Pneumatic system
The pneumatic system consists of one or two
optional fans, the solids pressure hoppers, the
metering units and pneumatic hose assembly.
WARNING
Danger from hazardous dust (fertiliser, dressing).
¾
Always wear suitable protective clothing
(safety goggles, respiratory masks, protective
gloves) for cleaning and maintenance work.
Fan
The hydraulic fan is directly driven by the tractor
hydraulics.
The generated air flow conveys the seed from
the fall sluices to the coulters. The required air
quantity depends on seed (type and weight),
seed quantity, working width of the attached
working machine and sowing speed.
A correct fan speed cannot be specified and
must therefore be determined by trials in the
field.
NOTE
The air flow must not be chosen too weak to
prevent the seed from remaining in the hoses
and blocking them. Too weak an air flow will also
have a negative effect on the seed distribution.
¾
Select the fan speed to be rather high.
¾
Fan setting, seed transport and seed place-
ment must be checked on all coulters when
starting sowing and also at regular intervals
when working on large areas.
¾
Check the fan impeller and the protective grid
regularly for dirt deposits and clean.
Deposits on the protective grid restrict the air
flow 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.
The fan speed is adjusted via the oil quantity on
the flow control valve in the tractor.
The hydraulic pump must deliver sufficient oil
to prevent the fan speed from dropping, even
when the tractor speed drops or other hydraulic
functions are activated.
The pressure gauge shows the pressure in the
hydraulic drive. The fan speed increases propor-
tionately with the hydraulic pressure. This should
be between 60 and max. 180 bar.
Above 180 bar the increase in speed is only
minor. The hydraulic motor may get damaged.
The maximum pressure in the leak oil line must
not exceed 5 bar.
Checks and maintenance
WARNING
Danger of serious injuries from the running fan.
¾
Dismantle the fan basket only when the
machine has been shut down and secured
against restarting.
The return flow pressure must not exceed 5 bar.
¾
Adjust the fan speed; a permanent pressure
of 180 bar shall not be exceeded.
¾
Clean the air intake grid at regular intervals to
prevent a restriction in air flow and resulting
blockage.
¾
Clean any dirt or deposits from the fan blades
to prevent unbalance and damage to impeller
and bearing.
¾
Retighten the clamping taper on the fan shaft.
Observe the
Fan flange
section in this regard.
Fan with direct drive
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