62
Preparing for operation
Adjusting the regula-
ting flap
The fan has two pressure gauges. One pressure gauge shows over-
pressure, the other shows negative pressure.
> Switch on the PTO stub shaft on the tractor. Whilst doing so, ensu-
re that the speed is correct for the machine.
On the back of the fan, there is a regulating flap for adjusting the ne-
gative pressure and a control for adjusting the ratio between overpres-
sure and negative pressure.
The pressure gauges can be turned so that their readings can still be
seen during the adjustment. Simply undo the wing screw.
> First adjust the regulating flap so that it covers both openings in the
fan
> Adjust the ratio between the overpressure and negative pressure
so that the appropriate values for your seed are achieved
If the appropriate values cannot be achieved by adjusting this ra-
tio:
> Make another adjustment on the regulating flap and then adjust the
ratio again
Pressure gauge
for negative
pressure
Pressure gauge
for overpressure
Regulating flap
Wing nut
Adjusting the ratio
between the over-
pressure and ne-
gative pressure
