will thereby be overloaded and
can be damaged.
To control the speed, the control unit in the trac-
tor must be equipped with a ow control valve.
Max. speed 4,500 rpm
Fan motor direct drive
Pressure gauge fan
42 43
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