Great Plains CDA600 Operator Manual - Manual (Page 43)

41 Centurion CDA600
270-600M-ENG
2013-06-14
4.9 Fan General
Information
The hydraulic fan supplies the air stream
that carries materials from the meters,
through the primary hoses to the towers,
then to the secondary hoses to the rows.
The fan needs to be running in the correct
direction, and within a narrow speed range,
to reliably deliver material at your calibrated
rates.
Machine Damage Risk: Always
engage the fan with the tractor
at a low engine speed. Engaging
the fan when the tractor is at high
speed may cause fan damage.
Do not reverse hydraulic flow with the fan
running.
4.9.1 Fan Field Operation
With the tractor engine at low rpm, slowly
Extend the lever for the Fan circuit. Bring
the fan up to recommended speed (page
42). Let the fan warm up for 15 minutes
before planting.
Lower the drill 1.5 - 3m (5 to 10ft) before
planting is to begin. It takes a few seconds
for seed to travel from the meters to the
rows.
Leave the fan running during field turns.
Meter drive is shut off when the openers
are raised.
At the end of application, raise openers.
Stop material flow before shutting off the
fan.
Shut off the fan by carefully moving the Fan
circuit lever to Float. The fan does not stop
instantly. A check valve in the fan circuit
locally re-circulates oil until the blades
coast to a stop.
4. Adjustment / Operation
4.9.2 Fan Speed
The specific fan rpm required varies
considerably with drill configuration,
material density, application rate, field
speed and material properties. Develop
and record settings that are suitable for
your operations.
Always engage the fan with the tractor at a
low engine speed. Engaging the fan when
the tractor is at high speed may cause fan
damage. Do not reverse hydraulic flow with
the fan running.
At ideal fan speed:
• flow is more than high enough to avoid
blockages (from both meters on dual-
hopper drills),
• flow is even across all hoses from each
meter; and,
• flow is low enough to minimize seed
cracking and bounce.
Fan speed is monitored and reported by the
seed monitor, but is manually controlled.
If the fan cannot reach 3000 rpm, one or
more hoses may be mis-connected. Air
moves toward the air box in either rotation
direction, but reverse spinning airflow is too
low to operate the system.