12
Quality for Professionals
6.2 Setting values (HG)
The blower fan produces an air current that carries the
seed through the hoses to the baffle plates. The required
air pressure and air quantity depend strongly on the seed
(type and weight), the spread rate, working width and
speed.
For this reason, it is not possible to give precise
specifications for the correct blower fan settings, it must
be determined in field trials!
A reference value can be found under 6.3.
CAUTION:
The air flow must never be too low, otherwise the seed gets stuck in the hoses
and causes blockage! This results in a lot of work, since the hoses must then be
disconnected and emptied manually. In addition, the seed might be ground in the metering
unit!
An excessive air flow can also have negative impacts on the seed distribution.
Guiding principle:
As much air as required, but as little air as possible!
The air quantity is limited by the utilised spreading material, which must not be damaged
when hitting the spreading plate and must also not bounce off too high in order to achieve
the desired placement!
The blower fan speed increases proportionally with the oil flow.
6.3 Setting procedure (HG)
Version 1
(constant pump – non-adjustable oil quantity)
•
Completely screw in the control valve (- minus)
•
Start up the blower fan (tractor engine speed as in field operation)
•
Adjust the blower fan speed using the control valve on the control block
•
The control block protects the motor against overspeed
TIP:
The hydraulic pump on the tractor must supply sufficient oil so that the blower fan
speed does not drop when the tractor motor speed drops or when other hydraulic functions
are actuated.
Version 2
(Variable pump or oil quantity adjustable on the tractor)
•
Completely turn out the control valve (+ plus)
•
Close the flow control valve on the tractor (set the oil quantity to
ZERO
)
•
Start up the blower fan and run up to the desired blower fan speed (slowly increase
the oil quantity)
Fig.: 12
