GREAT PLAINS PL5700, Operator'S Manual

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PL5700 Planter Table of Contents Index Operation
Great Plains | 411-681M | 04/08/2021 34
If the tractor has marginal flow available, you may
need to experiment with combinations of fan flow
and baffle settings.
The fan requires up to 12.5 gal/min (47 liter/min).
This does not include oil for lift/lower or for marker
operation.
Unless the tractor has generous oil flow capacity,
raise/fold markers before lift, and lift slowly. Watch
meter pressure and tune operations to keep it at
planting levels in turns.
Fan speed can change as oil heats to operating
temperature. Check meter pressurization more often
during early operations.
Stop the fan by setting the tractor circuit to “Neutral”
or “Float”. The check valve slows the blades to a
stop by locally recirculating the oil.
Check valves provide a relief path for oil at motor
shutoff. If hydraulic hoses to the fan are reversed,
flow through this valve results in low fan rpm.
If a fan is connected in reverse, it may not run at all
due to no oil source at the return connection. If oil is
present, oil bypass at the check valve prevents the
fan from reaching operating rpms. A reversed fan is
not capable of providing enough air flow for planting.
If desired pressure cannot be reached, or requires
unusually high oil flow at low baffle settings, the fan
may be running backward. On bulk hopper planters,
if the rpm and meter pressurization readings are
correct, but the seed meters are not getting seed, the
fan may be running backward.
When a reversed fan is suspected, observe during
shutoff since the direction of the motor is easier to
see at lower rpms. Initial startup is instantaneous,
which makes observing at startup difficult.
If the fan is found to be running backward, reverse
the inlet/return lines at the fan.

Fan Adjustment
Verify the correct seed disks are installed (see seed
rate charts), and the seed inlet gates are set for the
seed to be used.
1. For planters with IntelliAg ISO6- With the fan off,
check the meter pressurization on the console.
Re-zero as needed. Refer to console operator
manual.
For planters with the PM300 - With the fan off,
observe the mechanical gauge.
2. Determine the recommended meter
pressurization. Refer to Material Rate manual.
3. Put the tractor in park and set the brakes.
4. Set the tractor engine speed to typical field rpm.
Lift the planter.
5. For bulk hopper planters - Start the seed delivery
fan. Check for meter fill:
With the fan running and the tractor in park
and/or the park brake set, remove several rain
covers from the seed meters, and check for seed
in the meters by looking through the disks. Check
rows with longer hoses and sharper hose bends.
If the fan is running and a meter runs out of seed,
back-pressure to the air box manifold may
prevent prompt refill. To fill a starved meter, close
the seed inlet gate for about 15 seconds, then
put it back to the original setting.
6. Start the meter operation fan. Gradually increase
fan rpm using the tractor hydraulic flow control for
the circuit.
7. Check that at least a small amount of pressure is
being sensed at the meters and meter
pressurization is near the suggested value.
The meter pressurization system cannot reach
full operating pressure when the hoses, meters,
and disks are completely empty. Low initial
pressures are normal.
8. Fill the meters.
a. For electric drive and hydraulic drive - run a
FILL DISK
operation.
b. For ground-drive planters - Rotate the ground
drive wheel to fill the meters. Meters are filled
when seed begins emerging below two or
more openers.
9. Check meter pressurization. With meters and
disks filled, meter pressurization should be at
target value.
If pressure is too low, open the main baffle or
increase fan speed.
If pressure is too high, reduce the fan speed or
close the baffle slightly.
10. Begin planting. Troubleshoot any obvious
problems or alarms.
11. After the first pass, take note of the average
populations reported on the console:
If the population is only slightly low, the problem
can be skips (periodic empty disk cells). If slightly