horsch Avatar 12.20 SW, Operating Instructions Manual

Page: 45 / 63

Pneumatic system
The pneumatic system consists of
•
Fan (seed wagon)
•
Hopper (seed wagon)
•
Metering units (seed wagon)
•
Distributor towers.
WARNING
Risk from hazardous dust (fertiliser, dressing).
¾
Always wear suitable protective clothing
(safety goggles, respiratory masks, protective
gloves) for cleaning and maintenance work.
Fan
¾
See operating instructions for the seed wagon.
CAUTION
Risk of burns on the fan drive
¾
Do not touch hydraulic components that have
become hot during operation.
NOTE
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.
NOTE
¾
Fan wing and protective grid must be regularly
checked for dirt deposits and cleaned.
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.
Fan speed
The fan speed required depends on several
factors:
•
Configuration of the pneumatic system
•
Design of the hopper
•
Travel speed
•
Properties and quantity of seed or fertiliser.
To achieve a rather uniform transverse distribu-
tion a rotary speed as high as possible should
generally be pursued. However, seed or fertiliser
must not be blown out of the system.
The table values therefore only serve as guide
values. The rotary speed actually required may
differ from the specification by up to 500 rpm.
NOTE
¾
The correct speed must always be determined
by field tests or during a test placement.
¾
Switch on the fan before starting to drill. Set
the required rotary speed as soon as driving
at working speed.
MF 41