GREAT PLAINS PL5700, Operator'S Manual

Page: 42 / 150

Great Plains | 411-681M | 04/08/2021 35
PL5700 Planter Table of Contents Index Operation
high, the problem can be doubles (periodic cells
with double seed). A meter pressurization
adjustment may correct either condition.
If the reported population varies from the desired
population by a significant amount, do the
following:
a. Expose several seeds in each of several
rows, being careful not to move them.
b. Measure and average the distance between
seeds.
c. Compare the average to the predicted seed
spacing for the population in the Material
Rate manual.
d. Any instances of no seed where expected
may be a sign of skips. Two seeds at the
same place indicates doubles.
12. Resume planting. During the next pass, note the
following on the console screen:
 Minimum Row Population

Maximum Row Population
A small variation of population between rows is
normal. However, a row consistently running
lower or higher than the other rows, could
indicate a meter or seed sensor problem that
needs attention. See “ Seed Population
Troubleshooting ” on page 75.
When drive sprockets or electronic controls are set
correctly and the meter air pressure is adjusted to
the recommended setting, planted population on the
console should display very close to target with the
correct seed disks. If the reading is significantly
different, first check that the drive is set properly and
the console settings are correct for your seed disk
and row spacing. Verify that the speed displayed is
calibrated and matches the tractor reading. Verify
that meter pressure matches the chart.
Minor variations may be caused by skips or doubles
if all other causes are ruled out. This will affect the
overall planter and not just one or two rows. For
slightly low population, increase meter pressure to
eliminate excess skips. For slightly high population,
decrease meter pressure to eliminate excess
doubles.
After adjustment, always check the planting rate
following the procedure in the Material Rate manual
to verify correct operation.
Adjusting for Skips
If everything else is correct, and the overall average
population is running low, or there are gaps when
doing a furrow check, seeds may be falling out of
disk cells before delivery to the seed tube. Increase
meter pressurization to correct this.
Insufficient meter pressurization, or unusually rough
fields can increase the incidence of empty cells. Be
sure to rule out other causes, such as skipping
chains, meter starvation, or incorrect meter disks,
before adjusting meter pressurization to reduce
skips. Excess meter pressurization can increase the
chance of doubles.
Before adjusting meter pressure, first verify that the
drive is set, seeds per revolution is set, tires are
correctly inflated, and all mechanical settings are
correct.
Meter pressurization can be adjusted with
the planter in motion.
To increase meter pressurization:
1. Adjust hydraulic flow to meter pressure change.
2. Wait 5 to 10 seconds for the system to update
while you continue planting.
3. Continue making small adjustments until the
reported population levels out at the target value.
Adjusting for Doubles
If everything else is correct, and the overall average
population is running high, or there are double seeds
when doing a furrow check, the cause may be two
seeds in some disk cells at delivery to the seed tube.
Decrease meter pressurization to correct this
To decrease meter pressurization:
1. Adjust the tractor hydraulic flow.
2. Wait 5 to 10 seconds for the system to update
while you continue planting.
3. Continue making small adjustments until the
reported population levels out at the target value.
Fine-Tune Meter Pressurization
After several passes with satisfactory planter
operation, fine-tune meter pressurization. During
longer passes, with fewer distractions:
1. Observe the current overall average population
from the console.
2. Adjust the meter pressurization down in small
increments. Wait 5 to 10 seconds between
i